JP3824575B2 - DIGITAL BROADCAST RECEPTION DEVICE, RECEPTION METHOD, AND DIGITAL BROADCAST TRANSMISSION METHOD - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to digital broadcasting, and more particularly to a receiving apparatus using copy generation control information .
[0002]
[Prior art]
In general, in digital broadcasting, in many cases, control information regarding whether or not copying of a program is permitted is transmitted as program-related information together with video and audio streams constituting the program. The transmitted copy control information is used to determine whether recording is possible when a program is recorded on a recording device such as D-VHS.
[0003]
As an example of this copy control information, FIG. 14 shows a syntax structure of a digital copy control descriptor described in ARIB STD-B10 version 1.2, which defines program arrangement information used for digital broadcasting such as BS / CS. . In this, there is a 2-bit field indicating copy generation control information called digital_recording_control_data, and as shown in FIG. 15, “00”, “01”, “10”, and “11” can be copied unconditionally, Defined by the operator, meaning that only one generation can be copied and copy prohibited.
[0004]
In the limited reception program, program control information may be included in an ECM (Entitlement Control Message) to be transmitted, and recording control information regarding whether recording is possible may be included therein. According to ARIB STD-B25 1.0, which defines the limited reception system for BS digital broadcasting, the recording control field (in response to a contract confirmation command, which is one of commands / responses between an IC card and an IRD based on ECM, 8 bits). As shown in FIG. 16, 3 bits sandwiching 1 bit among them means that recording is not possible, only the contractor can record, and recording is possible. Based on these pieces of information, the receiver determines whether or not the target program can be recorded, and executes processing.
[0005]
By the way, recently, a time-shifted viewing of a program is one of the prominent functional items when a storage medium such as a hard disk that can be randomly accessed is installed in a receiver. As shown in FIG. 17, time-shifted viewing is a function for reproducing and viewing a program from the beginning at an arbitrary time while continuing to record the program being broadcast. In this example, if the viewer has scheduled recording of program A from 8:00 PM, playback and viewing of program A from any time, for example, 8:30 PM, without waiting for the program to end at 9:30 PM Can start.
[0006]
This time-shift viewing can be realized as long as the recording can be temporarily performed without depending on the permanent recording of the program. Further, unlike normal program recording, it can be realized even if there is a certain degree of limitation in reproduction, for example, a reproducible period or a reproducible number of times.
[0007]
However, as described above, the contract confirmation information based on copy control information, ECM, and the like can be reproduced without limitation if recording is possible, and only real-time viewing is possible if recording is impossible. For this reason, even a function that assumes temporary recording / temporary playback such as time-shifted viewing can be realized only with a recordable program, which cannot fully reflect the intention of the content provider, and also has a limited benefit for the viewer Become.
[0008]
As described above, when a function that can be realized by temporary recording / temporary reproduction such as time-shifted viewing is implemented in the receiver, the conventional system can implement only a program that can be recorded and is not reproduced. However, there is a problem that the viewer's profit is limited.
[0009]
[Problems to be solved by the invention]
As described above, in the conventional copy control method for performing recording control such as recording / recording for the limited reception program of digital broadcasting, there is no copy control for temporary recording for time shift viewing and the like. Therefore, there has been a problem that appropriate copy control that is satisfactory from the viewpoint of both the content supplier and the viewer is not performed.
[0010]
Accordingly, an object of the present invention is to provide a digital broadcast receiving method , a receiving apparatus, and the like in which appropriate copy control is performed for temporary recording of a limited reception program of digital broadcast.
[0011]
[Means for Solving the Problems]
To achieve the above object, according to the basic feature of the present invention, a program receiving means for receiving a conditional access program for digital broadcasting, and a conditional access related information reception for receiving conditional access related information of the conditional access program. means and the conditional access related information copy permitted / copy permission of only one generation / copy copy generation control information and definitive playback the conditional access program of the digital broadcast showing the banned, viewable by tracing back from the time point of currently broadcast Shiftable time acquisition means for acquiring shiftable control information indicating shiftable time, recording control means for recording the limited reception program on a recording medium, and the copy generation control information of the limited program recorded on the recording medium Reproduction means for playing back only within the shiftable time of the limited program when copy prohibition is indicated. To provide a digital broadcast receiver.
