JP4113306B2 - DIGITAL DATA RECORDING DEVICE AND METHOD, AND COMPUTER-READABLE RECORDING MEDIUM CONTAINING THE PROGRAM - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital data recording apparatus and method for protecting the copyright of digital data, and a computer-readable recording medium.
[0002]
[Prior art]
With the spread of the Internet in recent years, so-called EC (Electronic Commerce) that uses PCs (personal computers) to download favorite music data, etc. from the homepage, and pays through payment methods such as credit cards. The music distribution by is spreading. The spread of EC music distribution via the Internet (hereinafter referred to as “electronic music distribution”) means that users do not have to go to record stores, and music based on the current CD (Compact Disc). It has the potential to significantly change distribution.
[0003]
By the way, paying attention to the style of listening to music, in addition to watching at home, there are also many styles of watching on the way to work, commuting to school, or in the car, using a portable playback device Occupy a proportion. In this case, it is necessary to record music data on a portable medium such as MD (Mini Disc).
In electronic music distribution, each company adopts its own encryption method to protect copyright. In other words, different encryption methods are employed depending on the production company, distribution channel, usage pattern, and the like.
[0004]
[Problems to be solved by the invention]
In such a situation, when music data is recorded on an MD or the like by electronic music distribution, when the music data at the distribution stage is recorded as it is, a playback device that reproduces the MD or the like decrypts the data corresponding to each encryption method. A device that can be used is required. As a result, the scale of the apparatus increases, resulting in an increase in price, which is disadvantageous for the user.
[0005]
On the other hand, if only the user's profit is considered, if the encryption of the music data distributed electronically is decrypted and recorded in the MD or the like, the playback device can provide an inexpensive one because it does not require decryption. become. However, in this case, copyright protection cannot be achieved by promoting unauthorized copying.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, a digital data recording apparatus capable of protecting copyright, and capable of reproducing music data recorded on a recording medium with an inexpensive digital data reproducing apparatus, and a method therefor, An object is to provide a computer-readable recording medium.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a digital data recording apparatus for recording digital data on a recording medium, a communication means for receiving encrypted digital data via a digital network, and the communication means. A decrypting means for decrypting the encrypted digital data, and a plurality of encrypting sections, the encrypting sections encrypting the digital data with one of encryption schemes each having a different security level; A recording means for recording the digital data encrypted by the encryption means on the recording medium; and a control means for controlling the decryption means and the encryption means. One of the encryption units re-encrypts the digital data decrypted by the decrypting means.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a digital data recording apparatus according to the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 is a configuration diagram of Embodiment 1 of a digital data recording apparatus according to the present invention. The digital data recording apparatus includes a data transmission / reception unit 100, a reception unit 101, a primary recording medium 102, a data extraction unit 103, a determination unit 104, a decryption unit group 105, an encryption method instruction unit 109, an encryption method, And a secondary recording medium 114, a recording unit 115, a unique information acquisition unit 116, an instruction receiving unit 117, and a charging unit 118.
[0008]
The digital data recording apparatus other than the secondary recording medium 114 and the recording unit 115 is generally realized by a PC (personal computer) 201 as shown in FIG. 2, and the recording unit 115 is, for example, a DVD (Digital Versatile Disc). In the RAM drive 202, the secondary recording medium 114 is realized by the DVD-RAM disc 203, respectively.
[0009]
This digital data recording apparatus receives music data, which is encrypted digital data distributed via the Internet, downloads it to the primary recording medium 102, then decrypts the digital data with a decoding unit group 105, and encrypts it. The data is recorded on the secondary recording medium 114 by the recording unit 115 as the digital data encrypted again by the converting unit group 110.
[0010]
In this embodiment, although electronic music distribution is described, the type of digital data is not limited to music data, and may be video data, character data, or a combination thereof.
The data transmission / reception unit 100 is a communication unit realized by a modem and control software, and is connected to a host computer (not shown) of an information provider through a telephone line. When the purchase request for the desired song received by the receiving unit 101 is notified via the data extracting unit 103, the request is transmitted to the host computer. Music data distributed according to a purchase request from a host computer is downloaded via the Internet and recorded on the primary recording medium 102. Also, billing information generated when the music is purchased is transmitted to the host computer.
[0011]
Here, information provided by the information provider will be described. The information provider has established a music sales site, that is, a company homepage, and provides information necessary for the purchase of the user such as a song name and a price, or information that motivates the purchase. The user purchases a favorite song based on the information provided by these information providers. FIG. 3 shows an example of information provided by the information provider, that is, a homepage for selling music. The displayed information includes contents such as a song title 301, a singer name 302, a recording time 303, and a price 304. Here, the song name 301 and the singer name 302 are information representing the song name and singer name of the individual music data, respectively. The recording time 303 indicates the recording time (reproduction time) of each song, and the price 304 indicates the selling price of each song. Based on these pieces of information, the user can select a favorite song through the reception unit 101 and notify a purchase request. Of course, as shown in FIG. 3, the information provided by the information provider is not limited to character information, but may be an image such as a jacket picture or music data for trial listening.
[0012]
The receiving unit 101 includes a keyboard, a mouse, and the like, and receives a purchase request for music data from a user who viewed the information shown in FIG. 3 displayed on the display screen of the PC. The received music purchase request is notified to the data transmission / reception unit 100 via the data extraction unit 103.
The primary recording medium 102 is generally realized by a PC hard disk or the like, and stores music data that is encrypted digital data received by the data transmitting / receiving unit 100. Further, when the downloaded music data is recorded on the secondary recording medium 114 by the charging unit 118, for example, encrypted charging data is recorded in the secure area of the primary recording medium.
[0013]
FIG. 4 shows an example of the data structure of downloaded music data stored in the primary recording medium 102, that is, music data provided by the information provider. The music data provided by the information provider is mainly composed of attribute information 401 that is information such as the song name, singer name, and price of the music data, and a song data portion 402 that is the music data itself.
[0014]
The attribute information 401 includes ISRC information 403, song name 404, singer name 405, price 406, information provider name 407, and encryption format 408. Hereinafter, the attribute information will be described.
ISRC (International Standard Recording Code) information 403 is unique information assigned to each music data, and includes country code (2 ASCII characters), owner code (3 ASCII characters), recording year (2 digits), It consists of a serial number (5 digits). The song name 404 and the singer name 405 are character information representing the song name and singer name of the music data, respectively. The price 406 is information representing the price of music data. In the present embodiment, the amount charged when the downloaded music data is recorded on the secondary recording medium using the digital data recording device is shown.
[0015]
The information provider name 407 is information indicating a music data provider name or a copyright owner name. That is, it is information indicating to which vendor the user should be charged when music data is recorded using the digital data recording apparatus, and the amount of money should be distributed.
The encryption format 408 is information indicating in which encryption format the downloaded music data is encrypted. That is, the music data is encrypted with different encryption methods for each information provider. For example, when the information provider A, the information provider B, and the information provider C provide music data, the music data provided by the information provider A is encrypted by the A method and provided by the information provider B. The music data is encrypted by the B method, and the music data provided by the information provider C is encrypted by the C method. In this embodiment, when the information provided by the information provider is encrypted in various formats, the secondary recording medium 114 on which the information is recorded is protected by the playback device while protecting the copyright. The main purpose of the invention is to convert it into an easily decipherable encryption format, and a detailed description of the encryption algorithm is omitted.
[0016]
Further, in the attribute information 401, the price 406 and the information provider name 407 are encrypted as necessary because the information provider may be disadvantaged if falsified.
Upon receiving the digital data extraction instruction from the encryption method instruction unit 109, the data extraction unit 103 first extracts the attribute information 401 from the primary recording medium 102 and notifies the charging unit 118 of the attribute information 401. Further, the information of the encryption format 408 in the attribute information 401 is notified to the determination unit 104. In addition, when the price 406 or the like is encrypted in the attribute information 401, the decrypting unit group 105 decrypts the price and then notifies the charging unit 118 of the decrypted information. Further, the music data part 402 is taken out from the primary recording medium 102 and outputted to the determination part 104. As described above, the data extracted by the data extraction unit 103 is encrypted with different encryption methods for each information provider.
[0017]
The determination unit 104 determines which decryption unit in the decryption unit group 105 is to output the music data based on the information of the encryption format 408 notified from the data extraction unit 103.
The decryption unit group 105 includes n decryption units, the first decryption unit 106 decrypts the digital data encrypted by the A method, and the second decryption unit 107 encrypts by the B method. The n-th decryption unit 108 decrypts the digital data encrypted by the N method. Each decryption unit 106 to 108 is composed of a decryption module for each information provider.
[0018]
For example, if the information of the encryption format 408 notified to the determination unit 104 is the B format, the determination unit 104 outputs the digital data of the music data portion 402 of the music data to the second decryption unit 107 and decrypts it. The second decryption unit 107 decrypts the input digital data and outputs the decrypted digital data to the encryption method instruction unit 109.
When decrypting data encrypted by any of the first to n-th decryption units 106 to 108, if a decryption key is necessary, the data transmitting / receiving unit 100 obtains a decryption key corresponding to the data encryption method, Decrypt the data. In this way, with respect to data encrypted by different encryption methods for each information provider, the data once encrypted by each method is decrypted.
[0019]
When receiving an instruction for the type of encryption method from the instruction receiving unit 117, the encryption method instruction unit 109 instructs the specific information acquisition unit 116 to acquire specific information according to the instruction. When the notification of the specific information instructed from the specific information acquisition unit 116 is received, the data extraction unit 103 is instructed to extract music data. When the notification that the specific information according to the instruction cannot be acquired is received from the specific information acquisition unit 116, the display unit (not shown) displays that the encryption method instructed cannot be encrypted. When the instruction receiving unit 117 has not received an instruction for the type of encryption method, the specific information acquiring unit 116 is instructed to acquire specific information according to the attribute of the secondary recording medium 114. When notified from the unique information acquisition unit 116 that unique information or unique information cannot be acquired, the data extraction unit 103 is instructed to extract music data. A random number is generated when a notification that the unique information cannot be acquired is received.
[0020]
When the encryption method instruction unit 109 receives an instruction of the encryption method from the instruction reception unit 117, the encryption method instruction unit 109 selects one encryption unit corresponding to the instruction, and selects any one of the decryption units 106 of the decryption unit group 105, When the decoded digital data is received from 107,..., 108, the decoded digital data is notified together with the unique information notified from the unique information acquisition unit 116.
