JP5372998B2 - Mobile communication terminal, information distribution method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To deliver a received entity file to another program. <P>SOLUTION: Receiving means 11 receives data (file group) from a broadcast server 20. The file group is wholly encrypted in a first encryption method and includes a control file and content (entity file). The content is encrypted in a second encryption method that is different from the first encryption method. Decryption means 12 decrypts (decodes) data encrypted by the first encryption method. Determination means 13 determines which application program is to be a delivery destination of the content on the basis of the decrypted control file. Delivery means 15 performs delivery processing for delivering the content to an application program (another application program) of the delivery destination determined by the determination means 13. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a technique for distributing data by broadcasting.

  A technique for distributing data by broadcasting is known. Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for further distributing content encrypted with a first encryption key with a second encryption key and then distributing the content as broadcast content. On the receiving side, decryption is performed using the second encryption key.

JP 2009-245463 A

Also according to Patent Document 1, the content (substance file) received by broadcasting cannot be transferred to another program.
On the other hand, the present invention provides a technique for delivering a received entity file to another program.

The present invention receives a file group encrypted by a first encryption technique and including a control file and an entity file encrypted by a second encryption technique different from the first encryption technique. A receiving means, a decrypting means for decrypting the data encrypted by the first encryption technique, and another program specified based on a control file included in the file group decrypted by the decrypting means, There is provided a mobile communication terminal having delivery means for performing delivery processing for delivering the entity file.
According to this mobile communication terminal, an entity file that is doubly encrypted by the first encryption method and the second encryption method can be delivered to another program based on the control file.

In a preferred aspect, the mobile communication terminal has a determination unit that determines a program to which the entity file is transferred based on the control file, and the transfer unit is a program determined to be a transfer destination by the determination unit. May be performed as the other program.
According to this mobile communication terminal, the entity file can be delivered to the delivery destination program determined based on the control file.

In another preferable aspect, the control file includes the type of the entity file, the identifier of the second encryption method, or the identifier of the second program as cooperation destination information, and the determination unit includes the cooperation destination information in the cooperation destination information. Based on this, the delivery destination program may be determined.
According to this mobile communication terminal, the entity file can be delivered to the delivery destination program that is cut off based on the type of the entity file, the identifier of the second encryption method, or the identifier of the second program.

In yet another preferred aspect, the mobile communication terminal communicates with a storage device storing the first program and the second program, a processor executing the first program or the second program, and another device. The first program includes an instruction group for causing the processor, the storage device, and the communication unit to function as the decoding unit, and the other program is the second program. The control file includes an address of a specific server on the network, and the second program accesses the specific server indicated by the address included in the control file to the processor, the storage device, and the communication unit. A group of instructions for functioning as a confirmation means for confirming whether or not the entity file can be used. Or it may be you.
According to this mobile communication terminal, the right to use the entity file can be confirmed in the second program.

In still another preferred aspect, the storage device further stores a third program, and the third program is received by the reception unit and the reception unit, the processor, the storage device, and the communication unit. And a calling unit that calls the decoding unit to decode the file group, and an instruction group for causing the decoding unit to function as the delivery unit. The decoding unit performs the decoding when called from the third program. , Storing the combined file group in the storage device, notifying the third program of the address where the file group is stored in the storage device, and notifying the delivery process from the decoding means A process of notifying the second program of the received address may be included.
According to this mobile communication terminal, the entity file decrypted by the first program can be delivered from the third program to the second program.

In still another preferred aspect, the first program includes an instruction group for causing the processor and the storage device to function as check means for checking the control file for falsification and notifying the third program of the check result. May be included.
According to this mobile communication terminal, it is possible to check for falsification of the control file in a program or device higher than the first program.

In still another preferred aspect, the second program includes an instruction group for causing the processor and the storage device to function as check means for checking the control file for falsification and notifying the third program of the check result. May be included.
According to this mobile communication terminal, it is possible to check for falsification of a control file in a program or device higher than the second program.