[0012]
Therefore, according to the present invention, it is possible to perform appropriate copy control according to the copy generation control information while improving the convenience for the viewer based on the shiftable information reflecting the intention of the content supplier .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
In this embodiment of the present invention, program arrangement information (digital copy control descriptor) is used to transmit information about whether or not a program can be temporarily recorded. It is what you receive.
[0014]
As the program arrangement information, any one of PMT (Program Map Table), EIT (Event Information Table), and SDT (Service Definition Table) can be used.
[0015]
FIG. 1 shows a basic configuration example of a digital broadcast transmission apparatus according to this embodiment.
[0016]
This transmission apparatus includes an MPEG video encoder 11 and an MPEG / AC3 audio encoder 12 that encode video and audio, a scrambler 13 and a scrambler 17 that scramble the encoded video and audio, and video. A scramble key generator 14 and a scramble key generator 18 for generating a voice scramble key, a work key generator 110 for generating a work key used when encrypting the scramble key, and an output of the generator is encrypted. An EMM generator 111 that generates an EMM (Entitlement Management Message), an ECM generator 16 that generates an ECM (Entitlement Control Message) by encrypting a scramble key and a work key, an ECM generator 19, and control information related to temporary recording Temporary recording control information setting unit 112 for defining and setting program related information generating program related information And 113, a multiplexer 15 for multiplexing the information, the FEC encoder 114 for error correction encoding the multiplexed signals, consisting of the modulator 115. modulating the encoded signal.
[0017]
The video and audio signals of the digital broadcast program are input to the MPEG video encoder 11 and the MPEG / AC3 audio encoder 12, respectively. The video signal is encoded by the MPEG video encoder 11 and output to the scrambler 13. In the scrambler 13, the video signal encoded based on the scramble key generated from the scramble key generator 14 is scrambled and output to the multiplexer 15.
[0018]
At this time, the scramble key generated from the scramble key generator 14 is also input to the ECM generator 16, encrypted to generate an ECM, and output to the multiplexer 15 as common information.
[0019]
Similarly, the audio signal is output to the multiplexer 15 via the scrambler 17. Further, the scramble key at this time is generated by the scramble key generator 18 and is encrypted by the ECM generator 19 to generate an ECM, which is also output to the multiplexer 15.
[0020]
Further, a work key used when encrypting these scramble keys is generated by the work key generator 110, encrypted by the EMM generator 111 to generate an EMM, and output to the multiplexer 15 as individual information.
[0021]
Now, the temporary recording control information regarding the program is set by the temporary recording control information setting unit 112 and output to the program related information generator 113. The program-related information generator 112 converts this information and other program-related information into a transmission format called a descriptor and a section, and outputs it to the multiplexer 15.
[0022]
Here, FIG. 3 shows an example when the copy control information related to the temporary recording is also set (additional definition) in the digital copy control descriptor. In the digital copy control information (2 bits) of the same descriptor, “01” corresponding to the operator definition is defined as “copy prohibited and only temporary recording allowed”.
[0023]
Also, in order to ensure consistency with the conventional definition for other values, it is defined that temporary recording is possible if copying is possible, and temporary recording is impossible if copying is prohibited.
[0024]
The multiplexer 15 assigns an identifier called PID (Packet ID) to each input stream, divides and multiplexes the packets into fixed-length packets of 188 bytes, and FEC (error correction) as a transport stream (hereinafter referred to as TS). The data is output to the encoder 114.
[0025]
In the FEC encoder 114, the input TS is encoded by convolutional encoding such as Viterbi code or RS (Reed Solomon) encoding, and output to the modulator 115. The modulator 115 performs, for example, digital modulation processing such as QAM and QPSK, and after D / A conversion, is converted to a high frequency (RF) and output as a broadcast signal.