[0021]
In addition, when the instruction receiving unit 117 has not received an instruction, the encryption method instruction unit 109 selects one encryption unit according to the type of unique information notified from the unique information acquisition unit 116, and When receiving the input of the decoded digital data from any of the decoding units 106 to 108, the digital data is notified together with the unique information. When the notification that the unique information cannot be acquired is received from the unique information acquisition unit 116, the digital data is notified to one encryption unit together with the generated random number.
[0022]
The encryption unit group 110 includes n encryption units 111, 112,. Each of the encryption units 111, 112,..., 113 encrypts the notified digital data with different types of encryption keys. For example, the first encryption unit 111 encrypts with the encryption key created based on the unique identification information of the secondary recording medium 114. The second encryption unit 112 encrypts with the encryption key created based on the unique identification information of the playback device (not shown) that plays back the secondary recording medium 114. The nth encryption unit 113 encrypts with an encryption key created based on a random number. The data size of each encryption key used in the encryption units 111 to 113 is set smaller than the data size of the encryption key of the encrypted digital data stored in the primary recording medium 102.
[0023]
A small data size of the encryption key of the encrypted digital data recorded on the secondary recording medium 114 means that the difficulty in decrypting the digital data is low. Therefore, the configuration required for decoding the digital data in the playback device that plays back the secondary recording medium 114 is simplified, leading to cost reduction of the playback device.
[0024]
For example, when there is no instruction from the instruction receiving unit 117 and the encryption method instruction unit 109 receives notification of identification information of the secondary recording medium from the unique information acquisition unit 116, the secondary encryption is sent to the first encryption unit 111. Notify the identification information of the recording medium. The first encryption unit 111 creates an encryption key based on the identification information, rewrites the encryption format 408 of the music data attribute information 401 notified from the encryption method instruction unit 109, and generates the song data unit 402. Encrypt with the specified encryption key. The encrypted digital data is notified to the recording unit 115.
[0025]
In addition, when the encryption method instruction unit 109 receives an instruction for encryption based on unique information of a reproduction device (not shown) that reproduces the secondary recording medium 114 from the instruction reception unit 117, the encryption method instruction unit 109 instructs the unique information acquisition unit 116 of the reproduction device. Instructs to obtain unique identification information. When the identification information unique to the playback device is notified from the unique information acquisition unit 116, the identification information and the decrypted digital data notified from the decryption unit group 105 are notified to the second encryption unit 112.
[0026]
The second encryption unit 112 generates an encryption key based on the identification information notified from the encryption method instruction unit 109, encrypts the digital data with the generated encryption key, and notifies the recording unit 115. At this time, the content of the encryption format 408 of the music data attribute information 401 is rewritten in the same way as when the instruction is not received from the instruction receiving unit 117.
The secondary recording medium 114 is composed of, for example, a DVD-RAM disk, MD, or a small semiconductor memory that is embedded or removable depending on the model of the playback device (not shown) shown in FIG. The music data encrypted at 110 is recorded by the recording unit 115. For example, if digital data is recorded on the DVD-RAM disc 203, music can be listened to by inserting the DVD-RAM disc 203 into the DVD-Audio player 204 as shown in FIG.
[0027]
The recording unit 115 is realized by the DVD-RAM drive 202 shown in FIG. 2, for example, and records the digital data notified from the encryption unit group 110 on the secondary recording medium 114. Further, when the recording is completed, the charging unit 118 is notified to that effect.
When the specific information acquisition unit 116 is instructed by the encryption method instruction unit 109 to acquire specific identification information of the secondary recording medium 114, for example, in the case of a DVD-RAM, it is written in a BCA (Burst Cutting Area). Read and notify information. The unique identification information of the secondary recording medium 114 is unique for each medium and is information recorded at the time of normal disk manufacture, and cannot be read or rewritten by a normal user operation. .
[0028]
Therefore, an encryption key is generated based on this identification information, and the digital data encrypted with this encryption key is recorded on a DVD-RAM disc. Even if the content of the DVD-RAM disc is copied and reproduced, the information on which the decryption key is based is different, so that it cannot be decrypted normally. As a result, the copyright of the music data can be reliably protected.
[0029]
In addition, when the encryption method instruction unit 109 gives an instruction to acquire unique identification information of a playback device (not shown) on which the secondary recording medium 114 is mounted, the unique information acquisition unit 116 displays the identification information of the playback device. Read and notify the encryption method instruction unit 109. Since the unique identification information of the playback device is also unique identification information for each device attached at the time of manufacturing the playback device, it cannot be read or rewritten by a normal user operation. Therefore, even if encrypted based on this identification information, it can be played back only by a specific playback device.
[0030]
The unique information acquisition unit 116 is instructed when the unique identification information instructed from the encryption method instruction unit 109 cannot be obtained, that is, when no identification information is attached to the secondary recording medium 114 or the playback device. The cipher method instruction unit 109 is notified that the unique identification information of the type specified cannot be acquired.
When the unique information acquisition unit 116 receives an instruction to acquire specific information without receiving an instruction of the type of specific information from the encryption method instruction unit 109, the secondary recording medium 114 is removed from the playback device such as a DVD-RAM disk. It is determined whether it is possible or it is removable and embedded in a playback device such as a small semiconductor memory. The identification information is read out, and the identification information of the secondary recording medium 114 is notified to the encryption method instruction unit 109. If it is not removable, the identification information of the reproduction device is read out, and the identification information of the reproduction device is similarly notified. . When the identification information cannot be acquired, this is notified to the encryption method instruction unit 109.
[0031]
The instruction receiving unit 117 is realized by a PC keyboard or mouse, receives an instruction of the type of encryption method from the user, and notifies the encryption method instruction unit 109 of the instruction.
In the information on the home page shown in FIG. 3 described above, there was only one selling price. However, if it is the content of the home page as shown in FIG. 5, the price (1) 501 and the price (2) 502 are two ways. The selling price of is shown.
[0032]
The price (1) 501 indicates the price when digital data is encrypted and recorded based on the unique identification information of the secondary recording medium 114, and the price (2) 502 reproduces the secondary recording medium 114. The price when digital data is encrypted and recorded based on the unique identification information of the playback apparatus is shown. These two types of prices can be freely set individually on the information provider side.
[0033]
The user gives an instruction to encrypt the digital data in the preferred encryption form with reference to the song information shown in FIG. 5 or its price information according to the usage form of the secondary recording medium 114 from the instruction receiving unit 117. Can do. For example, when reproduction is performed only on a specific reproduction apparatus, that is, when the secondary recording medium 114 is not reproduced on another reproduction apparatus, an instruction is given to perform encryption based on identification information unique to the reproduction apparatus. As shown in price (2) 502, encryption based on the identification information of the playback device is generally cheaper as shown in FIG. This is because the degree of freedom is lower than that of encryption based on the unique identification information of the secondary recording medium 114 because it cannot be played back by another playback device. When the user wants to freely select a playback device for playback, the user may instruct to perform encryption based on the identification information of the secondary recording medium 114.
[0034]
Note that the instruction receiving unit 117 and the above-described receiving unit 101 are configured as a single unit, but have been described as two components in the description.
The accounting unit 118 receives the notification of the attribute information 401 of the music data from the data extraction unit 103 and stores it. When the notification that the encrypted digital data is recorded on the secondary recording medium 114 is received from the recording unit 115, the charge amount is determined with reference to the price 406 in the attribute information, and the secure area of the primary recording medium 102 is determined. Are written together with the attribute information 401 as billing information.
[0035]
When there are a plurality of prices 406 such as price (1) 501 and price (2) 502 as shown in FIG. 5, the first to n-th encryption units 111 to 111 notified from the encryption method instruction unit 109 are used. The billing amount is determined according to which of 113 is used.
Next, the operation of this embodiment will be described with reference to the flowcharts of FIGS.
First, the reception unit 101 receives a homepage display request from a user, the data transmission / reception unit 100 accesses a homepage established by an information provider that provides music data, and the data extraction unit 103 displays a display unit (not shown). The home page (see FIG. 3 and FIG. 5) is displayed (S602).
[0036]
Next, the data extraction unit 103 waits for a purchase instruction of music data desired by the user from the reception unit 101, and instructs the data transmission / reception unit 100 to receive distribution of the designated music data (S604). When receiving the music data, the data transmitting / receiving unit 100 downloads the music data to the primary recording medium 102 (S606).
The user views the home page display and inputs the type of encryption method from the instruction receiving unit 117 according to the usage form of the secondary recording medium 114.
[0037]
The encryption method instruction unit 109 determines whether or not an instruction of the encryption method type is notified from the instruction receiving unit 117 (S608), and when notified, acquisition of specific information used for the specified encryption method type is obtained. The specific information acquisition unit 116 is instructed (S610). It is determined whether or not notification indicating that the specific information instructed from the specific information acquisition unit 116 cannot be acquired (S612). When the notification to that effect is received, the specified encryption method cannot be used for encryption. A message is displayed on the display unit (not shown) (S614), and the process is terminated. When receiving the notification of the specified type of unique information, the data extraction unit 103 is instructed to extract digital data.
[0038]
The data extraction unit 103 extracts music data recorded on the primary recording medium 102 (S616).
In S608, when it is determined that the instruction is not notified from the instruction reception unit 117, the encryption method instruction unit 109 instructs the specific information acquisition unit 116 to acquire specific information without specifying the type of specific information (S618).
[0039]
The unique information acquisition unit 116 determines the attribute of the secondary recording medium 114 (whether or not the secondary recording medium 114 attached to the playback device (not shown) is removable), and is a removable secondary recording medium. In the case of 114, the identification information of the secondary recording medium 114 is acquired, and in the case of the non-removable secondary recording medium 114, the identification information of the reproducing device is acquired (S620).
[0040]
When the encryption method instruction unit 109 receives the specific (identification) information acquired from the specific information acquisition unit 116 or a notification to the effect that the specific information cannot be acquired (S622), the data extraction unit 103 receives the digital data. Is taken out, and the process proceeds to S616.
Next, the determination unit 104 refers to the encryption format 408 in the attribute information 401 of the music data extracted by the data extraction unit 103, and which of the decryption units 106 to 108 of the decryption unit group 105 performs the decryption. Is determined (S702).
[0041]
The one decryption unit determined by the determination unit 104 decrypts the digital data input via the determination unit 104, and outputs the decrypted digital data to the encryption method instruction unit 109 (S704).