The present invention also provides a file group that is encrypted by the first encryption technique and includes a control file and a substance file that is encrypted by a second encryption technique different from the first encryption technique. Receiving the real file, decrypting the data encrypted by the first encryption method, and other program specified based on the control file included in the decrypted file group And a delivery process for delivering the information.
According to this information distribution method, the content double-encrypted by the first encryption method and the second encryption method can be delivered to another program according to the contents of the control file.

Furthermore, the present invention is a file group encrypted by a first encryption method on a computer, and includes a control file and an entity file encrypted by a second encryption method different from the first encryption method. A step of receiving a group, a step of decrypting the data encrypted by the first encryption method, and another program identified based on a control file included in the decrypted file group, Provided is a program for executing a delivery process for delivering an entity file.
According to this program, the content double-encrypted by the first encryption method and the second encryption method can be delivered to another program according to the contents of the control file.

  According to the present invention, content that has been double-encrypted by the first encryption method and the second encryption method can be delivered to another program according to the contents of the control file.

The figure which shows the function structure of the content delivery system 1 which concerns on one Embodiment. 1 is a diagram showing a hardware configuration of a mobile communication terminal 10. FIG. The figure which shows the hardware constitutions of the broadcast server 20. The figure which shows the hardware constitutions of CP server 30. The figure which shows the hardware constitutions of the authentication server 40. 2 is a diagram showing a software configuration of the mobile communication terminal 10. FIG. The figure which illustrates the composition of the data distributed. The sequence chart which shows the operation | movement which concerns on 1st Embodiment. The sequence chart which shows the operation | movement which concerns on 2nd Embodiment.

1. First embodiment 1-1. Configuration FIG. 1 is a diagram illustrating a functional configuration of a content distribution system 1 according to an embodiment. The content distribution system 1 includes a mobile communication terminal 10, a broadcast server 20, a CP (Contents Provider) server 30, and an authentication server 40. The content distribution system 1 is a system that distributes content using broadcasting. That is, the content distribution system 1 distributes content of the same content from a single broadcast server 20 to a plurality of mobile communication terminals 10. In FIG. 1, only a single mobile communication terminal 10 is shown to prevent the drawing from becoming complicated.

  The mobile communication terminal 10 is a device that receives data (content) via broadcasting and uses the received content. The mobile communication terminal 10 includes a receiving unit 11, a decoding unit 12, a determining unit 13, a checking unit 14, a delivery unit 15, a calling unit 16, a using unit 17, and a confirmation unit 18. Among these, at least the receiving means 11 and the calling means 16 are functions of one application program. At least the use means 17 and the confirmation means 18 are functions of another application program different from this application.

  The receiving unit 11 receives data (file group) from the broadcast server 20. The entire file group is encrypted by the first encryption method, and includes a control file and content (substance file). Among these, the content is encrypted by a second encryption method different from the first encryption method. The calling unit 16 calls the decoding unit 12. The decryption means 12 decrypts (decrypts) the data encrypted by the first encryption method. Based on the decrypted control file, the determination unit 13 determines which application program is the content delivery destination. The check means 14 checks whether the decrypted control file has been tampered with. The delivery unit 15 performs a delivery process for delivering the content to the delivery destination application program (another application program) determined by the determination unit 13. Although not shown in the figure, the mobile communication terminal 10 has UI means for providing a user interface related to reception of data by broadcasting and delivery of data to other applications. The use means 17 uses the delivered content. Specifically, the use means 17 has a function of decrypting general-purpose DRM (an example of the second encryption method) and a function of using the decrypted content. Prior to the use of the content, the confirmation means 18 confirms whether or not the content can be used with the authentication server 40.

