JP2012050028A - Information processing apparatus, information processing system, information processing method, program and recording medium - Google Patents

Abstract

In an apparatus having a digital terrestrial broadcast reception function and a broadcast content recording / playback function, key data for realizing DRM without using a special external storage that the user cannot freely access, and a user in data broadcasting The data generated by the input of can be held securely.
An information processing apparatus stores encrypted content data among broadcast-related data in a storage unit of the own apparatus, and stores a content key used for decrypting the content data in a storage unit of the data distribution apparatus. Of the data related to the first storage control means and the broadcast content, the user data generated based on the user input is stored in the storage means of the own apparatus, and the check data generated based on the user data is stored in the data distribution apparatus. Second storage control means for storing in the storage means, and third storage control means for storing other data among the data relating to the broadcast content in the storage means of the own apparatus.
[Selection] Figure 1

Description

  The present invention relates to an information processing apparatus, an information processing system, an information processing method, a program, and a recording medium. is there.

  In recent years, digitalization of broadcasting such as terrestrial digital broadcasting, one-segment broadcasting, and digital radio broadcasting has been rapidly progressing and becoming popular. In digital broadcasting, in addition to improving basic services such as high image quality and high sound quality, it is possible to utilize advanced services that can only be realized by digitalization, such as data broadcasting, interactive services, and broadcasting services for mobile terminals. Expected.

  With the development of information processing technology and communication technology, many video contents, music contents, etc. are handled as digital data and distributed through various communication networks. Digital data has the property of not deteriorating even if it is copied multiple times or through long-distance communications, so recently digital content has been illegally copied and transmitted over wide-area communication networks such as the Internet. There are no end to cases of unauthorized distribution. In order to counter such illegal acts, a technique called digital rights management (DRM) for restricting the use and distribution of digital contents is used in streaming distribution of contents and the like. This DRM is similarly adopted in terrestrial digital broadcasting.

  By the way, in a digital television receiver having a reception function for terrestrial digital broadcasting, user data used in data broadcasting (for example, game score, playable number, etc., hereinafter referred to as data broadcasting data in the present specification) and broadcasting A nonvolatile memory for holding data such as a wave frequency list (hereinafter referred to as other setting data in the present specification) is required. In addition to the above-described broadcast receiving function, the recording / playback apparatus further includes a recording / playback function. In addition to the above, the received broadcast content data (hereinafter referred to as content data in the present specification) and DRM for content files are used. A non-volatile memory that holds the content key is also required.

  When the above-described broadcast receiving function and recording / playback function are implemented in a personal computer, if a normal system configuration is used, the necessary nonvolatile memory is configured by an external storage that can be freely accessed by the user. For this reason, there is a risk that these non-volatile memories are misused. For example, a pirated version of Blu-ray or DVD is created using the content key, or the data broadcasting data is abused and the broadcasting station is damaged (when the number of playable games with a free gift is made infinite) Etc.). As an example of countermeasures against this problem, an external storage of a unique file system is provided in a personal computer, and information such as content keys and data broadcasting data is held therein so that the user cannot freely access such information. To be done.

Further, for example, in Patent Document 1, when two types of contents having different importance levels are to be distributed together, the less important contents can be used by a PC or the like, and the higher importance contents are highly advanced from an unauthorized attack. A copyrighted work protection system is disclosed. In the copyrighted work protection system, the receiving unit receives a capsule including the first content subjected to the first encryption and the second content subjected to the second encryption that is more difficult to decrypt. Store in the capsule storage. The first content processing unit realized by the PC decrypts the first content in the capsule by the first decoding method, and the second content processing unit realized by the PC card makes the second content in the capsule more complicated. Decoding is performed by the second decoding method.

JP 2000-348003 A

  The copyrighted work protection system disclosed in Patent Document 1 applies an encryption algorithm having different decryption difficulties depending on the importance of content, and can be said to prepare a content key corresponding to content. That is, when the content key used for encryption is held in an external storage that can be freely accessed by the user, the problem of the security hole cannot be solved.

  In addition, an example of the countermeasures as described above requires that an external storage that is not directly related to the reception function of the digital terrestrial broadcasting must be always mounted. Even if the other hardware requirements are satisfied, there remains a problem that it becomes impossible to implement the reception function of digital terrestrial broadcasting.