[0026]
Next, FIG. 2 shows an example of a basic configuration of a digital broadcast receiving apparatus (hereinafter referred to as IRD) transmitted by the above-described transmitting apparatus.
[0027]
A high-frequency digital broadcast signal input from the antenna terminal is input to the demodulator 21 via a tuner (not shown). After A / D conversion, the demodulator 21 demodulates a signal that has been digitally modulated on the transmission side, such as QAM or QPSK, and outputs the demodulated signal to an FEC (error correction) decoder 22.
[0028]
The FEC decoder 22 decodes the convolutional encoding such as Viterbi code or RS (Reed Solomon) encoding on the transmission side, and outputs the decoded signal to the descrambler 23. The descrambler 23 descrambles the scrambled video and audio signals of the designated program based on the scramble key, and outputs the descrambler 23 to the transport processor 25 via the selector 24.
[0029]
In the transport processor 25, a predetermined service designated by a broadcast program selector 26 such as a remote controller is selected from a plurality of services (broadcast programs) that have been multiplexed in the TS format. The video and audio signals to be configured are demultiplexed, depacketized, returned to the respective compressed signals, and output to the MPEG video decoder 27 and the MPEG / AC3 audio decoder 28.
[0030]
The transport processor 25 also separates program-related information such as PSI (Program Specific Information) and SI (Service Information) multiplexed together with video and audio and outputs them to the program-related information player 29.
[0031]
Then, the MPEG video decoder 27 decodes the signal encoded by the MPEG2 video high efficiency encoding method while storing the decoded video frame in a DRAM (not shown), and Y, Cb, Cr Are output as a digital component signal, and are superposed on the graphic output of the OSD processor 210 and added by the adder 211 if necessary.
[0032]
Similarly, the audio is decoded by the MPEG / AC3 audio decoder 28 and output.
[0033]
When this IRD is analog output, the video output of the adder 211 is converted into an NTSC analog composite signal via an NTSC encoder, for example, although not shown. The output of the MPEG / AC3 audio decoder 28 is output to an audio D / A converter and output as an analog audio signal.
[0034]
In order to appropriately perform these signal processing, a microcontroller 212 is prepared and supports peripheral devices. The microcontroller 212 analyzes the PSI data reproduced by the program related information regenerator 29 according to the service designation input from the broadcast program selector 26 or the like, for example, such as video and audio constituting the designated service (program). Each transmission identifier is set in the transport processor 25.
[0035]
Further, the related information necessary for the descrambling process is analyzed, and this PID is set in the descrambler 23. Further, it controls playback operations of peripheral circuits such as the MPEG video decoder 27, the MPEG / AC3 audio decoder 28, the program related information player 29, and the OSD processor 210. In particular, the OSD processor 210 instructs the microcontroller 212 to process and edit data held and managed by the program-related information player 29 as necessary, and to execute an EPG (electronic program guide) display.
[0036]
In this IRD, a recording / reproducing device 213 is connected via a digital interface 214.
[0037]
When the recording program selector 217 such as a remote controller designates the start of recording a program of a specific service from the multiplexed signal of the received digital broadcast, the microcontroller 212 that has received this notification is in the case of real-time reproduction of the broadcast signal. Similarly, the designated program related information is analyzed, and each transmission identifier is set in the transport processor 25 and the descrambler 23. As a result, the transport processor 25 demultiplexes the necessary signals and outputs them to the recording / reproducing apparatus 213 via the digital interface 214.
[0038]
In DVB, when selecting (multiple) a program as described above and recording (this stream is called a partial TS), storage related information called SMI (Storage Media Interoperability Table) is created by IRD, It is specified that it is inserted in place of the above SI.
[0039]
There are two types of SMIs: SIT (Selection Information Table) describing information of programs selected for recording and DIT (Discontinuity Information Table) describing discontinuity information of SI.
[0040]
The SIT is created in the SIT creator 221 by extracting and editing only information related to the program or service selected and recorded from the SI multiplexed in the broadcast signal by the selection information creator. Multiplexed inside.