  FIG. 2 is a diagram illustrating a hardware configuration of the mobile communication terminal 10. The mobile communication terminal 10. CPU (Central Processing Unit) 110, RAM (Random Access Memory) 120, ROM (Read Only Memory) 130, storage unit 140, communication unit 150, input unit 160, display unit 170, broadcast receiving unit 180, a mobile phone in this example. The ROM 130 is a nonvolatile storage device that stores programs and data. The RAM 120 is a volatile storage device. The CPU 110 is an arithmetic device that executes a program using the RAM 120. The storage unit 140 is a non-volatile storage device that stores data and programs, and includes, for example, a flash memory or an HDD (Hard Disk Drive). The storage unit 140 includes a removable storage medium such as a memory card and a reading device thereof. The communication unit 150 is a device that communicates with another computer connected to a mobile communication network via a base station, and includes, for example, an antenna and an amplifier. The input unit 160 is a device for inputting commands or data to the CPU 110 and includes, for example, a touch panel or a keypad. The display unit 170 is a device that displays characters, images, and the like under the control of the CPU 110, and includes, for example, an LCD (Liquid Crystal Display) or an organic EL (Electro-Luminescence) display. The broadcast receiving unit 180 is a device that receives data by broadcasting, and includes, for example, an antenna and an amplifier.

  FIG. 3 is a diagram illustrating a hardware configuration of the broadcast server 20. The broadcast server 20 is a server for distributing data by broadcasting. The broadcast server 20 is a computer having a CPU 210, a RAM 220, a ROM 230, a storage unit 240, a communication unit 250, an input unit 260, a display unit 270, and a broadcast transmission unit 280. The ROM 230 is a non-volatile storage device that stores programs and data. The RAM 220 is a volatile storage device. The CPU 210 is an arithmetic device that executes a program using the RAM 220. The storage unit 240 is a non-volatile storage device that stores data and programs, and includes, for example, an HDD. The communication unit 250 is a device that communicates with other computers connected to a network such as a mobile communication network, and includes a communication interface, for example. The input unit 260 is a device for inputting commands or data to the CPU 210 and includes, for example, a keyboard. The display unit 270 is a device that displays characters, images, and the like under the control of the CPU 210 and includes, for example, an LCD or an organic EL display. Broadcast transmission unit 280 is a device that transmits data by broadcasting, and includes, for example, an antenna and an amplifier. The broadcast transmission unit 280 (particularly the antenna and the amplifier) is separate from the other elements of the broadcast server 20, but will be described here as elements of the broadcast server 20 for simplicity. In this example, the storage unit 240 stores a program for causing a computer to function as a broadcast server in the content distribution system 1. The broadcast server 20 encrypts data by broadcast DRM (an example of a first encryption method) when distributing data by broadcast.

  FIG. 4 is a diagram illustrating a hardware configuration of the CP server 30. The CP server 30 is a server that provides content to the broadcast server 20. The CP server 30 is a computer having a CPU 310, a RAM 320, a ROM 330, a storage unit 340, a communication unit 350, an input unit 360, and a display unit 370. The function of each element is the same as that of the broadcast server 20. In this example, the storage unit 340 stores a program for causing a computer to function as a CP server in the content distribution system 1. When providing the content to the broadcast server 20, the CP server 30 encrypts the content using general-purpose DRM (Digital Rights Management). Broadcast DRM and general-purpose DRM differ in at least one of an encryption algorithm and an encryption key used. The CP server 30 provides the broadcast server 20 with a set of encrypted content and a plain text control file. The broadcast server 20 and the CP server 30 are connected via a network such as a mobile communication network.

  FIG. 5 is a diagram illustrating a hardware configuration of the authentication server 40. The authentication server 40 is a server that authenticates whether the user has the right to use the content when the content is used. The authentication server 40 is a computer having a CPU 410, a RAM 420, a ROM 430, a storage unit 440, a communication unit 450, an input unit 460, and a display unit 470. The function of each element is the same as that of the broadcast server 20. In this example, the storage unit 440 stores a program for causing a computer to function as an authentication server in the content distribution system 1. The storage unit 440 stores an authentication database for authenticating whether the user has the right to use the content. In the authentication database, a set of a user identifier and a content identifier that the user has the right to use is registered. When receiving a request for authentication from a client (for example, mobile communication terminal 10), the authentication server 40 authenticates whether the user associated with the request has the right to use the content, and transmits the result as a response.