  Therefore, the present invention provides key data and data for realizing DRM in an apparatus having a digital terrestrial broadcast reception function and a broadcast content recording / playback function without using a special external storage that a user cannot freely access. It is an object of the present invention to be able to securely hold data generated by user input in broadcasting.

  An information processing apparatus according to an aspect of the present invention stores encrypted content data representing broadcast content and stored in a storage unit of the own device among data related to broadcast content received from a data distribution device having a digital broadcast reception function. A first storage control unit that causes the data distribution device to store a content key used for decrypting the content data in the storage unit of the device, and a user generated based on a user input for the broadcast content among the data related to the broadcast content A second storage control unit that stores data in the storage unit of the own device, and causes the data distribution device to store check data generated based on user data in the storage unit of the device; Other data other than data, content key, user data, check data And a third storage control means for storing in the storage means of its own device data, the.

  In the information processing apparatus, the first storage control unit encrypts the content key used for decrypting the encrypted content data representing the broadcast content using the identification information unique to the terminal of the own device, and the encrypted content The key may be stored in the storage unit of the data distribution apparatus.

  In the information processing apparatus, the second storage control unit obtains check data by applying a predetermined function to user data generated based on a user input to the broadcast content, and distributes the obtained check data to the data The device may be stored in the storage means of the device.

In the above information processing apparatus, the second storage control means encrypts user data generated based on a user input to the broadcast content using identification information unique to the terminal of the own apparatus, and stores the encrypted user data. You may memorize | store in the memory | storage means of an own apparatus.

  In the information processing apparatus described above, the third storage control means uses the identification information unique to the terminal of the own apparatus to represent the broadcast content, the encrypted content data, the content key used for decrypting the content data, and the user for the broadcast content User data generated based on the input of the user, other data other than the check data generated based on the user data may be encrypted, and the encrypted other data may be stored in the storage unit of the own device. .

  In the information processing apparatus, the second storage control unit reads user data from the storage unit of the own device, applies a predetermined function to the read user data, obtains check data, and obtains the check data and data The check data acquired from the distribution device may be compared, and if the two data do not match, the user data reading process may be terminated with an error.

  An information processing system according to one aspect of the present invention includes an information processing apparatus as a client and a data distribution apparatus as a server having a digital broadcast reception function and distributing data related to broadcast content. In the system, the information processing apparatus stores the encrypted content data representing the broadcast content among the data related to the broadcast content received from the data distribution apparatus in the storage unit of the own apparatus, and used for decrypting the content data First storage control means for storing a key in the storage means of the data distribution device, and user data generated based on a user input to the broadcast content among data related to the broadcast content is stored in the storage means of the own device And check data generated based on user data Second storage control means for storing in the storage means of the communication apparatus, and other data other than content data, content key, user data, and check data among the data relating to the broadcast content are stored in the storage means of the own apparatus And third storage control means.

  An information processing method according to an aspect of the present invention is directed to an information processing apparatus that receives encrypted content data representing broadcast content from data related to broadcast content received from a data distribution device having a digital broadcast reception function. A first storage step of causing the data distribution device to store the content key used for decrypting the content data in the storage unit, and the information processing device receives the broadcast content from among the data related to the broadcast content A second storage step of storing the user data generated based on the user's input to the storage device of the own device, and causing the data distribution device to store the check data generated based on the user data in the storage device of the device Among the data related to the broadcast content received by the information processing device. A capacitor, the content key, and a third storing step of storing user data, other data except the check data in the storage means of its own device.

  A program according to an aspect of the present invention stores, in a computer of an information processing device, content data that represents broadcast content and is encrypted among data related to broadcast content received from a data distribution device having a digital broadcast reception function. A first storage process in which the data distribution device stores the content key used for decrypting the content data in the storage unit of the data distribution device, and the user's input for the broadcast content among the received broadcast content data A second storage process for storing the user data generated based on the user data in the storage unit of the own device, and causing the data distribution device to store the check data generated based on the user data in the storage unit of the device, and the received broadcast Of the data related to content, content data, content key, user data Data, a third storage process of storing the other data except the check data in the storage means of the apparatus, is executed.

A recording medium according to one aspect of the present invention is a computer-readable recording medium on which the above program is recorded.

  According to the present invention, in an apparatus having a digital terrestrial broadcast reception function and a broadcast content recording / playback function, key data and data for realizing DRM without using a special external storage that a user cannot freely access Data generated by user input in broadcasting can be securely held.