The encryption method instruction unit 109 selects one encryption unit of the encryption unit group 110 according to the specific information (including information indicating that the information cannot be acquired) already notified from the specific information acquisition unit 116, and the specific information (cannot be acquired). For the information to that effect, the generated random number) and the decrypted digital data are notified (S706).
[0042]
The one encryption unit that receives the notification from the encryption method instruction unit 109 generates an encryption key based on the unique (identification) information (for the notification of the random number, generates an encryption key based on the random number), and digitally Encrypt data. At this time, the content of the encryption format 408 in the attribute information 401 is also rewritten (S708).
The recording unit 115 records the digital data notified from any of the first to n-th encryption units 111 to 113 in the secondary recording medium 114 (S710), and notifies the charging unit 118 when the recording is completed.
[0043]
Upon receiving the notification from the recording unit 115, the charging unit 118 determines a charging amount according to the price 406 and the like notified from the data extraction unit 103, records the charging information in the primary recording medium 102 (S712), and ends the processing. To do.
In the above embodiment, the decoding unit group 105 is composed of a decoding module (decoding unit) for each information provider. However, the decoding unit group has a quality of music data, for example, 24-bit LPCM (Liner Each decoding unit may be provided according to digital data such as Pulse Code Modulation (MP3) or Moving Picture Experts Group 1 Audio Layer 3 (MP3). The high-quality 24-bit LPCM is encrypted digital data with high difficulty in decryption, the normal-quality MP3 is encrypted digital data with low difficulty in decryption, and the first decryption unit is 24 The bit LPCM digital data may be decoded, and the second decoding unit may decode the MP3 digital data.
[0044]
In the above-described embodiment, the encryption unit group 110 is provided with each encryption unit according to the type of unique information, but the digital data decrypted by the first decryption unit is the first corresponding to the quality described above. The digital data encrypted by the encryption unit, decrypted by the second decryption unit is encrypted by the second encryption unit, and the digital data decrypted by the nth decryption unit is encrypted by the nth encryption unit You may make it do. In this case, the data size of the encryption key used for encryption in the first encryption unit is set larger than that of the second encryption unit, and that of the second encryption unit is set larger than that of the nth encryption unit. . The billing unit determines the billing amount by the decryption unit obtained by decrypting the digital data and the encryption unit obtained by re-encrypting the decrypted digital data. By doing so, the copyright protection can be ensured more with high-quality music data. At this time, the information provider can also set a high price for high-quality music data.
[0045]
The digital data recording apparatus of the above embodiment is shown in the block diagram in FIG. 1, but records a program for causing a computer to perform the function of each component on a computer-readable recording medium such as a floppy disk. The digital data recording apparatus that does not have a copyright protection function can be used as a device having a copyright protection function.
[0046]
In this embodiment, the digital data is described as being downloaded from the host computer when the user makes a purchase request. However, only the music data or the attribute information is temporarily stored regardless of whether or not the digital data is purchased. It is also conceivable that a purchase procedure is performed on digital data recorded on the primary recording medium 102 in the PC and recorded on the primary recording medium 102.
[0047]
In the present embodiment, the attribute information 401 is described as being described separately from the song data 402. However, the attribute information 401 can be embedded in the digital data of the song data 402 in the form of a so-called Water Mark (electronic watermark). It is.
In the present embodiment, there is no particular mention regarding data input / output between the decryption unit group 105 and the encryption unit group 110 via the encryption method instruction unit 109. The transmission of data is performed, or the decryption unit group 105, the encryption method instruction unit 109, and the encryption unit group 110 are realized by a single chip to prevent leakage of the decrypted data. Good.
[0048]
Further, the accounting information has been described as being recorded in a secure area in the primary recording medium 102, but for the accounting information, a recording medium such as an IC card different from the primary recording medium 102 is provided, It is possible to record on this.
In this embodiment, the description of the charging timing is omitted. However, for example, when digital data is recorded on the secondary recording medium 114, it must be connected to the host computer, or the charging amount is It may be automatically connected to the host computer when a certain amount of money is reached, or automatically connected to the host computer when a certain date and time elapses after recording the accounting information.
[0049]
Furthermore, in the present embodiment, the information provided by the information provider has been described as audio information. However, the present invention is not limited to this, and video information, audio information, character information, or video information, audio information, and character information. Of course, a combination of these may be used.
(Embodiment 2)
FIG. 8 is a block diagram of Embodiment 2 of the digital data recording apparatus according to the present invention. This digital data recording apparatus is generally realized by a personal computer, and includes a data transmission / reception unit 2101, a primary recording medium 2102, a data extraction unit 2103, an encryption method determination unit 2104, a first decryption unit 2105, and a second decryption unit. 2106, a third decryption unit 2107, an encryption unit 2108, a recording unit 2109, a secondary recording medium 2110, an input unit 2111, a display unit 2112, and a recording medium specific information acquisition unit 2113. The decoding unit group 2115 includes a first decoding unit 2105, a second decoding unit 2106, and a third decoding unit 2107, but the number of decoding units is not limited to three. Here, it is shown that it is composed of a plurality of decoding units.
[0050]
In the present embodiment, it is assumed that the data to be recorded is music data and the music data is distributed via the Internet. In addition, it is assumed that data is encrypted with different encryption methods for each information provider.
An information provider provides information necessary for purchase such as a song title, price, copy control information (hereinafter referred to as attribute information) or information that is eager to purchase, superimposed on music data or separated from music data. However, in the present embodiment, a mode in which attribute information is provided separately from music data will be described.
[0051]
The data transmission / reception unit 2101 is a communication unit realized by a modem, and is connected to a provider's host computer (not shown) through a telephone line. First, the user acquires attribute information provided by the information provider. The attribute information acquired by the data transmission / reception unit 2101 is recorded on the primary recording medium 2102, and part or all of the information is displayed on the display unit 2112. FIG. 9 shows an example of information displayed on the display unit 2112. The displayed information includes contents such as a song title 2201, a song title code 2202, a singer name 2203, and a data acquisition destination 2204. Here, the song name 2201 and the singer name 2203 are information representing the song name and singer name for the music data, respectively. The song name code 2202 is an identifier for distinguishing music data from other music data, and is attached with, for example, ISRC (International Standard Recording Code) information. Based on these pieces of information, the user can select a favorite song through the input unit 2111 and notify a purchase request. In this embodiment, the data acquisition destination 2204 is URL (Uniform Resource Locator) information in which the corresponding music is recorded. Of course, if ISRC information is attached to the song name code 2202, the data acquisition destination can be specified from the song name code 2202.
[0052]
The input unit 2111 is realized by a mouse, a keyboard, and the like, receives an instruction to purchase a song from the user, that is, a recording instruction, and notifies the data transmission / reception unit 2101. Based on the information displayed on the display unit 2112, the user clicks on the song name with the mouse to instruct recording of music data.
When there is a music data recording instruction from the input unit 2111, the data transmission / reception unit 2101 downloads the song requested to be recorded from the provider's host computer through the telephone line. At this time, the position of the song data is specified based on the URL information in the attribute information. The downloaded data is once recorded on the primary recording medium 2102.
[0053]
The primary recording medium 2102 is generally a personal computer hard disk, and records music data that the user desires to purchase in an encrypted form. Therefore, for subsequent operations, it is not always necessary to connect to the host computer of the provider.
The data extraction unit 2103 extracts music data to be recorded from the primary recording medium 2102. At this time, the user selects music data to be recorded on the secondary recording medium 2110 through the input unit 2111, based on information similar to the information shown in FIG. The data extracted by the data extraction unit 2103 is encrypted by an encryption method for each information provider. For this reason, the encryption method determination unit 2104 determines that decryption is performed using an appropriate decryption method. Specifically, it is possible to add the information that can identify the encryption method to the header part of the digital data and transmit the data, or to describe the encryption method in the attribute information, and the encryption method according to these values. Determine.
[0054]
The first decryption unit 2105, the second decryption unit 2106, and the third decryption unit 2107 indicate that there is a decryption method for each information provider. It is not limited. The encryption method determination unit 2104 selects an appropriate decryption unit, and decrypts the data encrypted by the decryption unit. At this time, for example, a decryption key corresponding to the data encryption method acquired by the encryption method determination unit 2104 is obtained or generated, and the decryption unit decrypts the data based on the decryption key. Therefore, data encrypted by each method is once decrypted with respect to data encrypted by different encryption methods.
[0055]
Next, the data decrypted by the encryption unit 2108 is encrypted. Here, encryption is performed using unique information unique to the recording medium as encryption key information. Incidentally, since one method of performing encryption based on the recording medium specific information is disclosed in Japanese Patent Laid-Open No. 5-257816, detailed description thereof is omitted here.
The recording medium unique information acquisition unit 2113 takes out the unique information from the secondary recording medium 2110 according to the instruction from the encryption unit 2108, and transmits it to the encryption unit 2108.
[0056]
The encryption unit 2108 encrypts the unique information acquired by the recording medium unique information acquisition unit 2113 using the encryption key.
Here, information unique to the secondary recording medium 2110 will be described.
The secondary recording medium 2110 has unique identification information for each medium. For example, in the case of a DVD-RAM (Digital Versatile Disc Random Access Memory), this corresponds to information written in a BCA (Burst Cutting Area). This information is unique for each disc, and is normally recorded at the time of disc production and cannot be rewritten. Therefore, even if a malicious user duplicates the contents of a disc using a tool capable of bit copying, the information on which the decryption key is based cannot be decrypted and the data cannot be copied. It is possible to securely protect the rights.
[0057]
The recording unit 2109 records the encrypted data on the secondary recording medium 2110.
The operation of the digital data recording apparatus configured as described above will be described below with reference to the flowchart of FIG.
First, the data transmission / reception unit 2101 downloads attribute information (S2301), waits for a digital data recording instruction from the user (S2302), downloads the designated digital data, and records it on the primary recording medium 2102 (S2303). . Next, the encryption method of the downloaded data is determined, and decryption is instructed to an appropriate decryption unit 2105 to 2107 (S2304). Decoding is performed by the decoding units 2105 to 2107 (S2305). When the decrypted data is input, the encryption unit 2108 acquires the unique information of the secondary recording medium 2110 from the recording medium unique information acquisition unit 2113 (S2306). Using the acquired unique information as a part of the encryption key, an encryption key is created, and the encryption unit 2108 encrypts the data (S2307). The recording unit 2109 records the encrypted data on the secondary recording medium 2110 (S2308), and ends the process.