  FIG. 6 is a diagram illustrating a software configuration of the mobile communication terminal 10. In this example, the mobile communication terminal 10 includes a resident 101, a player 102, a renderer 103, and an OS (Operating System) 104. The OS 104 is basic software of the mobile communication terminal 10 and has functions such as process management of application programs. The resident 101 and the player 102 are application programs that operate on the OS 104, and can be freely installed and uninstalled by the user. The renderer 103 is middleware that is called from an application program and operates, and is a so-called native program specialized for the hardware and software platform of the mobile communication terminal 10. The renderer 103, which is middleware, is activated when called from an API (Application Programming Interface). The API is configured to accept only calls from application programs created by a specific person. Resident 101 can call this API.

  In terms of the correspondence with the functional configuration of FIG. 1, in this example, the resident 101 has functions as a reception unit 11, a determination unit 13, a delivery unit 15, and a calling unit 16. The renderer 103 has functions as a decoding unit 12 and a checking unit 14. The decoding unit 12 has a function of decoding the broadcast DRM. The player 102 has use means 17 and confirmation means 18. Therefore, in this example, the CPU 110 executing the program of the resident 101 and other elements controlled by the CPU 110 are examples of the receiving unit 11, the determining unit 13, the delivery unit 15, and the calling unit 16. The CPU 110 executing the program of the renderer 103 and the other elements controlled by the CPU 110 are examples of the decoding unit 12 and the checking unit 14. The CPU 110 executing the program of the player 102 and other elements controlled by the CPU 110 are examples of the use means 17 and the confirmation means 18.

1-2. Operation FIG. 7 is a diagram exemplifying a configuration of distributed data. The distributed data is a file group including content and a control file. The content is an entity file that is a main target of distribution, and is, for example, a moving image, a still image, audio, or an application program file. The control file is a file for controlling content distribution, and includes the address of the authentication server 40 and cooperation destination information. The cooperation destination information is information that directly or indirectly designates the application program that is the content delivery destination. As information for directly designating a delivery destination application program, for example, there is an application program identifier (name or identification number of the application program). Examples of information that indirectly designates a delivery destination application program include a content type or a general-purpose DRM identifier. The content type indicates whether the content is a moving image, a still image, audio, or an application program. The identifier of the general-purpose DRM is information for specifying the general-purpose DRM. The content type and the general-purpose DRM identifier are indicated by, for example, an extension of a file name given to the content. The correspondence between the file extension and the application program is determined by the OS 104.

  FIG. 8 is a sequence chart showing an operation according to the first embodiment of the content distribution system 1. In the following description, software such as the resident 101 and the renderer 103 is described as the subject of processing, but this means that the CPU 110 executing the program performs the processing in cooperation with the RAM 120 and other hardware. means.

  In step S101, the broadcast server 20 distributes data (content) by broadcasting. In step S102, the resident 101 receives data distributed by broadcasting. In step S103, the resident 101 requests the renderer 103 to decrypt the received data. The request to the renderer 103 includes information designating data to be decrypted and information designating a folder for storing the decrypted data. In this example, the OS 104 has a folder-type file storage system, and the storage area in the storage unit 140 is specified by a combination of a folder name and a file name.

  In step S104, the renderer 103 decodes the designated data. The renderer 103 writes the decrypted data in the designated folder. The decrypted data includes a plain text control file and content encrypted with general-purpose DRM. In step S105, the renderer 103 checks whether the control file has been tampered with. This check is performed using, for example, an electronic certificate. When the decryption is completed, the renderer 103 transmits a decryption response indicating that the decryption is completed to the resident 101 that is the decryption request source (step S106). If the control file has not been tampered with, the decryption response includes information indicating that the control file has not been tampered with. When the control file has been tampered with, the decryption response includes information indicating that the control file has been tampered with.