It is a figure for demonstrating the outline | summary of the data holding implement | achieved by the process of this invention. 1 is a configuration diagram of an information processing system according to an embodiment of the present invention. It is a hardware block diagram of PC and a video delivery apparatus which concerns on embodiment of this invention. It is a functional block diagram of PC concerning embodiment of this invention. It is a figure for demonstrating the data control process which concerns on embodiment of this invention. 4 is a flowchart of data control processing (data broadcasting data writing processing) according to an embodiment of the present invention. It is a flowchart of the data control process (data broadcasting data reading process) according to the embodiment of the present invention. It is a flowchart of the data control process (The reading process of the data for data broadcasting at the time of a digital television function starting) which concerns on embodiment of this invention.

  As a primary solution to the above problem, a storage area that a user cannot access in a model that realizes a digital television function of an information processing apparatus by receiving broadcast content from a data distribution apparatus having a digital broadcast reception function It is conceivable to store data such as a content key to be prevented from being misused in a (storage device included in the data distribution device). However, some of these data frequently undergo read / write access by using the digital television function, the communication load between the data distribution device and the information processing device, the storage device of the data distribution device If the flash memory is a flash memory, there is a risk of reducing the useful life of the flash memory due to the compression of its capacity and excessive writing. For this reason, in the present invention, each data is distributed to the data distribution device and the information processing device according to the security level of the data in consideration of the access frequency of reading / writing of the data related to the broadcast content distributed from the data distribution device. And hold it.

  In an embodiment in which the present invention is applied to a video distribution apparatus having a digital broadcast reception function and a PC that receives broadcast content from the video distribution apparatus, each data is held as shown in FIG. The data with the highest security level (content key) is encrypted with the GUID (unique ID) of the PC, and is stored on the video distribution device side (for example, a flash memory in which firmware is stored) to be completely hidden. In addition, for data (data for data broadcasting) having the next highest level and the frequency of reading / writing, the actual data is encrypted with the GUI of the PC and held on the PC side (for example, HDD), and the checksum of the actual data is stored. (4 bytes) is held on the video distribution side. As a result, even if a malicious user performs alterations such as writing data broadcasting data back to a file at the previous time, the system does not accept the file because the checksum is different. The lowest level data (other setting data) is encrypted with the PC GUID and held on the PC side. Note that the other setting data is set to the lowest level because no user merit occurs even if it is tampered.

Incidentally, the process of encrypting each data with the GUI of the PC is to make the data usable only by the device (PC). This is a measure for complying with the broadcasting guidelines on PCs that a single service cannot be received simultaneously by a plurality of machines by diverting content files and subsystems (video distribution apparatus in the above example) to other machines. It is.

  The embodiment of the present invention will be described in more detail with reference to FIGS.

  FIG. 2 is a configuration diagram of the information processing system according to the embodiment of the present invention. The information processing system of this embodiment includes a video distribution device 20 that has a digital broadcast receiving function and distributes data related to broadcast content, and a PC 10 that receives data related to broadcast content from the video distribution device 20. . The video distribution device 20 receives the broadcast wave radiated from the broadcast station 40 via the TV tower 30 and acquires data related to the broadcast content such as content data, content key, data broadcast data, and other setting data.

  The PC 10 and the video distribution apparatus 20 are connected wirelessly or by wire, and a network such as WLAN or LAN is formed by these apparatuses. In the network, the video distribution device 20 that distributes data related to broadcast content to the PC 10 is positioned as a server, and the PC 10 that receives data distribution from the video distribution device 20 is positioned as a client. The PC 10 realizes a digital television function by receiving broadcast content received from the video distribution device 20.

  FIG. 3 is a hardware configuration diagram of the PC and the video distribution apparatus according to the embodiment of the present invention. As shown in FIG. 3A, the PC 10 of this embodiment is a PC having a general hardware configuration, and includes a CPU 11, a memory 12, an HDD 13, an input device 14, an output device 15, and a communication I / F 16. .

  The CPU 11 controls the overall operation of the PC 10 according to the OS stored in the memory 12 and the program specific to the present embodiment, and performs data control processing (PC 10. Distributed data holding processing) between the video distribution apparatuses 20 is performed. The memory 12 has a storage area (ROM) for storing the OS and programs unique to the present embodiment, and a work storage area (RAM) used for various processes of the CPU 11. The HDD 13 is an external storage device that holds various data related to broadcast content. The input device 14 is a device that receives an input operation by a user, and is a mouse, a keyboard, or the like. The output device 15 is a device that performs screen output and audio output of various data, and is a display, a speaker, or the like. The communication I / F 16 is an interface for communicating with the video distribution device 20.