[0058]
This completes the description of the digital data recording apparatus according to the second embodiment of the present invention.
Next, a digital data recording apparatus according to Embodiment 3 of the present invention will be described.
(Embodiment 3)
FIG. 11 is a configuration diagram of Embodiment 3 of the digital data recording apparatus according to the present invention. This digital data recording apparatus is generally realized by a personal computer, and includes a data transmission / reception unit 2101, a primary recording medium 2102, a data extraction unit 2103, an encryption method determination unit 2104, a decryption unit group 2115, an attribute information acquisition unit 2401, a copy control. An information detection determination unit 2402, a copy control information conversion unit 2403, a billing information calculation unit 2404, an encryption unit 2108, a recording unit 2109, a secondary recording medium 2110, an input unit 2111, a display unit 2112, and a recording medium specific information acquisition unit 2113 are provided. Prepare.
[0059]
In the third embodiment, the same reference numerals are given to the same components as those of the digital data recording apparatus of the second embodiment, the description thereof is omitted, and the portions unique to the present embodiment are described. To do.
First, in the present embodiment, it is assumed that the attribute information of data to be recorded is as shown in FIG. The attribute information shown in FIG. 12 includes information such as copy control information 2501 and charging information 2502 in addition to the attribute information shown in FIG. Here, the copy control information 2501 includes information on the number of generations or the number of times copying is permitted. For example, regarding the number of generations, values such as “unlimited copy allowed”, “one generation copy allowed (grandchild copy prohibited)”, “copy prohibited”, and the like are taken. On the other hand, the number of times is the number of times copying is permitted and can take an integer value of 0 or more. For example, “grandchild copy is impossible” means that after recording digital data on the secondary recording medium 2110, copying based on the data in the secondary recording medium 2110 is not permitted. “Unrestricted permission” means no restriction. When information on the number of times of copying is included, such as “2 times copying is possible”, it means the number of times that data can be recorded on the secondary recording medium 2110.
[0060]
The attribute information acquisition unit 2401 acquires attribute information corresponding to data to be reproduced from the primary recording medium 2102. Here, copy control information and billing information are extracted. Since the attribute information includes copyright protection information and billing information, it is desirable that the attribute information be recorded in a secure area in the primary recording medium 2102 and cannot be accessed by a normal user operation.
[0061]
The copy control information detection determination unit 2402 extracts the copy control information in the attribute information, and acquires information on whether or not subsequent copying is permitted, and if it is permitted, the number of generations or the number of times.
When copying is permitted, the copy control information detection determination unit 2403 rewrites the copy control information as necessary. For example, when grandchild copy is prohibited, the value of the copy control information is changed to prohibit subsequent copying, and when the permitted number of copies is limited, the value is subtracted by “1” from the permitted number. change.
[0062]
What is important here is the numerical value of how many times data recorded on the primary recording medium 2102 is copied to the secondary recording medium 2110 when the copy permission count is set. The data to be rewritten is data recorded in the primary recording medium 2102. Therefore, it is recorded in the primary recording medium 2102. The copy permission count is converted to a value obtained by subtracting “1”, and the copy permission count to be recorded on the secondary recording medium 2110 is recorded as 0.
[0063]
The charging information calculation unit 2404 acquires the charging information of the corresponding song from the attribute information acquired by the attribute information acquisition unit 2401, calculates the charging amount based on this, and records it in a secure area in the primary recording medium 2102 To do.
The operation of the digital data recording apparatus configured as described above will be described below with reference to the flowcharts of FIGS.
[0064]
First, the data transmitting / receiving unit 2101 downloads attribute information (S2601), waits for a digital data recording instruction from the user (S2602), downloads the instructed digital data, and records it on the primary recording medium 2102 (S2603). . Next, attribute information of the data to be recorded is acquired by the attribute information acquisition unit 2401 (S2604). The copy control information determination unit 2402 determines copy control information in the attribute information, and determines whether copying is permitted (S2605). When copying is permitted, information on the generation and number of times for which copying is permitted is acquired and rewritten by the copy control information conversion unit 2403 as necessary (S2606). If copying is not permitted, the subsequent processing is interrupted (S2607). Next, the encryption method is determined, and decryption is instructed to an appropriate decryption unit in the decryption group 2115 (S2608). Decoding is performed by the decoding units 2105 to 2107 (S2609). When the decryption is completed, an appropriate billing amount is calculated from the billing information in the attribute information acquired by the attribute information acquiring unit 2401 (S2610).
[0065]
When the decrypted data is input, the encryption unit 2108 acquires the unique information of the secondary recording medium 2110 from the recording medium unique information acquisition unit 2113 (S2611). Using the acquired unique information as a part of the encryption key, an encryption key is created, and the encryption unit 2108 encrypts the data (S2612). The recording unit 2109 records the encrypted data on the secondary recording medium 2110 (S2613), and ends the process.
[0066]
This completes the description of the third embodiment of the present invention.
(Embodiment 4)
Next, a digital data recording apparatus according to Embodiment 4 of the present invention will be described. This digital data recording apparatus is almost the same as that of the second embodiment, except that the unique information acquisition / transmission unit 2803, the recording unit 2109, and the secondary recording medium 2110 are in the second digital data recording apparatus. Only the information of is different. FIG. 15 is a block diagram of Embodiment 4 of the digital data recording apparatus according to the present invention. This digital data recording apparatus includes a first digital data recording apparatus 2800 and a second digital data recording apparatus 2801.
[0067]
The first digital data recording apparatus 2800 includes a data transmission / reception unit 2101, a primary recording medium 2102, a data extraction unit 2103, an encryption method determination unit 2104, a decryption unit group 2115, an encryption unit 2108, an input unit 2111, a display unit 2112, A unique information acquisition unit 2802 is provided.
The second digital data recording device 2801 includes a unique information acquisition / transmission unit 2803, a recording unit 2109, and a secondary recording medium 2110.
[0068]
In the fourth embodiment, the same reference numerals are given to the same components as those of the digital data recording apparatus of the second embodiment, the description thereof is omitted, and the portions unique to the present embodiment are described. To do.
When the data decrypted by the decryption unit group 2115 is input to the encryption unit 2108, the recording medium unique information acquisition unit 2802 transmits the unique information to the unique information acquisition / transmission unit 2803 in the second digital data recording device 2801. Send a request to send. The unique information acquisition / transmission unit 2803 acquires the unique identification information of the secondary recording medium 2110 attached to the second digital data recording device 2801, the identification information unique to the second digital data recording device 2801, or both. And sent to the unique information acquisition unit 802.
[0069]
In the encryption unit 2108, the unique identification information of the secondary recording medium 110 attached to the second digital data recording device 2801, the identification information unique to the second digital data recording device 801, or the secondary recording medium 2110 The data is encrypted with a combination of the unique identification information and the identification information unique to the second digital data recording apparatus 2801 as a part of the encryption key, and is output to the second digital data recording apparatus 2801. The recording unit 2109 in the second digital data recording device 2801 records the encrypted data on the secondary recording medium 2110.
[0070]
It is specific information acquired and transmitted by the specific information acquisition / transmission unit 2803. When the secondary recording medium 2110 is fixedly provided in the second digital data recording apparatus 2801, it is used as identification information specific to the apparatus, When the secondary recording medium 2110 is detachably provided, the unique information unique to the secondary recording medium 2110 or the unique identification information of the secondary recording medium 2110 and the identification information unique to the second digital data recording device 2801 By using a combination of information, a more flexible encryption method can be used.
[0071]
This is the end of the description of the fourth embodiment.
(Embodiment 5)
Next, a fifth embodiment of the digital data recording apparatus according to the present invention will be described. This digital data recording apparatus is almost the same as in the second, third and fourth embodiments. Here, the configuration diagram used in the description of Embodiment 4 will be described with reference to FIG. The difference is that an encryption format corresponding to the secondary recording medium 2110 is adopted and recorded. That is, since the minimum unit of data to be handled and the unit of the data amount unit for writing the encrypted data are different between the DVD-RAM and the semiconductor memory, the specific information acquisition unit 2802 receives information about the medium from the specific information acquisition and transmission unit 2803. Is obtained, and encryption is performed in an optimum data unit. For this reason, a plurality of encryption units 2108 exist, and unique information and medium information are also transmitted to an appropriate encryption unit. As described above, not only the DVD-RAM but also a semiconductor memory, an IC card, a hard disk or the like can be used as the secondary recording medium 2110.
[0072]
This is the end of the description of the fifth embodiment.
In addition, the said Embodiment 2-5 was only demonstrated as a system example which can anticipate the best effect in the present condition. The present invention can be implemented and modified without departing from the gist thereof. Specifically, the following modifications are possible.
In the second to fifth embodiments, the digital data is described as being downloaded from the host computer when the user makes a purchase request. However, the primary recording medium 2102 in the user's PC is temporarily used regardless of whether or not the digital data is purchased. It is also conceivable to perform a purchase procedure on digital data recorded in the primary recording medium 2102 in advance.
[0073]
In the second to fifth embodiments, the copy control information is described as attribute information. However, it is also possible to embed it in digital data in a so-called WaterMark (electronic watermark) format.
Further, the accounting information has been described as being recorded in a secure area in the primary recording medium 2102. However, for the accounting information, a recording medium such as an IC card different from the primary recording medium 2102 is provided, It is possible to record on this.
[0074]
In Embodiments 2 to 5, the information provided by the information provider has been described as audio information. However, the present invention is not limited to this, and video information, audio information, character information, or video information and audio information and characters are not limited thereto. Of course, it may be a combination of information.
(Embodiment 6)
FIG. 16 is a block diagram of Embodiment 6 of the digital data recording apparatus according to the present invention.
[0075]
This digital data recording apparatus includes a communication unit 3101, a recording medium 3102, a received data recording determination unit 3103, a display unit 3104, an input operation unit 3105, a recording medium specific information acquisition unit 3106, an encryption unit 3107, , A recording unit 3108, a charging information recording unit 3109, a charging information recording medium 3110, and a charging unit 3111, which are realized by a PC.
[0076]
The communication unit 3101 is realized by a modem, and is connected to a data provider host computer (not shown) and a billing center (not shown) via a telephone line. When the digital data and its attribute information are received from the host computer, the received data recording determination unit 3103 is notified.
Further, the communication unit 3101 notifies the charging unit 3111 of the usage fee inquiry from the charging center, and receives the charging information notification from the charging unit 3111. To be notified.