  When receiving the decryption response, the resident 101 determines to which other application program the content is to be delivered (step S107). This determination is made as follows, for example. The resident 101 reads cooperation destination information included in the decrypted control file. The resident 101 identifies the application program (in this example, the player 102) specified by the cooperation destination information as the data delivery destination program. If the decryption response indicates that the control file has been tampered with, the resident 101 notifies the user that the control file has been tampered with, and ends the process of FIG.

  In step S <b> 108, the resident 101 performs a delivery process for delivering the content to the player 102. In this example, the delivery process includes a process of notifying the player 102 of information (folder name and file name) specifying an area where the decrypted content is stored. Specifically, the resident 101 requests the OS 104 to start the player 102. This request includes information for specifying an area in which the decrypted content is stored. When receiving the request, the OS 104 activates the player 102.

  The activated player 102 checks whether the user has the right to use the specified content (step S109). This confirmation process includes the following processes. In step S <b> 110, the player 102 transmits an authentication request to the authentication server 40. Specifically, first, the player 102 reads the address of the authentication server 40 included in the control file stored in the designated folder. The player 102 requests the authentication server 40 indicated by the read address to authenticate the use of the content. This request includes a content identifier and a user identifier. The content identification is included in the content, for example (the content identifier is not encrypted and is included in the content in plain text). The user identifier is set in advance via the player 102, and a setting file including the user identifier is stored. The authentication server 40 confirms whether the user has the right to use the requested content (step S111). The authentication server 40 transmits an authentication response indicating the authentication result to the player 102 that is the transmission source of the authentication request (step S112). Specifically, when it is confirmed that the user has the right, the authentication server 40 sends information necessary for using the content (for example, a decryption key for decrypting the general-purpose DRM) to the player 102. Send to. If it is not confirmed that the user has the right, the authentication server 40 transmits a notification to the player 102 that there is no right to use the content. In step S113, the player 102 decrypts the content using the decryption key transmitted from the authentication server, and uses the decrypted content (for example, reproduces a moving image, a still image, or sound).

  As described above, the renderer 103 is a native program, and in many cases, is installed at the factory before the mobile communication terminal 10 is shipped (one renderer 103 per one mobile communication terminal 10). Since it is specialized in the hardware and software platform of the mobile communication terminal 10, it is not easy to update the renderer 103. In addition, when content is distributed by broadcasting, the same data is transmitted to a plurality of mobile communication terminals 10 at a time, so it is necessary to change the standard (broadcast DRM algorithm and encryption key) once determined. It's not easy. For example, when content for which copyright management is performed using only broadcast DRM is distributed, the entire system including the broadcast server 20 and the renderer 103 must be updated in order to change the copyright management method. It is. On the other hand, in the content distribution system 1, the content is double-encrypted by the broadcast DRM and the general-purpose DRM, and the copyright management by the general-purpose DRM is possible even after the broadcast DRM is decrypted. The general-purpose DRM can be handled by an application program, so that updating is easier than changing the configuration of the renderer 103. Further, in the content distribution system 1, since the content delivery destination is automatically determined according to the items described in the control file, the user's operation can be reduced. As described above, according to the content distribution system 1, the expandability of copyright management of content distributed by broadcasting can be improved.

2. Second Embodiment FIG. 9 is a sequence chart showing an operation according to the second embodiment of the content distribution system 1. The second embodiment is different from the first embodiment in that the player 102 has the check means 14 instead of the renderer 103.

  In step S201, the broadcast server 20 distributes data by broadcasting. In step S202, the resident 101 receives data distributed by broadcasting. In step S203, the resident 101 requests the renderer 103 to decrypt the received data. In step S204, the renderer 103 decrypts the designated data. The renderer 103 writes the decrypted data in the designated folder. In step S205, the renderer 103 transmits a decryption response indicating that the decryption is completed to the resident 101 that is the decryption request source. Upon receiving the decryption response, the resident 101 determines to which other application program the content is to be delivered (step S206). In step S <b> 207, the resident 101 performs a delivery process for delivering the content to the player 102. The above processing is performed in the same manner as steps S101 to S104 and S106 to S108.