  As shown in FIG. 3B, the video distribution device 20 of the present embodiment is a device having a digital broadcast receiving function, and includes a CPU 21, a memory 22, a broadcast receiving device 23, and a communication I / F 24.

  The CPU 21 performs overall operation control of the video distribution device 20 according to the firmware stored in the memory 22. The memory 22 is configured by a flash memory that stores a part of data relating to firmware and broadcast content. The broadcast receiving device 23 has a function of receiving broadcast waves from the broadcast station 40, and includes an antenna, a tuner, and the like. The communication I / F 24 is an interface for communicating with the PC 10.

FIG. 4 is a functional configuration diagram of the PC according to the present embodiment. In the PC 10 of the present embodiment, the CPU 11 reads a program specific to the present embodiment stored in the memory 12 and performs data control processing (PC 10 / video distribution device) based on the security level of data related to broadcast content and the assumed access situation. The control unit 100 is configured as a functional unit for performing distributed data holding processing between 20). The control unit 100 logically includes a storage control unit 110 and a communication control unit 120. The storage control unit 110 includes a first storage control unit 111, a second storage control unit 112, and a third storage control unit 113. Each means may be realized by software as described above, or may be realized by hardware using a circuit or the like.

  The storage control unit 110 stores the data related to the broadcast content received from the video distribution device 20 in the data storage destination (the HDD 13 of the PC 10 or the memory 22 of the video distribution device 20) according to the data type. The communication control unit 120 performs communication control with the video distribution device 20 connected to the network. The first storage control unit 111 stores the content data encrypted with the content key in the HDD 13 of the PC 10, and stores the content key encrypted with the GUID of the PC 10 in the memory 22 in the video distribution device 20. The second storage control unit 112 stores the data broadcasting data in the HDD 13 of the PC 10, and stores the check data (checksum) generated from the data broadcasting data encrypted with the GUID of the PC 10 in the video distribution device 20. 22 is stored. The checksum can be obtained by applying a predetermined function to the encrypted data broadcasting data. The third storage control unit 113 stores other setting data encrypted with the GUID of the PC 10 in the HDD 13 of the PC 10.

  FIG. 5 is a diagram for explaining data control processing according to the embodiment of the present invention. The digital TV control software 1100 is an application for executing a digital television function. The memory control module 1200 corresponds to the storage control unit 110 in FIG. 4 and the LAN / WLAN control module 1300 corresponds to the communication control unit 120. Further, as will be described later, the memory control module 1200 performs processing corresponding to the operation processing of the first storage control unit 111, the second storage control unit 112, and the third storage control unit 113 of FIG. 4 in each control block.

  The digital TV control software 1100 requests the memory control module 1200 to read / write necessary data, and causes the memory control module 1200 to perform data read / write processing. Data is first distributed to the following three control blocks according to each data type by the data dispatch control 1302. Each control block will be described below.

<Content key control 1303>
In the memory control module 1200, the control block performs processing corresponding to the operation processing of the first storage control unit 111 of FIG. In the content key control 1303, when there is a content key write request from the digital TV control software 1100, the content key encrypted with the GUID of the PC 10 is uploaded to the video distribution device 20. The video distribution apparatus 20 stores the encrypted content key 1010 in the memory 22 via the memory control module 2300. Further, every time the PC 10 and the video distribution device 20 are connected, the encrypted content key 1010 stored in the memory 22 of the video distribution device 20 is downloaded to the PC 10.

  The content key control 1303 writes data (encrypted content key 1003) having the same content as the encrypted content key stored in the video distribution device 20 in the volatile memory (cache memory) of the PC 10 every time upload and download are completed. In preparation for a content key read request from the TV control software 1100. Therefore, when there is a content key read request from the digital TV control software 1100, the encrypted content key 1003 stored in the cache memory is returned.

<Data control for data broadcasting 1304>
This is a control block that performs processing corresponding to the operation processing of the second storage control means 112 in FIG. 4 in the memory control module 1200. In the data broadcast data control 1304, when the digital TV control software 1100 is activated, the data broadcast data 1004 encrypted with the GUID of the PC 10 is read from the HDD 13. Each time the PC 10 and the video distribution device 20 are connected, the checksum 1011 stored in the memory 22 of the video distribution device 20 is downloaded to the PC 10.