[0077]
In the present embodiment, digital data provided by a data provider will be described as music data. The data provider uses digital data obtained by encrypting the music data to be provided as necessary, and an information identifier is attached to the digital data. The information identifier is a song name code and is used for identification from other music. Further, attribute information is added to the digital data. The attribute information indicates a usage fee for digital data, and includes information indicating which information provider provides the information.
[0078]
FIG. 17 is a diagram illustrating an example of the contents of attribute information. The attribute information 3201 includes items such as a song name 3202 of a digital data, a performer (singer) 3203, a song name code 3204, a recording fee 3205, a reproduction fee 3206 per reproduction, a reproducible number of times 3207, an encryption state 3208, a copy permission 3209, and the like. Is included.
Here, the song name 3202 and the performer 3203 are displayed on the display unit 3104 and serve as determination materials for instructing whether or not the user copies (duplicates). The song name code 3204 is an identifier for distinguishing music data from other music data, and is unique for each song. For example, ISRC (International Standard Recording Code) is attached. This code is composed of a country code (two ASCII characters), an owner code (three ASCII characters), a recording year (two digits), and a serial number (five digits).
[0079]
The recording fee 3205, the reproduction fee 3206 per reproduction, the reproducible number of times 3207, etc. constitute accounting reference data, and all are information for calculating the usage fee of the music data.
The recording fee 3205 is a fee for recording digital data received by the communication unit 3101 on the recording medium 3102. A reproduction fee 3206 per time indicates a fee per reproduction of the digital data recorded on the recording medium 3102. The reproducible number of times 3207 indicates the number of times that digital data recorded on the recording medium 3102 is permitted to be reproduced. When “100 times” is recorded, it indicates that the data can be reproduced only 100 times. In addition, it is possible to set a purchase format in which a subsequent fee is not required when the number of reproductions exceeds a certain number.
[0080]
The encryption state 3208 is an encryption presence / absence flag, and indicates whether the digital data received by the communication unit 3101 is encrypted.
Copy permission 3209 is a recording permission flag, and is information indicating whether or not recording on the user side, that is, recording of music data received on the recording medium 3102 is permitted. “Only once” indicates that recording is permitted only once, and “permitted” indicates that recording is permitted any number of times.
[0081]
The main object of the present invention is to record (copy) the received music data on the recording medium 3102 and to protect the copyright of the music when the music data is played back. The explanation for the case where only listening is permitted is simplified. In this case, the copy permission 3209 is “impossible”. In this digital data recording apparatus, although the decoding unit and the output unit are omitted from the configuration, the digital data received by the communication unit 3101 is decoded by the decoding unit, and music is output from the output unit. . At this time, the charge standard data includes a listening fee.
[0082]
The recording medium 3102 is made of a rewritable storage member, and is detachably attached to the apparatus main body, and is composed of, for example, a DVD-RAM.
Unique information of the recording medium 3102 is recorded in advance in a non-rewritable secure area of the recording medium 3102.
In addition, digital data encrypted by the encryption unit 3107 is recorded on the recording medium 3102 by the recording unit 3108.
[0083]
Further, management information and attribute information of the recorded digital data are recorded on the recording medium 3102 by the recording unit 3108.
When receiving notification of the digital data and its attribute information 3201 from the communication unit 3101, the received data recording determination unit 3103 stores the attribute information 3201 when it is first notified. Among the attribute information, the song name 3202, the performer is stored. 3203, a recording fee 3205, a reproduction fee 3206 per time, and the like are displayed on the display unit 3104, and the digital data is notified to the encryption unit 3107.
[0084]
When a copy (duplication) instruction is received from the input operation unit 3105, it is determined whether or not copying of digital data of the music title code 3204 of the instructed music is possible by referring to the copy permission 3209 of the attribute information 3201. If copying is permitted, the recording medium unique information acquisition unit 3106 is instructed to acquire the unique information of the recording medium 3102. In addition, the music title code 3204 and the encryption state 3208 are notified to the encryption unit 3107.
[0085]
If copying is impossible, the display unit 3104 displays that effect.
When the received data recording determination unit 3103 receives a copy end notification from the recording unit 3108, it rewrites the stored item of the attribute information 3201 and the copy permission 3209. That is, when the copy permission 3209 is “only once”, it is rewritten to “copy not possible”, and when “number of times allowed” is recorded, it is rewritten to a number obtained by subtracting “1”. The storage area for storing the attribute information 3201 is provided in the EEPROM, and the stored contents are not lost even when the power of the digital data recording apparatus is turned off.
[0086]
For example, after notifying the encryption unit 3107 of “song01” of the song name code 3204 and receiving a copy end notification from the recording unit 3108, the item corresponding to “song01”, copy permission 3209 is changed from “only once allowed”. Rewrite to "Cannot copy". By doing so, it is possible to prevent the rights of the data provider from being violated.
[0087]
The display unit 3104 is composed of a liquid crystal display, a CRT, or the like, and displays a song name or the like of music data that is digital data or a message that copying cannot be performed under the control of the reception data recording determination unit 3103.
The input operation unit 3105 is composed of a mouse or the like, accepts a user copy instruction, and notifies the received data recording determination unit 3103. The user looks at the song name displayed on the display unit 3104 and the player's display, and when downloading the music to the recording medium 3102, the user clicks the song name with the mouse to instruct the copying of the music. .
[0088]
When the recording medium unique information acquisition unit 3106 receives a unique information acquisition instruction from the received data recording determination unit 3103, the recording medium unique information acquisition unit 3106 reads the unique information recorded in the secure area of the recording medium 3102 and notifies the encryption unit 3107.
The encryption unit 3107 creates an encryption key based on the unique information notified from the recording medium unique information acquisition unit 3106. The digital data encrypted by using the encryption key that created the digital data notified from the received data recording determination unit 3103 is created and notified to the recording unit 3108.
[0089]
If the digital data notified from the received data recording determination unit 3103 has been notified that it has been encrypted, the digital data may be decrypted or left as it is.
For example, when the digital data dataA to be recorded on the recording medium 3102 is notified from the received data recording determination unit 3103, if the encryption key KM is created based on the unique information of the recording medium 3102, the encrypted digital data E (KM , dataA). When recording the digital data dataA on another recording medium, when the encryption key K′M is created based on the unique information of the other recording medium, the encrypted digital data E is E (K′M, dataA).
[0090]
Here, a technique for encrypting digital data is described in JP-A-5-257816.
The recording unit 3108 records the encrypted digital data notified from the encryption unit 3107 on the recording medium 3102. At this time, management information of the digital data recorded on the recording medium 3102 is created and recorded on the recording medium 3102.
[0091]
FIG. 18 is a diagram illustrating an example of management information. In the management information 3301, a song name code 3204 that is an identifier of recorded digital data and a recording start address 3302 and a recording end address 3303 of the digital data recorded on the recording medium 3102 are recorded correspondingly.
When the digital data recorded on the recording medium 3102 is reproduced, the management information 3301 is referred to.
[0092]
When recording of the encrypted digital data and management information on the recording medium 3102 is completed, the recording unit 3108 reads the attribute information 3201 corresponding to the recorded digital data stored in the received data recording determination unit 3103, Write to the recording medium 3102. Further, the received data recording determination unit 3103 is notified of the end of copying. In addition, the billing information recording unit 3109 is notified of the song name code of the recorded digital data.
[0093]
Upon receiving the notification of the song name code 3204 from the recording unit 3108, the billing information recording unit 3109 reads the recording fee 3205 of the attribute information 3201 corresponding to the song name code 3204 stored in the received data recording determination unit 3103, and the recording fee is When paying, the music name code, recording fee, recording date and time, etc. are recorded as charging information on the charging information recording medium 3110.
[0094]
The billing information recording medium 3110 includes a RAM card or the like, and billing information of digital data downloaded to the recording medium 3102 is recorded by the billing information recording unit 3109.
When there is a usage fee inquiry from a billing center (not shown) via the communication unit 3101, the billing unit 3111 reads the unsettled billing information recorded in the billing information recording medium 3110 and sends it to the communication unit 3101. Notice. When the notification is completed, a flag that has been notified (settled) to the charging center is recorded in the charging information recording medium 3110.
[0095]
Next, the operation of the present embodiment will be described using the flowchart of FIG.
First, the received data recording determination unit 3103 waits for a digital data recording instruction from the user (S3402), and determines whether or not copying of the instructed digital data is permitted by referring to the attribute information 201 (S3404). If NO, the display unit 3104 displays that copying is not permitted (S3406), and the process ends.
[0096]
When copying is permitted, the recording medium unique information acquisition unit 3106 acquires the unique information of the recording medium 3102 recorded in the secure area of the recording medium 3102 and notifies the encryption unit 3107 (S3408). .
The encryption unit 3107 creates an encryption key based on the unique information and encrypts the digital data (S3410).
[0097]
The recording unit 3108 records the encrypted digital data on the recording medium 3102 (S3412).
Next, the billing information recording unit 3109 determines whether or not the recording fee for the recorded digital data is charged (S3414). If it is free, the process ends. If it is charged, the charge information is recorded in the charge information recording medium 110 (S3416), and the process ends.
[0098]
FIG. 20 is a block diagram of a reproducing apparatus for digital data recorded on the recording medium 3102 by the digital data recording apparatus described above.
This digital data reproduction apparatus includes a recording medium 3102, an input operation unit 3501, a reproduction information reading unit 3502, a display unit 3503, a recording medium specific information acquisition unit 3504, a decoding unit 3505, a reproduction unit 3506, A billing information recording unit 3507 and a billing information recording medium 3508 are provided.
[0099]
The recording medium 3102 records unique information that is an identifier for identifying the DVD-RAM in which the digital data encrypted by the digital data recording apparatus, the management information 3301, and the attribute information 3201 are recorded.
When the input operation unit 3501 receives an instruction to start reproduction from the user, the input operation unit 3501 gives an instruction for initial activation to the reproduction information reading unit 3502. When an instruction for the song name is received from the user, the playback information reading unit 3502 is notified of the song name. In addition to the initial activation instruction, the automatic reproduction mode instruction is also given to the reproduction information reading unit 3502 when the recording medium 3102 is inserted into the digital data reproduction apparatus.