[0041]
The DIT is also inserted into the recording stream as indicating this when the SI information can be discontinuous by the DIT creator 222.
[0042]
In the case of reproduction processing, both the selector 24 and the recorded program selector 215 select and output the input on the recording / reproduction processing side. In the transport processor 25, as in the case of broadcast reception and reproduction, a video that constitutes a program by selecting a predetermined service designated by a recorded program selector 216 such as a remote controller from among the multiplexed signals in the TS format. And the audio signal are demultiplexed, depacketized, converted back to their respective compressed signals, and output to the MPEG video decoder 17 and the MPEG / AC3 audio decoder 28. Also, PSI and SIT program-related information multiplexed together with video and audio are separated and output to the program-related information player 29.
[0043]
Here, the recording control process and the reproduction control process in the IRD will be described in detail below.
[0044]
Regarding the recording process, the above-described microcontroller 212 controls the recording of the program in the procedure as shown in FIG.
[0045]
First, when a recording start instruction is accepted in step S41, the digital copy control information is referenced in step 42, and the process proceeds to step S43. If the value of the digital copy control information is not “11” (copy prohibited and temporary recording not possible) in step S43, the process proceeds to step S44.
[0046]
In step S44, it is detected whether the digital copy control information is “10” (only one generation can be copied and temporary recording is possible). If the digital copy control information is “10”, copy generation management processing is performed in step S45, and recording processing is executed in step S46.
[0047]
If “11” in step S43, it means that recording is not possible as shown in FIG. 3. In step S47, recording impossible processing such as OSD (On Screen Display) display is executed. The recording process continues until a recording stop instruction is received.
[0048]
Next, regarding the reproduction process, the microcontroller 212 controls the reproduction of the temporarily recorded program according to the procedure shown in FIG. First, in step S51, a shiftable time Smax determined in advance between the transmitting and receiving apparatuses is set. When a reproduction start instruction is accepted in step S52, the current time is compared with the broadcast end time in step S53.
[0049]
In step S53, if the current time has not reached the broadcast end time, the process proceeds to step S54, where the shift range Ts, that is, (current time-broadcast start time) and (shiftable time) are compared, and the smaller value is obtained. Taken.
[0050]
For example, if the shiftable time is 30 minutes and a certain program starts broadcasting at 9:00 PM or is currently 9:40 PM, (current time−broadcast start time), that is, the broadcast elapsed time is 40 minutes. Since the possible time is shorter, the shift range Ts is 30 minutes.
[0051]
Next, the process proceeds to step S55, where it is detected whether the current reproduction position is greater than (current time-shift range) and less than or equal to the current time. That is, reproduction can be performed in the range of 9:10 PM to 9:40 PM. Therefore, the process moves to step S56, and time-shift viewing can be performed from 9:10 PM.
[0052]
On the other hand, in step S53, if the current time has passed the broadcast end time, the broadcast has already ended. Therefore, the temporary recording is not performed, and the temporary recording data is deleted in step S57.
[0053]
As described above, by recording the temporary recording control information in the program arrangement information (digital copy control descriptor) and transmitting it, the receiver can perform playback control of the temporary recording of the program according to this information.
[0054]
In this embodiment, the program arrangement information transmitted together with the normal digital broadcast program is also used as temporary recording control information, so that it is not necessary to add a new signal.
(Embodiment 2)
In the above embodiment, the temporary recording means a case where reproduction starts before the recording is completed. However, the temporary recording is not limited to this, and the case where the reproduction expiration date is set and the reproduction is performed before that may be interpreted as the temporary recording. Next, a description will be given of an embodiment of this type that transmits temporary record availability information by limited reception related information. In other words, information on whether or not temporary recording can be performed is transmitted from the transmission device using limited reception related information, and the program for which temporary recording is permitted is restricted by the reproduction expiration date in the reception device.
[0055]
An example of the basic configuration of the transmission apparatus in this embodiment is shown in FIG.