  In step S208, the player 102 checks whether the control file has been tampered with. If the control file has been tampered with, the player 102 notifies the user that the control file has been tampered with, and ends the process of FIG. If the control file has not been tampered with, the player 102 continues the processing from step S209. In step S209, the player 102 performs confirmation processing to determine whether the user has the right to use the specified content. When it is confirmed that the user has the right, the player 102 uses the content (step S213). According to the present embodiment, it is possible to detect falsification of the control file in the malicious resident 101 (or the broadcast server 20 and the CP server 30 higher than the resident 101).

3. Other Embodiments The present invention is not limited to the above-described embodiments, and various modifications can be made. Hereinafter, some modifications will be described. Two or more of the following modifications may be used in combination.

  The sharing of functions among the resident 101, the player 102, and the renderer 103 is not limited to that described in the first embodiment and the second embodiment. As long as the resident 101 has the receiving means 11 and the calling means 16, the renderer 103 has the decoding means 12, and the player 102 has the using means 17, any program may have other functions. For example, the renderer 103 may have the determination unit 13. In this case, the decryption response includes information for specifying the content delivery destination program. Further, the function of the resident 101 may be realized by a plurality of application programs. For example, the receiving unit 11 and the calling unit 16 may be realized as functions of different application programs.

The delivery method by the delivery means 15 is not limited to what was demonstrated in embodiment. In the embodiment, the example in which the content decrypted by the renderer 103 is stored in the designated storage area on the storage unit 140 has been described. However, delivery of content may be performed by other methods. For example, content may be delivered using inter-process communication between the renderer 103 and the player 102. Alternatively, content may be transferred using the input / output function of the OS 104. In summary, the delivery method by the delivery means 15 may be any of the following methods, for example.
(1) Direct notification: A method of notifying between applications.
(2) Indirect notification: A method of notifying through the data on the storage device for managing the presence of content to be delivered (this method is described in the embodiment).
(3) Implicit notification: a method in which the output time, location (storage area), content (file name, extension name), or application program to be used is determined in advance.

  The hardware configuration for realizing each function of the content distribution system 1 is not limited to that illustrated in FIGS. An apparatus having any hardware configuration may be used as long as a necessary function can be realized. For example, a single device may have all functions as the broadcast server 20, the CP server 30, and the authentication server 40. Each server may have a circuit (device) corresponding to each functional element in FIG. The same applies to the mobile terminal 10.

  The mobile terminal 10 is not limited to a mobile phone. The mobile terminal 10 may be a laptop computer, a smartphone, a tablet terminal, a car navigation device, a PDA (Personal Digital Assistant), an electronic book, or a portable music player.

The conditions and parameter values used in the description of the embodiment are merely examples, and the present invention is not limited to these.
In the above-described embodiment, the program executed by the CPU 110 or the like is a magnetic recording medium (magnetic tape, magnetic disk (HDD, FD (Flexible Disk)), etc.), optical recording medium (optical disk (CD (Compact Disk)), DVD (Digital). Versatile Disk))), a magneto-optical recording medium, and a computer-readable recording medium such as a semiconductor memory (flash ROM or the like). The program may be downloaded via a network such as the Internet.

DESCRIPTION OF SYMBOLS 1 ... Content delivery system, 10 ... Mobile communication terminal, 11 ... Reception means, 12 ... Decoding means, 13 ... Judgment means, 14 ... Check means, 15 ... Delivery means, 16 ... UI means, 17 ... Use means, 18 ... Confirmation Means, 20 ... broadcast server, 30 ... CP server, 40 ... authentication server, 101 ... resident, 102 ... player, 103 ... renderer, 104 ... OS, 110 ... CPU, 120 ... RAM, 130 ... ROM, 140 ... storage unit, DESCRIPTION OF SYMBOLS 150 ... Communication part, 160 ... Input part, 170 ... Display part, 180 ... Broadcast receiving part, 210 ... CPU, 220 ... RAM, 230 ... ROM, 240 ... Memory | storage part, 250 ... Communication part, 260 ... Input part, 270 ... Display unit, 280 ... Broadcast transmission unit, 310 ... CPU, 320 ... RAM, 330 ... ROM, 340 ... Storage unit, 350 ... Communication unit, 360 ... Input , 370 ... display unit, 410 ... CPU, 420 ... RAM, 430 ... ROM, 440 ... storage unit, 450 ... communication unit, 460 ... input unit, 470 ... display unit