[0100]
Upon receiving an initial activation instruction from the input operation unit 3501, the reproduction information reading unit 3502 reads the attribute information 3201 recorded on the recording medium 3102 and displays a list of the song name 3202 and the player 3203 as the items. To display. Also, upon receiving a song title instruction or an automatic playback mode instruction from the input operation unit 3501, it is determined whether or not the corresponding number of possible playbacks 3207 of the attribute information 3201 is “1” or more. If the number of reproducible times 3207 is “1” or more, the song name code 3204 is read, the encrypted digital data recorded from the recording start address to the recording end address of the management information 3301 is read, and the decryption unit 3505 is read. Notice. At this time, the recording medium unique information acquisition unit 3504 is instructed to acquire the unique information, and the charge information recording unit 3507 is notified of the song name code 3204 and the reproduction fee 3206 per time. When the reading of the digital data is completed, the number of reproducible times 3207, which is an item of the attribute information 3201, is rewritten to a number obtained by subtracting “1”. If the reproducible count 3207 is “infinite”, it is left as it is.
[0101]
When it is determined that the number of reproducible times is less than “1”, the reproduction information reading unit 3502 displays on the display unit 3503 that the number of reproducible times has been exceeded.
A display unit 3503 includes a liquid crystal display or the like, and displays a list of music titles read by the reproduction information reading unit 3502. In addition, in response to the song name designation from the user exceeding the reproducible number of times, the fact that the reproducible number of times is exceeded is displayed.
[0102]
When the reproduction information reading unit 3502 is instructed to acquire specific information, the recording medium specific information acquisition unit 3504 acquires specific information that is an identifier of the recording medium 3102 from a secure area of the recording medium 3102, and a decoding unit 3505. Notify
Upon receiving notification of unique information from recording medium unique information acquisition unit 3504 and notification of encrypted digital data from reproduction information reading unit 3502, decryption unit 3505 creates a decryption key based on the unique information. Then, the encrypted digital data is decrypted and the decrypted digital data is notified to the playback unit 3506.
[0103]
Upon receiving notification of digital data from the decoding unit 3505, the reproduction unit 3506 decodes and reproduces music. When the music playback is finished, the charging information recording unit 3507 is notified of the playback end.
Upon receiving the notification of the end of playback from the playback unit 3506, the billing information recording unit 3507 uses the song name code 3204, the playback fee 3206 per playback, and the playback date and time notified from the playback information reading unit 3502 as billing information. Recording is performed on the recording medium 3508. If the reproduction fee 3206 per time is not charged, recording is not performed.
[0104]
The billing information recording medium 3508 is composed of a RAM card or the like, and billing information is recorded by the billing information recording unit 3507.
Next, the operation of this digital data reproducing apparatus will be described with reference to the flowchart shown in FIG.
First, the user instructs the start of reproduction using the remote controller or the like of the input operation unit 3501, and designates the song name displayed on the display unit 3503. The reproduction information reading unit 3502 determines that it is a music reproduction request (S3602), and determines whether or not the number of reproductions of the designated song name is “1” or more by referring to the attribute information 3201 (S3604). If the number of reproducible times is less than “1”, the display unit 3503 displays that the number of reproducible times has been exceeded (S3606), and ends the process.
[0105]
If the number of reproducible times is “1” or more, the reproduction information reading unit 3502 reads the encrypted digital data from the recording medium 3102 and notifies the decryption unit 3505 (S3608).
The recording medium specific information acquisition unit 3504 acquires the specific information from the recording medium 3102 and notifies the decoding unit 3505 (S3610).
[0106]
The decryption unit 3505 decrypts the encrypted digital data using the unique information as a decryption key (S3612).
The playback unit 3506 decodes the digital data and plays back and outputs music (S3614).
The charging information recording unit 3507 determines whether or not the reproduction fee is charged (S3616). If the charging fee is free, nothing is done, and if it is charged, the charging information is recorded in the charging information recording medium 3508 ( S3618), the process is terminated.
[0107]
(Embodiment 7)
FIG. 22 is a block diagram of Embodiment 7 of the digital data recording apparatus according to the present invention. This digital data recording apparatus includes a first digital data recording apparatus 3700 and a second digital data recording / reproducing apparatus 3710.
The first digital data recording device 3700 includes a first recording medium 3701, a communication unit 3101, a received data primary recording determination unit 3702, a display unit 3104, an input operation unit 3105, a primary recording unit 3703, A data read determination unit 3704, a unique information acquisition unit 3705, an encryption unit 3706, a billing information recording unit 3109, a billing information recording medium 3110, and a billing unit 3111 are provided and realized by a PC.
[0108]
The second digital data recording / reproducing device 3710 includes a unique information acquisition / transmission unit 3707, a secondary recording unit 3708, a second recording medium 3709, an input operation unit 3501, a reproduction information reading unit 3502, a display unit 3503, A decrypting unit 3505, a reproducing unit 3506, a charging information recording unit 3507, and a charging information recording medium 3508 are provided.
[0109]
The same components as those of the digital data recording apparatus and the digital data reproducing apparatus of the sixth embodiment are denoted by the same reference numerals, description thereof is omitted, and only the parts unique to the present embodiment are described. explain.
First, the first digital data recording device 3700 will be described. The difference from the digital data recording apparatus of the sixth embodiment is that a first recording medium 3701 is fixedly provided in this apparatus, and the digital data recorded on the first recording medium 3701 is encrypted for secondary recording. To be output.
[0110]
The first recording medium 3701 is composed of a writable recording member such as a hard disk that is fixedly provided in the apparatus 3700. Digital data that is music data received by the communication unit 3101 and its management information are written to the first recording medium 3701 by the primary recording unit 3703.
The reception data primary record determination unit 3702 writes the attribute data attached to the digital data received by the communication unit 3101 in a storage area provided in the EEPROM. An example of attribute information received in the present embodiment is shown in FIG. The attribute information 3801 indicates that the attribute information 3201 and the secondary recording fee 3802 of the sixth embodiment are recorded, and the number of times permitted to record the copy permission (primary) 3803 and (secondary) 3804. Is different.
[0111]
Also, “Song E” of the song name code “song05” indicates that copying is not permitted for both primary and secondary, and that only real-time listening is permitted.
Upon receiving an instruction for secondary recording of a certain music from the user, the received data primary recording determination unit 3702 first checks the item copy permission (primary) 3803 of the attribute information 3801 to determine whether or not primary recording is permitted. Judgment. If not permitted, the display unit 3104 displays a message indicating that the information is not permitted. If permitted, the primary recording unit 3703 is notified of the digital data of the instructed music. Other functions are the same as those of the reception data recording determination unit 3103 of the sixth embodiment.
[0112]
The primary recording unit 3703 records the notified digital data on the first recording medium 3701. At this time, the management information is written in the same manner as the recording unit 3108 in the sixth embodiment. In the sixth embodiment, the encryption key is created based on the unique information of the recording medium 3102 and the digital data is encrypted. However, in the present embodiment, the first recording medium 3701 is removed, Since it is not used by other devices, it is not encrypted.
[0113]
In addition, when the recording of the digital data on the first recording medium 3701 is completed, the primary recording unit 3703 notifies the received song name code 3805 to the received data read determination unit 3704.
When receiving the notification of the song title code 3805 from the primary recording unit 3703, the reception data reading determination unit 3704 indicates whether or not secondary recording of the music is permitted, and attribute information 3801 of the reception data primary recording determination unit 3702. Judgment is made by looking at the copy permission (secondary) 3804 inside. When it is not permitted, or when the permitted number is not “1” or more, the display unit 3104 displays that secondary recording is not permitted.
[0114]
When the secondary recording is permitted, the reception data reading determination unit 3704 looks at the management information (see FIG. 18) and reads the digital data of the notified song name code recorded on the first recording medium 3701. The encryption unit 3706 is notified, and the unique information acquisition unit 3705 is instructed to acquire unique information.
Further, when the reading of the digital data is completed, the reception data reading determination unit 3704 subtracts “1” from the number of times of copy permission (secondary) 3804 of the attribute information 3801 stored in the reception data primary recording determination unit 3702. Rewrite as a number. For example, if it is “permitted only once”, it is rewritten as “non-permitted”, and if only “permitted”, the number of times is unlimited, so rewriting is not performed as it is.
[0115]
The reception data read determination unit 3704 reads out the attribute information stored in the reception data primary record determination unit 3702 and notifies the encryption unit 3706 after the notification of the digital data.
When the unique information acquisition unit 3705 is instructed to acquire the unique information from the reception data read determination unit 3704, the unique information acquisition unit 3705 acquires and transmits the unique information of the second digital data recording / reproducing device 3710 connected to the first digital data recording device 3700. Requests the part 3707 to send the unique information. When the notification of unique information is received from the unique information acquisition / transmission unit 3707, the unique information is notified to the encryption unit 3706.
[0116]
The encryption unit 3706 creates an encryption key based on the unique information notified from the unique information acquisition unit 3705, encrypts the digital data notified from the received data read determination unit 3704, and performs the second digital data recording / reproducing device 3710. To the secondary recording unit 3708. After sending out the encrypted digital data, the notified attribute information is also sent out.
[0117]
Next, the second digital data recording / reproducing device 3710 will be described. The second digital data recording / reproducing device 3710 is realized by a portable device such as a headphone stereo type device. Further, the second recording medium 3709 is composed of a semiconductor memory IC card or the like that is detachable from the device 3710.
When the unique information acquisition / transmission unit 3707 receives the transmission request of the unique information from the unique information acquisition unit 3705 of the first digital data recording device 3700, the unique identification of the second recording medium recorded in the second recording medium 3709 in advance. Information and device identification information unique to the device 3710 are acquired and notified to the specific information acquisition unit 3705. In addition, upon receiving a notification instruction for specific information from the reproduction information reading unit 3502, the medium identification information and device identification information are notified to the decryption unit 3505.
[0118]
When receiving the output of the encrypted digital data and the attribute information from the encryption unit 3706 of the first digital data recording device 3700, the secondary recording unit 3708 records it on the second recording medium 3709. In addition, management information 3301 as shown in FIG. 18 is recorded. The decryption unit 3505 creates a decryption key based on the two information of the medium identification information and the device identification information notified from the unique information acquisition / transmission unit 3707, and the encrypted information notified from the reproduction information reading unit 3502. Decode the received digital data. Other configurations are almost the same as the configuration of the digital data reproducing apparatus of the sixth embodiment.
[0119]
Next, a case where the second recording medium 3709 is constituted by an IC card or the like fixedly provided in the device 3710 will be described. In this case, since the second recording medium 3709 is not reproduced by any device other than the device 3710, the unique information acquisition / transmission unit 3707 does not acquire the medium identification information, but stores the device identification information stored in itself. The unique information acquisition unit 3705 is notified. Also, the device identification information is notified to the decryption unit 3505.