[0056]
The control information relating to temporary recording defined and set by the temporary recording control information setting unit 612 is different from the embodiment shown in FIG. 1 only in that it is output to the ECM generator 66 and the ECM generator 69. The ECM generator 66 and the ECM generator 69 set 1-byte recording control information including temporary recording control as shown in FIG. 7 together with the encrypted scramble key and output it to the multiplexer 65.
[0057]
In this example, the control information related to temporary recording defined and set by the temporary recording control information setting unit 612 is not output to the program related information generator 613, but the temporary recording control information of the program is added to the ECM and the program arrangement information. Each may be set appropriately.
[0058]
Further, the basic configuration of this receiving apparatus is the same as that in FIG. 2 of the first embodiment described above.
The ECM is demultiplexed by the transport processor 25 together with the EMM, and is output as common information and individual information to an IC card (not shown) inserted in the receiver. In the IC card, the encrypted work key and scramble key are decrypted and set in the descrambler 23 to enable descrambling processing such as video and audio.
[0059]
FIG. 8 shows a recording control procedure in this embodiment.
First, when an instruction to start recording is received in step S81, a contract confirmation command based on ECM reception is issued in step S82. Next, in step S83, a response from the IC card is received and the recording control information is referred to.
[0060]
In step S84, if the value of the recording control information is “0x00”, it means that recording is impossible from FIG. 7, so that the process moves to step S85, and recording disable processing such as displaying on the display that recording is impossible is performed. .
[0061]
If the value of the recording control information is not “0x00” in step S84, the process proceeds to step S86, and it is detected whether it is “0x10”. In step S86, if the value of the recording control information is “0x10”, it means that recording is possible from FIG. 7, and the process proceeds to step S87 to perform recording processing.
[0062]
If the value of the recording control information is not “0x10” in step S86, the process proceeds to step S88, and it is detected whether it is “0x02”. If the value of the recording control information in step S88 is “0x02”, it means that temporary recording is possible according to FIG. 7, and the process proceeds to step S89 to perform temporary recording processing.
[0063]
If the value of the recording control information is not “0x02” in step S88, the process proceeds to step S810, and it is detected whether it is “0x01”. If the value of the recording control information is “0x01”, it is possible to record only the contractor from FIG. 7, so that the process proceeds to step S811, and the viewer selects and inputs whether or not to purchase the corresponding program by OSD display.
[0064]
In step S811, when the viewer inputs to purchase, the process proceeds to step S812, and recording processing is performed. If the viewer does not purchase, the recording process is not performed.
[0065]
If the value of the recording control information is not “0x01” in step S810, the process proceeds to step S813, and it is detected whether it is “0x03”. If the value of the recording control information is “0x03”, the process moves to step S814, and the viewer selects and inputs whether or not to purchase the program by OSD display. If the viewer purchases the program, a temporary recording process is performed in step S815. If the viewer does not purchase, the recording process is not performed.
[0066]
On the other hand, if the value of the recording control information is not “0x03” in step S813, the process proceeds to step S816 to detect whether it is “0x04”. If the value of the recording control information is “0x04”, it means “recording is possible only for the contractor and temporary recording is possible” according to FIG. Select input.
[0067]
When the viewer inputs that the purchase is made in step S817, the process proceeds to step S818 to perform recording processing. If it is not purchased, temporary recording is possible, so the process moves to step S819 to perform temporary recording processing. If the value of the recording control information is not “0x04” in step S816, it does not correspond to any of the cases in FIG. 7, and the process proceeds to step S820 to execute a predetermined error process.
[0068]
Next, the procedure of the reproduction control process in this embodiment will be described with reference to FIG.
First, in step S91, a reproduction expiration date determined in advance between the transmitting device and the receiving device is set. When an instruction to start reproduction is accepted in step S92, the process moves to step S93 to refer to the current date and time, and then in step S94, it is detected whether or not the current date has reached the reproduction expiration date.
[0069]
If it is confirmed in step S94 that the current date and time has not passed the reproduction expiration date, the process proceeds to step S95, and reproduction processing is executed.