Claims (9)

A group of files distributed by broadcasting and encrypted by the first encryption method used in the broadcast , the control file and an entity file encrypted by a second encryption method different from the first encryption method. Receiving means for receiving a file group including:
Decryption means for decrypting data encrypted by the first encryption method;
Delivery for performing delivery processing for delivering the entity file as encrypted by the second encryption method to another program specified based on the control file included in the file group decrypted by the decryption means It possesses the means,
The other program includes an instruction group for executing a process for decrypting the entity file encrypted by the second encryption method and an instruction group for using the entity file.
A mobile communication terminal characterized by the above. Based on the control file, having a determination means for determining a program to which the entity file is transferred;
2. The mobile communication terminal according to claim 1, wherein the delivery unit performs the delivery process using the program determined as the delivery destination by the judgment unit as the other program. The control file includes the type of the entity file, the identifier of the second encryption method, or the identifier of the other program as cooperation destination information,
The mobile communication terminal according to claim 2, wherein the determination unit determines the delivery destination program based on the cooperation destination information. A storage device storing the first program and the second program;
A processor for executing the first program or the second program;
A communication unit for communicating with other devices,
The first program includes a group of instructions for causing the processor, the storage device, and the communication unit to function as the decoding unit,
The other program is the second program,
The control file includes an address of a specific server on the network,
The second program causes the processor, the storage device, and the communication unit to function as a confirmation unit that accesses the specific server indicated by an address included in the control file and confirms whether or not the entity file can be used. The mobile communication terminal according to any one of claims 1 to 3, further comprising a command group. The storage device further stores a third program,
The third program includes the processor, the storage device, and the communication unit.
The receiving means;
Calling means for calling the decoding means to decode the group of files received by the receiving means;
Including a group of instructions for functioning as the delivery means;
The decryption means performs the decryption when called from the third program, stores the decrypted file group in the storage device, and stores an address at which the file group is stored in the storage device. Informing the third program,
The mobile communication terminal according to claim 4, wherein the delivery process includes a process of notifying the second program of an address notified from the decryption unit. The first program stores the processor and the storage device.
The mobile communication terminal according to claim 5 , further comprising: a command group that functions as check means for checking falsification of the control file and notifying the third program of a check result. The second program stores the processor and the storage device.
The mobile communication terminal according to claim 5 , further comprising: a command group that functions as check means for checking falsification of the control file and notifying the third program of a check result. A group of files distributed by broadcasting and encrypted by the first encryption method used in the broadcast, including a control file and an entity file encrypted by a second encryption method different from the first encryption method Receiving a group of files;
Decrypting the data encrypted by the first encryption method;
Performing a delivery process for delivering the entity file as encrypted by the second encryption method to another program specified based on the control file included in the decrypted file group. And
The other program includes an instruction group for executing a process for decrypting the entity file encrypted by the second encryption method and an instruction group for using the entity file.
An information delivery method characterized by the above. On the computer,
A group of files distributed by broadcasting and encrypted by the first encryption method used in the broadcast , the control file and an entity file encrypted by a second encryption method different from the first encryption method. Receiving a group of files including:
Decrypting the data encrypted by the first encryption method;
Performing a delivery process for delivering the entity file as encrypted by the second encryption method to another program specified based on the control file included in the decrypted file group. A program for
The other program includes an instruction group for executing a process for decrypting the entity file encrypted by the second encryption method and an instruction group for using the entity file.
A program characterized by that .

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