[0120]
Thus, depending on whether or not the second recording medium 3709 provided in the second digital data recording / reproducing device 3710 is detachable, the encryption key for encrypting the digital data is created with the medium identification information, device identification information, It is possible to select whether to use the combination or the device identification information alone. Such proper use can also prevent illegal duplication or illegal reproduction of digital data.
[0121]
Next, the operation of the present embodiment will be described with reference to the flowchart shown in FIG.
First, the received data primary recording determination unit 3702 waits for an instruction for secondary recording of digital data from the input operation unit 3105 (S3902), and determines whether primary recording of digital data is permitted or not. Judgment is made by looking at 3801 (S3904). If not permitted, a message to that effect is displayed on the display unit 3104 (S3906), and the process is terminated.
[0122]
When permitted, the received data primary recording determination unit 3702 notifies the primary recording unit 3703 of the digital data. The primary recording unit 3703 records digital data and management information on the first recording medium 3701 (S3908).
Next, the billing information recording unit 3109 determines whether or not the primary recording is billed (S3910) and records the billing information on the billing information recording medium 3110 when the primary copy is charged (S3912). ).
[0123]
Next, the reception data reading determination unit 3704 determines whether secondary recording of digital data recorded on the first recording medium 3701 is permitted or not, and attribute information 3801 stored in the reception data primary recording determination unit 3702. Judgment is made by looking at (S3914). If not permitted, the display unit 3104 displays that secondary recording is not permitted (S3916), and the process ends.
[0124]
If permitted, received data read determining section 3704 reads digital data from first recording medium 3701, notifies encryption section 3706, and sends unique information acquisition section 3705 from second digital data recording / reproducing device 3710. Instructs to acquire unique information. The unique information acquisition unit 3705 acquires the unique information and notifies the encryption unit 3706 (S3918). The encryption unit 3706 creates an encryption key based on the notified unique information (S3920), encrypts the notified digital data, and outputs it to the secondary recording unit 3708 of the second digital data recording / reproducing device 3710. .
[0125]
The secondary recording unit 3708 records the notified encrypted digital data, attribute information, and management information on the second recording medium 3709 (S3922).
Further, the billing information recording unit 3109 determines whether or not the secondary recording is billed (S3924), and when the secondary recording is charged, the billing information is recorded in the billing information recording medium 110 (S3926). ), The process is terminated.
[0126]
Note that the operation of reproducing digital data in the second digital data recording / reproducing apparatus 3710 is substantially the same as the operation of the digital data reproducing apparatus of the sixth embodiment, and a description thereof will be omitted.
(Modification)
In the seventh embodiment, when the second recording medium 3709 is detachable, digital data is obtained with an encryption key that combines the device identification information of the second digital recording / reproducing device 3710 and the medium identification information of the second recording medium 3709. In this modification, the encryption type (whether it is an encryption key based only on the medium identification information or an encryption key in which the device identification information is combined with the medium identification information) is specified to the user. The degree of freedom of the user's usage form is expanded. That is, when the second digital data recording / reproducing device 3710 is to reproduce the music recorded on the second recording medium 3709, the digital data is encrypted and recorded with the medium identification information and the device identification information. When attempting to play music recorded on the second recording medium 3709 with a data playback device (device capable of decrypting digital data encrypted using the media identification information as a decryption key), the digital data is encrypted with the media identification information. To record. The encryption form can be selected according to the usage form of the user.
[0127]
On the other hand, the secondary recording fee is set according to the degree of freedom of use by the user to protect the copyright.
Hereinafter, a specific configuration of this modification will be described. Since this modification adds some functions to the configuration of the first digital data recording apparatus 3700 shown in FIG. 22, the configuration diagram of the seventh embodiment is used as it is, and this modification is unique. Only the configuration will be described.
[0128]
FIG. 25 shows a part of the attribute information 31001 stored in the received data primary record determination unit 3702. In this attribute information 31001, the contents of the secondary recording fee 3802 and the secondary recording fee 31002 of the attribute information 3801 shown in FIG.
The secondary recording fee 31002 varies depending on whether the encryption key for encryption is medium identification information (medium ID) 31003, device identification information (device ID) 31004, or a combination 31005 of medium identification information and device identification information. ing. In the case where the encryption key is created based on the medium identification information 31003, the second recording medium 3709 can be attached to another device and music can be played back, and the degree of freedom of the user is increased, so that the secondary recording fee (secondary duplication) Usage fee) is set to be higher than that in which the encryption key is created based on the device identification information 31004 or the combination 31005 of the medium identification information and the device identification information. The copy usage fee can be charged according to the expansion of the user's usage mode.
[0129]
Upon receiving the notification of the device identification information and the medium identification information from the unique information acquisition / transmission unit 3707, the unique information acquisition unit 3705 uses the second recording medium 3709 in another device on the display unit 3104, or receives the second digital data. Whether to use only in the recording / reproducing apparatus 3710 is displayed, and the selection of the user is awaited.
The user designates from the input operation unit 3105 whether to use another device or only the second digital data recording / reproducing device 3710. That is, it is instructed whether to create the encryption key only with the medium identification information or with a combination of the medium identification information and the device identification information.
[0130]
The input operation unit 3105 notifies this designation to the unique information acquisition unit 3705 and the received data primary record determination unit 3702.
When the received data primary record determination unit 3702 receives a notification from the input operation unit 3105 that another device will be used, the charging information recording unit 3109 informs the charging information recording unit 3109 that it is a secondary recording fee using the medium identification information 31003 as an encryption key. When the notification that only the second digital data recording / reproducing apparatus is used is received, it is notified that the secondary recording fee is set with the combination 31005 of the medium identification information and the device identification information as an encryption key.
[0131]
When the unique information acquisition unit 3705 receives a notification from the input operation unit 3105 that another device is to be used, the unique information acquisition unit 3705 notifies the encryption unit 3706 only of the medium identification information. In addition, when notification that only the second digital data recording / reproducing device 3710 is used is received, medium identification information and device identification information are similarly notified.
Upon receiving the notification that the encrypted digital data is sent from the encryption unit 3706 to the secondary recording unit 3708, the charging information recording unit 3109 receives the attribute information 31001 notified from the received data primary recording determination unit 3702. The charging information is recorded on the charging information recording medium 3110 with reference to the secondary recording fee 31002.
[0132]
In this modification, when the second recording medium is a detachable DVD-RAM, an encryption key is created based on only the identification information unique to the DVD-RAM, and the digital data is stored, as in the sixth embodiment. Of course, it can be encrypted and recorded.
In addition, the operation of this modification is not fundamentally different from the operation of the seventh embodiment, and a description thereof will be omitted.
[0133]
In the sixth and seventh embodiments and the modifications described above, the billing information recording media 3110 and 3508 may be realized by, for example, an IC card, and may not operate unless the IC card is set when recording or reproducing digital data. It is.
In the sixth and seventh embodiments and the modified examples, the digital data received by the communication unit 3110 has been described as music data. However, the present invention is not limited to this, and video data, audio data, character data, and these Of course, a combination of these may be used.
[0134]
The digital data recording / reproducing apparatus and digital data recording / reproducing apparatus of the sixth embodiment, the seventh embodiment and the modification are shown in FIG. 16, FIG. 20 and FIG. A program that exhibits a function is recorded on a computer-readable recording medium such as a floppy disk, and is applied to a digital data recording / reproducing apparatus that does not have a copyright protection function to provide a device having a copyright protection function. Can do.
[0135]
【The invention's effect】
As described above, the present invention provides a digital data recording apparatus for recording digital data on a recording medium, a communication means for receiving encrypted digital data via a digital network, and an encryption received by the communication means. A decryption means for decrypting the encrypted digital data, and a plurality of encryption sections, wherein each of the encryption sections encrypts the digital data with one of encryption schemes having different security levels; A recording means for recording the digital data encrypted by the encryption means on the recording medium; and a control means for controlling the decryption means and the encryption means, wherein the control means comprises the plurality of encryption means. One of the units re-encrypts the digital data decrypted by the decrypting means.
[0136]
With such a configuration, the digital data re-encrypted by the encryption unit that can be easily reproduced by the reproducing apparatus can be recorded on the recording medium, and the copyright can be protected because it is encrypted. .
The digital data recorded on the recording medium is reproduced by a reproducing device, and the encryption means encrypts the digital data with an encryption key generated based on the identification information of the recording medium. And a second encryption unit that encrypts digital data with an encryption key generated based on the identification information of the playback device, and the control means determines whether or not the recording medium is detachable from the playback device. If it is determined that the digital data is encrypted by the first encryption unit, the digital data is encrypted by the second encryption unit. .
[0137]
With such a configuration, when a recording medium is played back by any playback device, the digital data is encrypted with an encryption key generated based on the identification information of the recording medium and played back by a specific playback device. In this case, the digital data recorded on the recording medium can be reproduced by the reproducing apparatus by encrypting the digital data with the encryption key generated based on the identification information of the one reproducing apparatus.
[0138]
The digital data recording apparatus further includes a charging unit that performs a charging process via the digital network, and the control unit determines a charging value based on selection of the encryption unit that performs re-encryption. The charging means is controlled to perform charging processing based on the determined charging value.
With such a configuration, it is possible to select encryption units having different security levels and to pay a fee according to the encryption unit.
[0139]
Also, The encryption means further includes a third encryption unit that encrypts with an encryption key generated based on a random number, The control means includes First encryption unit or second encryption unit If the encryption key cannot be generated, the received encrypted digital data Re-encryption The Let the third encryption unit perform I am going to do that.
With this configuration, when the encryption unit cannot generate the encryption key, the digital data is Encrypt with encryption key generated based on random number be able to.
[0140]
The digital data encrypted by the plurality of encryption units included in the encryption means has a lower security level than the encryption of the digital data received by the communication means.
With such a configuration, the playback device can easily play back digital data, leading to cost reduction of the playback device.
[0141]
The digital data received by the communication means is encrypted by one of encryption schemes having different security levels, and the received digital data includes attribute information indicating the encryption scheme of the digital data. The decryption unit includes a plurality of decryption units, the decryption unit decrypts each of the digital data encrypted by the encryption method having the different security levels, and the control unit includes the communication unit. Determining the encryption method of the received encrypted digital data based on the attribute information, and the decrypting means to decrypt the encrypted digital data by the decryption unit corresponding to the determined encryption method. Trying to control.