[0070]
On the other hand, when it is determined in step S94 that the current date and time has passed the reproduction expiration date, the process proceeds to step S96 to check whether the viewer has updated the viewing contract. When the viewing contract update is confirmed in step S96, the process proceeds to step S97 to refer to the contract content.
[0071]
In step S97, the contract contents are referred to, and in step S98, it is confirmed whether reproduction is permitted. If it is confirmed that the reproduction is possible, the process proceeds to step S99 to execute the reproduction process.
[0072]
If it is confirmed in step S98 that playback is not possible, and if it is confirmed in step S96 that the contract has not been updated by the viewer, the process moves to step S910 to indicate that playback is not possible. Perform non-reproducible processing such as displaying.
[0073]
As described above in this embodiment, the temporary recording control information is described in the conditional access related information from the transmitting device and transmitted, and the receiving device follows the temporary recording control information included in the conditional access related information. It is possible to perform playback control of temporary recording of programs.
[0074]
It is also possible to define temporary recording as viewing during a period that does not exceed the reproduction expiration date. It is also possible to make it possible to replay a temporarily recorded program that has been forbidden to be played once the limit has been exceeded, by renewing the viewing contract.
(Embodiment 3)
Temporary recording can also be defined as playback less than a predetermined number of times. Also, the temporary recording control information can be transmitted independently.
[0075]
In this embodiment, the descriptor is newly defined in the program arrangement information and the temporary recording control information is transmitted from the transmitting device, and the receiving device restricts the reproduction when the reproduction of the program permitted to be temporarily recorded exceeds a predetermined number of times. receive.
[0076]
The configurations of the transmission device and the reception device are the same as those in FIGS.
[0077]
On the transmission side, for example, in the program related information generator 113 based on the output of the temporary recording control information setting unit 112 shown in FIG. 1, a descriptor as shown in FIGS. 10 (a) (b) (c) is defined. create.
[0078]
The created descriptor is described in a corresponding table section such as PMT and EIT, and is output to the multiplexer 15. This newly defined and created descriptor is referred to herein as a temporary recording control descriptor.
[0079]
Here, the temporary recording control descriptor temporal_digital_recordability_flag in FIG. 10A indicates whether or not temporary recording is permitted. For example, when this 1 bit is “0” as shown in FIG. When “1”, temporary recording is permitted.
[0080]
The num_of_replay field in FIG. 10A is the number of reproducible times (0 to 15) when the target program is temporarily recorded, and is set on the transmission side.
[0081]
The over_process_control field in FIG. 10A defines the process when the temporarily recorded program exceeds the num_of_replay defined as described above, and is also set on the transmission side. As shown in FIG. 10C, when this value is “010”, it means that the reproduction of the temporarily recorded program is limited in time. Therefore, in this case, playback is limited in time, and display control parameters as shown in FIG. 11 are set.
[0082]
In FIG. 11, partial_replay_unit is a unit of partial reproduction from the start of the program of the temporarily recorded program, and this cycle is repeated until the end of the program. Here, partial_replay_on_time defines the display time within the partial_replay_unit period, and partial_replay_off_time defines the subsequent non-display time.
[0083]
On the other hand, on the receiving side, the program related information including the temporary recording control descriptor is reproduced and analyzed by the program related information regenerator 29 shown in FIG. This procedure will be described with reference to FIG. The digital copy control information in this case is determined based on FIG. 3 except for the case of “11”.
[0084]
First, when a recording start instruction is accepted in step S121, the digital copy control information described in the digital copy control descriptor is referred to in step S122.
[0085]
In step S123, it is checked whether the value of this digital copy control information is “11”. In step S123, if the value of the digital copy control information is not “11” indicating copy prohibition, the process proceeds to step S124, and it is checked whether or not this value is “10”.
[0086]
In step S124, if the value of the digital copy control information is “10”, it means “only one generation can be copied” from FIG. 3. Therefore, copy generation management processing is performed in step S125, and then in step S126. Execute the recording process.