  When there is a data broadcast data write request from the digital TV control software 1100, the data broadcast data is encrypted with the encryption key generated from the GUID of the PC 10, and the encrypted data broadcast data 1004 is written to the HDD 13. A checksum 1011 obtained from the encrypted data broadcasting data is uploaded to the video distribution device 20. The video distribution apparatus 20 stores the checksum 1011 in the memory 22 via the memory control module 2300.

  The data broadcast data control 1304 is the same as the encrypted data broadcast data 1004 stored in the HDD 13 of the PC 10 when the digital TV control software 1100 is started and when data broadcast data is read / written from the digital TV control software 1100. The content data (encrypted data broadcast data 1007) is written into the volatile memory (cache memory). Therefore, when there is a request to read data broadcasting data, data obtained by decrypting the encrypted data broadcasting data 1007 stored in the cache memory with the encryption key generated from the GUID of the PC 10 is returned. Data encryption / decryption is performed by the encryption control 1307 via the data management control 1306.

<Other broadcasting data control 1305>
In the memory control module 1200, the control block performs processing corresponding to the operation processing of the third storage control means 113 in FIG. It has almost the same function as the data control for data broadcasting 1304 except that the process related to the checksum is not performed. However, the following items are different from the data control 1304 for data broadcasting. Since the other setting data has an initial value, when reading fails at startup such as when the data does not exist or is damaged, an initial value file (other setting data (initial value) 1006) is saved. Reading from the HDD 13 and writing to the cache memory as data broadcasting data 1008. Note that the initial value file is encrypted with a fixed key (an encryption key hard-coded in the memory control module 1200).

  FIG. 6 is a flowchart of data control processing (data broadcasting data writing processing) according to the embodiment of the present invention. First, in the data broadcast data control 1304, the data broadcast data is encrypted with the GUID of the PC 10 via the data management control 1306 and the encryption control 1307 (step S11). Next, a checksum is obtained from the encrypted data broadcasting data (step S12). Next, the encrypted data broadcasting data is written in the HDD 13 (step S13).

  Subsequently, in the data control for data broadcasting 1304, the checksum obtained in step S12 is uploaded to the video distribution device 20, and the video distribution device 20 is written into the memory 22 (flash memory) (step S14). Then, the data broadcasting data encrypted in step S11 is written in the volatile memory (cache memory) (step S15).

  FIG. 7 is a flowchart of data control processing (data broadcasting data reading processing) according to the embodiment of the present invention. First, in the data broadcast data control 1304, the data broadcast data encrypted with the GUID of the PC 10 is read from the volatile memory (cache memory) (step S21). Next, the read encrypted data broadcast data is decrypted with the GUID of the PC 10 (step S22).

  FIG. 8 is a flowchart of data control processing (data broadcasting data reading processing when the digital TV control software is activated) according to the embodiment of the present invention. After starting the digital TV control software 1100, the data broadcast data control 1304 reads data broadcast data encrypted with the GUID of the PC 10 from the HDD 13 (step S31). Next, after the PC 10 and the video distribution device 20 are connected, the checksum stored in the memory 22 (flash memory) of the video distribution device 20 is downloaded (step S32). Subsequently, a checksum is obtained from the encrypted data broadcast data read in step S31 (step S33).

  Next, the checksum downloaded in step S32 is compared with the checksum obtained in step S33. If they match (step S34 / YES), it is determined that the read encrypted data broadcast data is valid. Is written into the volatile memory (cache memory) (step S35). On the other hand, if they do not match (step S34 / NO), the read data broadcast data reading process is terminated with an error (step S36), assuming that the read encrypted data broadcast data is not valid.

  In the flows shown in FIGS. 6 to 8, it is assumed that there is no failure in the access process to the data for data broadcasting. As shown in FIGS. 6 and 8, in the data broadcast data control 1304, the checksum of the data broadcast data written in the volatile memory (cache memory) is always uploaded / downloaded to the video distribution device 20. Therefore, when a malicious user attempts to write to the volatile memory (cache memory) with the data broadcast data control 1304 after performing a falsification action such as writing back the data broadcast data stored in the HDD 13 of the PC 10, By comparing checksums, it is possible to detect inconsistencies in data for data broadcasting, and reject reading of data after falsification.

  The above-described embodiment is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiment alone, and various modifications are made without departing from the gist of the present invention. Implementation is possible.