[0142]
With such a configuration, even if the received digital data is encrypted with an encryption method having a different security level, a decryption unit corresponding to the encryption method can be selected and decrypted.
The digital data recording apparatus further includes a billing unit that performs billing processing via the digital network, and the control unit selects the decryption unit that decrypts the received encrypted digital data. And a charging value is determined based on the selection of the encryption unit that performs re-encryption, and the charging unit is controlled to perform charging processing based on the determined charging value.
[0143]
With such a configuration, a usage fee corresponding to the decryption and re-encryption of digital data is collected, and the copyright can be protected.
According to another aspect of the present invention, there is provided a digital data recording method for recording digital data on a recording medium, a communication step for receiving encrypted digital data via a digital network, and the encrypted digital data received by the communication step. A decrypting step for decrypting; an encrypting step for encrypting digital data decrypted by one of an encryption method having a plurality of different security levels; and the recording of the digital data encrypted by the encrypting step A recording step of recording on a medium.
[0144]
With such a configuration, digital data encrypted by an encryption method that can be easily reproduced by a reproducing apparatus can be recorded on a recording medium, and the copyright can be protected because it is encrypted. .
The digital data received in the communication step is encrypted with one of encryption methods having different security levels, and the received digital data includes attribute information indicating the encryption method of the digital data. A determination step of determining one encryption method from a plurality of encryption methods based on the attribute information, wherein the decryption step decrypts the digital data encrypted according to the determination step Yes.
[0145]
With such a configuration, the encrypted digital data received by the communication means can be decrypted even if it is encrypted by an encryption method having a different security level.
Further, the present invention provides a computer-readable recording medium applied to a digital data recording apparatus for recording digital data on a first recording medium, wherein the communication step receives encrypted digital data via a digital network; A decryption step for decrypting the encrypted digital data received in the communication step; an encryption step for encrypting the digital data decrypted by one of a plurality of encryption methods having different security levels; and the encryption A computer-readable recording medium recording a program for causing a computer to execute each step of recording the digital data encrypted in the step onto the first recording medium.
[0146]
With such a configuration, digital data encrypted by an encryption method that can be easily reproduced is recorded on a recording medium, and applied to a digital data recording apparatus that does not have a function of protecting copyright. The function can be demonstrated.
Here, the digital data received by the communication step is encrypted with one of encryption schemes having different security levels, and the received data includes attribute information indicating the encryption scheme of the data, A determination step of determining one encryption method from a plurality of encryption methods based on the attribute information, wherein the decryption step decrypts the digital data encrypted according to the determination step; Let's make it run.
[0147]
With such a configuration, the encrypted digital data received by the communication means can be decrypted even if encrypted using encryption methods having different security levels.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of Embodiment 1 of a digital data recording apparatus according to the present invention.
FIG. 2 is an external view showing a hardware configuration of the embodiment and an external view of a recording medium reproducing apparatus obtained in the embodiment.
FIG. 3 is a diagram showing an example of a display screen of a homepage established for purchasing music data according to the embodiment.
FIG. 4 is a diagram showing an example of a data structure of music data downloaded to the primary recording medium in the embodiment.
FIG. 5 is a diagram showing another example of a display screen of a homepage established for purchasing music data according to the embodiment.
FIG. 6 is a first flowchart for explaining the operation of the embodiment;
FIG. 7 is a second flowchart illustrating the operation of the embodiment.
FIG. 8 is a block diagram of Embodiment 2 of a digital data recording apparatus according to the present invention.
FIG. 9 is a diagram showing information displayed on the display unit when a digital signal provided by the information provider of the embodiment is recorded.
FIG. 10 is a flowchart showing the operation of the embodiment.
FIG. 11 is a configuration diagram of Embodiment 3 of a digital data recording apparatus according to the present invention.
FIG. 12 is a diagram showing a data structure of attribute information of a digital signal provided by the information provider of the embodiment.
FIG. 13 is a first flowchart showing the operation of the embodiment.
FIG. 14 is a second flowchart showing the operation of the embodiment.
FIG. 15 is a block diagram of Embodiment 4 of a digital data recording apparatus according to the present invention.
FIG. 16 is a block diagram of Embodiment 6 of a digital data recording apparatus according to the present invention.
FIG. 17 is a diagram illustrating an example of a data structure of attribute information transmitted with digital data according to the embodiment.
FIG. 18 is a diagram illustrating an example of a data structure of management information recorded on the recording medium of the embodiment.
FIG. 19 is a flowchart illustrating the operation of the embodiment.
FIG. 20 is a block diagram of a digital data reproducing apparatus for reproducing the recording medium recorded in the above embodiment.
FIG. 21 is a flowchart for explaining the operation of the digital data reproducing apparatus.
FIG. 22 is a block diagram of Embodiment 7 of a digital data recording apparatus according to the present invention.
FIG. 23 is a diagram illustrating an example of a data structure of attribute information transmitted with digital data according to the embodiment.
FIG. 24 is a flowchart illustrating the operation of the embodiment.
FIG. 25 is a diagram illustrating an example of a data structure of attribute information transmitted with digital data according to a modification of the seventh embodiment.
[Explanation of symbols]
100, 2101 Data transceiver
101 Reception Department
102, 2102 Primary recording medium
103, 2103 Data extractor
104 judgment part
105, 2115 Decryption Department
106 First decoding unit
107 Second decoding unit
108 n-th decoding unit
109 Encryption method indicator
110 Encryption Department
111 First encryption unit
112 Second encryption unit
113 nth encryption unit
114, 2110, 3709 Secondary recording medium
115, 2109, 3108 Recording unit
116, 2802, 3705 Specific information acquisition unit
117 Instruction reception part
118, 3111 Billing Department
201 Personal computer
202 DVD-RAM drive
203 DVD-RAM disc
204 DVD-Audio player
2104 Encryption method determination unit
2105 First decoding unit
2106 Second decoding unit
2107th decoding unit
2108, 3706 encryption unit
2111 Input section
2112, 3104 Display unit
2113 Recording medium specific information acquisition unit
2401 Attribute information acquisition unit
2402 Copy control information detection determination unit
2403 copy control information conversion unit
2404 Accounting information calculation unit
2800 First digital data recording apparatus
2801 Second digital data recording apparatus
2803, 3707 Specific information acquisition and transmission unit
3101 Communication unit
3102 recording medium
3103 Received data record determination unit
3105 Input operation unit
3119 Billing information recording unit
3110 Billing information recording medium
3700 First digital data recording apparatus
3701 First recording medium
3703 Primary recording section
3704 Received data read determination unit
3710 Second digital data recording / reproducing apparatus

Claims (6)

A digital data recording apparatus for recording on a recording medium the digital data for reproducing the reproduction apparatus,
The recording medium includes those that are removable from the playback device and those that are not.
The digital data recording device comprises:
Means for receiving encrypted digital data over a digital network;
Decryption means for decrypting the encrypted digital data received by the communication means;
A plurality of encryption units, and each of the encryption units encrypts digital data with one of encryption methods having different security levels;
Recording means for recording the digital data encrypted by the encryption means on the recording medium;
Control means for controlling the decryption means and the encryption means,
The encryption means includes
A first encryption unit that encrypts digital data with an encryption key generated based on identification information of the recording medium;
A second encryption unit that encrypts digital data with an encryption key generated based on the identification information of the playback device;
The control means determines whether or not the recording medium is detachable from the playback device. If the recording medium is detachable , the control means re-encrypts the digital data decrypted by the decryption means to the first encryption section. A digital data recording apparatus for causing the second encryption unit to re-encrypt the digital data decrypted by the decrypting means when it is impossible to attach and detach ; The digital data recording apparatus further includes:
Charging means for performing charging processing via the digital network;
The control means determines the charging value based on the selection of the encryption unit that performs re-encryption, and controls the charging means to perform charging processing based on the determined charging value. 2. A digital data recording apparatus according to 1. The encryption means further includes:
A third encryption unit for encrypting with an encryption key generated based on a random number;
The control means includes
According the first encryption unit and the second encryption unit may not be able to generate the encryption key, the re-encryption of the received encrypted digital data, characterized in that to perform said third encryption unit The digital data recording apparatus according to claim 1 or 2 .   The digital data encrypted by a plurality of encryption units included in the encryption unit has a security level lower than that of the digital data received by the communication unit. Digital data recording device. A digital data recording method applied to a digital data recording apparatus for recording digital data to be reproduced by a reproducing apparatus on a recording medium ,
The recording medium includes those that are removable from the playback device and those that are not.
The digital data recording method includes:
A communication step of receiving encrypted digital data over a digital network;
A decryption step of decrypting the encrypted digital data received by the communication step;
An encryption step for encrypting the digital data decrypted by one of the encryption methods having a plurality of different security levels;
A recording step of recording the digital data encrypted by the encryption step on the recording medium ;
A control step for controlling the decryption step and the encryption step,
The encryption step includes
A first encryption step of encrypting digital data with an encryption key generated based on the identification information of the recording medium;
A second encryption step of encrypting digital data with an encryption key generated based on the identification information of the playback device;
The control step determines whether or not the recording medium is detachable from the playback device. If the recording medium is detachable, the re-encryption of the digital data decrypted by the decryption step is referred to as the first encryption step. A digital data recording method characterized in that the second encryption step causes the second encryption step to re-encrypt the digital data decrypted in the decryption step . A computer-readable recording medium applied to a digital data recording apparatus for recording digital data to be reproduced by a reproducing apparatus on a first recording medium ,
The first recording medium includes those that are removable from the playback device and those that are not.
A communication step of receiving encrypted digital data over a digital network;
A decryption step of decrypting the encrypted digital data received by the communication step;
An encryption step for encrypting the digital data decrypted by one of the encryption methods having a plurality of different security levels;
A recording step of recording the digital data encrypted in the encryption step on the first recording medium ;
A control step for controlling the decryption step and the encryption step,
The encryption step includes
A first encryption step of encrypting digital data with an encryption key generated based on the identification information of the first recording medium;
A second encryption step of encrypting digital data with an encryption key generated based on the identification information of the playback device;
The control step determines whether or not the first recording medium is removable from the playback device. If the first recording medium is removable, the re-encryption of the digital data decrypted by the decryption step is performed by the first encryption. A computer-readable recording medium storing a program for causing a computer to execute each step for causing the second encryption step to re-encrypt the digital data decrypted by the decryption step. Possible recording media.

Images