[0087]
On the other hand, if the value of the digital copy control information is “11” in step S123, the temporary recording control descriptor temporal_digital_recordability_flag in FIG. 10A is checked in step S127.
[0088]
If the temporary recording control descriptor temporal_digital_recordability_flag is “1” in step S127, the process proceeds to step S128 to execute temporary recording processing.
[0089]
If the temporary recording control descriptor temporal_digital_recordability_flag is not “1” in step S127, the process proceeds to step S129, and recording disable processing such as displaying on the screen screen that recording is not permitted is executed.
[0090]
Note that the recording processing routine continues to be executed until a recording stop instruction is received.
[0091]
Next, the procedure of reproduction control in the case of this temporary recording will be described with reference to FIG.
[0092]
First, in step S131, the reproducible number of times specified by the num_of_replay field of the temporary recording control descriptor is set, and in step S132, the number of times of reproduction is reset to zero.
[0093]
When an instruction to start reproduction is accepted in step S133, the process proceeds to step S134, and the number of reproductions RN and the number of possible reproductions RNmax are compared. In step S134, if the number of reproductions RN is equal to or less than the reproducible number RNmax, the process proceeds to step S135, the normal reproduction process is executed, and then the process proceeds to step S136 to increment the reproduction number RN.
[0094]
In step S134, when the number of reproductions RN exceeds the number of possible reproductions RNmax, the process proceeds to step S137, and it is checked whether or not the value of the over_process_control field is “000”.
[0095]
If the value of the over_process_control field is “000” in step S137, it means “deletion of temporarily recorded program data” according to FIG. 10C, and the process proceeds to step S138 to delete the temporarily recorded data. .
[0096]
On the other hand, if the value of the over_process_control field is not “000” in step S137, the process proceeds to step S139, and it is checked whether or not this value is “001”. In step S139, if the value of the over_process_control field is “001”, it means “prohibition of reproduction of temporarily recorded program” according to FIG. 10C. Therefore, the process proceeds to step S1310 to execute reproduction inhibition processing. .
[0097]
If the value of the over_process_control field is not “001” in step S139, the process proceeds to step S1311 to check whether the value of the over_process_control field is “010”.
[0098]
In step S1311, if the value of the over_process_control field is “010”, it means “temporarily restrict the playback of the temporarily recorded program” from FIG. 10C. Therefore, in step S1312, according to the parameter setting of FIG. Perform partial playback on the program to achieve effect control. That is, the screen is played back every predetermined time, and the viewer is again contracted to feel like viewing the complete playback image.
[0099]
In this example, the partial reproduction of time has been described as an example. However, reproduction is limited spatially, that is, only a part of the screen can be seen, or the resolution is limited and the reproduction is blurred. You may do it.
[0100]
In this embodiment, the temporary recording control information is defined from the transmission side and described in the program arrangement information and transmitted from the transmission side, and the receiving apparatus can perform the temporary recording and reproduction control of the program according to this information. In this embodiment, effect control can also be performed when the limit on the number of reproductions is exceeded.
[0101]
As described above, temporary recording can be defined as playback from a point in time before the end of recording, playback before the playback expiration date, or when playback is less than a predetermined number of times. .
[0102]
The temporary recording control information can be transmitted in addition to the information for controlling the recording of the digital broadcast program, and the information for controlling the recording of the digital broadcast program that is limitedly received. In addition to the above, it can be transmitted with meaning, or can be transmitted independently as recording control information for temporary recording. The method of sending the temporary recording control information and the definition of the temporary recording can be selected completely independently.
[0103]
In general, it is possible to decide in advance between the transmitting and receiving apparatuses what the temporary recording is, or to send the definition from the transmitting side to the receiving side prior to the control information. In addition, when no temporary recording control information is sent, it is possible to determine in advance how to interpret the information.
[0104]
【The invention's effect】
According to the present invention, a suitable copy control for record conditional access digital broadcast program is made, it is possible to provide a receiving apparatus and a receiving method thereof of the digital broadcast. Therefore, it is possible to easily realize a function such as time shift viewing on the receiving side in many programs by reflecting the intention of the content supplier.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of a transmission device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a configuration example of a receiving device according to an embodiment of the present invention.
FIG. 3 is a diagram for explaining an example of the meaning of digital copy control information according to an embodiment of the present invention.
FIG. 4 is a diagram for explaining a recording control interpretation procedure according to an embodiment of the present invention;
FIG. 5 is a view for explaining a reproduction control interpretation procedure in the embodiment of the present invention.
FIG. 6 is a diagram illustrating a configuration example of a transmission device according to another embodiment of the present invention.
FIG. 7 is a diagram for explaining an example of the meaning of recording control information in another embodiment of the invention.
FIG. 8 is a diagram for explaining a recording control interpretation procedure according to another embodiment of the invention.
FIG. 9 is a diagram for explaining a playback control interpretation procedure according to another embodiment of the present invention.
FIG. 10 is a diagram for explaining an example of the structure of a temporary recording control descriptor according to still another embodiment of the present invention.
FIG. 11 is a view for explaining partial reproduction in time according to still another embodiment of the present invention.
FIG. 12 is a diagram for explaining a recording control interpretation procedure according to still another embodiment of the present invention.
FIG. 13 is a diagram for explaining a playback control interpretation procedure according to still another embodiment of the present invention.
FIG. 14 is a diagram for explaining an example of a syntax structure of a conventional digital copy control descriptor.
FIG. 15 is a diagram for explaining an example of conventional digital copy control information.
FIG. 16 is a diagram for explaining an example of recording control information of conventional conditional access broadcasting.
FIG. 17 is a diagram for explaining conventional time-shift viewing;
[Explanation of symbols]
11, 61 ... MPEG video encoder, 12, 62 ... MPEG / AC3 audio encoder, 13, 17, 63, 67 ... scrambler, 14, 18, 64, 68 ... scrambled Key generator, 15, 65 ... Multiplexer, 16, 19, 66, 69 ... ECM generator, 21 ... Demodulator, 22 ... FEC decoder, 23 ... Descrambler , 24 ... selector, 25 ... transport processor, 26 ... broadcast program selector, 27 ... MPEG video decoder, 28 ... MPREG / AC3 audio decoder, 29 ... Program related information player 110, 610 ... Work key generator 111, 611 ... EMM generator 112: Temporary recording control information setting unit 113 ... Program related information generator 114 614 FEC encoding 115, modulator, 210, OSD processor, 211, adder, 212, microcontroller, 213, recording / playback device, 214, digital interface, 216, playback Program selector, 221... SIT creator, 222.

Claims (3)

Program receiving means for receiving a digital broadcast limited reception program;
Limited reception related information receiving means for receiving limited reception related information of the limited reception program;
The conditional access related information copy permitted / copy permission of only one generation / copy copy generation control information and the digital broadcast definitive re raw conditional access programs showing the banned, shiftable time viewable back from the time point of currently broadcast Shiftable time acquisition means for acquiring shiftable control information indicating:
Recording control means for recording the conditional access program on a recording medium;
And a playback means for playing back only within the shiftable time of the limited program when the copy generation control information of the limited program recorded on the recording medium indicates copy prohibition. Broadcast receiving device.   2. The digital broadcast receiving apparatus according to claim 1, further comprising record deletion means for deleting a record of the program other than the shiftable time. A program receiving step of receiving a digital broadcast limited reception program;
A limited reception related information receiving step of receiving limited reception related information of the limited reception program;
The conditional access related information copy permitted / copy permission of only one generation / copy copy generation control information and the digital broadcast definitive re raw conditional access programs showing the banned, shiftable time viewable back from the time point of currently broadcast A shiftable time acquisition step of acquiring shiftable control information indicating:
A recording control step of recording the conditional access program on a recording medium;
And a playback step of playing back only within the shiftable time of the limited program when the copy generation control information of the limited program recorded on the recording medium indicates copy prohibition. Broadcast receiving method.

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