  That is, the program executed by the PC 10 in this embodiment has a module configuration including the above-described units (first storage control unit 111, second storage control unit 112, and third storage control unit 113). (These means correspond to the memory control module 1200), and actual means are realized using actual hardware. That is, when the computer (CPU) reads a program from a predetermined recording medium and executes it, the above-mentioned means are loaded onto the main storage device and generated.

  The program executed on the PC 1 in this embodiment may be configured to be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. Further, the program may be provided or distributed via a network such as the Internet.

  The program is a file in an installable or executable format, such as a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, DVD, nonvolatile memory card, or the like. It may be configured to be provided by being recorded on a computer-readable recording medium. Further, the program may be provided by being incorporated in advance in a ROM or the like.

  In this case, the program code itself read from the recording medium or loaded and executed through the communication line realizes the functions of the above-described embodiments. And the recording medium which recorded the program code comprises this invention.

10 PC
11,21 CPU
12, 22 Memory 13 HDD
14 Input device 15 Output device 16, 23 Communication I / F
20 Video Distribution Device 30 Television Tower 40 Broadcast Station 100 Control Unit 110 Storage Control Unit 111 First Storage Control Unit 112 Second Storage Control Unit 113 Third Storage Control Unit 120 Communication Control Unit 1100 Digital TV Control Software 1200, 2200 Memory Control Module 1201 , 1208 IF
1202 Data dispatch control 1203 Content key control 1204 Data broadcast data control 1205 Other broadcast data control 1206 Data management control 1207 Encryption control 1300, 2300 LAN / WLAN control module

Claims (10)

Among data related to broadcast content received from a data distribution device having a digital broadcast reception function, content data representing broadcast content and encrypted are stored in the storage unit of the device, and a content key used for decrypting the content data is stored. First storage control means for causing the data distribution apparatus to store in the storage means of the apparatus;
Of the data related to the broadcast content, user data generated based on user input to the broadcast content is stored in the storage unit of the own device, and check data generated based on the user data is stored in the data distribution device. Second storage control means for storing in the storage means of the apparatus;
A third storage control unit that stores other data other than the content data, the content key, the user data, and the check data among the data related to the broadcast content in a storage unit of the own device;
An information processing apparatus comprising:   The first storage control means encrypts the content key used for decrypting the encrypted content data representing the broadcast content using the identification information unique to the terminal of the own device, and the encrypted content key is transmitted to the data distribution unit. The information processing apparatus according to claim 1, wherein the information is stored in a storage unit of the apparatus.   The second storage control means obtains check data by applying a predetermined function to user data generated based on a user input to broadcast content, and sends the obtained check data to the data distribution apparatus. The information processing apparatus according to claim 1, wherein the information processing apparatus is stored in the storage unit.   The second storage control means encrypts user data generated based on a user input to broadcast content using identification information specific to the terminal of the own apparatus, and stores the encrypted user data in the own apparatus. The information processing apparatus according to claim 1, wherein the information processing apparatus is stored in the information processing apparatus.   The third storage control means uses the identification information unique to the terminal of the own device, based on content data representing broadcast content and encrypted, a content key used for decrypting the content data, and a user input to the broadcast content. 2. The generated user data and other data other than the check data generated based on the user data are encrypted, and the encrypted other data is stored in a storage unit of the apparatus. 5. The information processing apparatus according to any one of 4.   The second storage control means reads the user data from the storage means of its own device, obtains check data by applying a predetermined function to the read user data, the obtained check data and the data distribution device 6. The information processing according to claim 1, wherein the data for checking is compared with the check data, and if the two data do not match, the user data reading process is terminated with an error. apparatus. An information processing system including an information processing device as a client and a data distribution device as a server having a digital broadcast receiving function and distributing data related to broadcast content,
The information processing apparatus includes:
Of the data relating to the broadcast content received from the data distribution device, the encrypted content data representing the broadcast content is stored in the storage means of the own device, and the content key used for decrypting the content data is stored in the data distribution device. First storage control means for storing in the storage means of the apparatus;
Of the data related to the broadcast content, user data generated based on user input to the broadcast content is stored in the storage unit of the own device, and check data generated based on the user data is stored in the data distribution device. Second storage control means for storing in the storage means of the apparatus;
A third storage control unit that stores other data other than the content data, the content key, the user data, and the check data among the data related to the broadcast content in a storage unit of the own device;
An information processing system comprising: The information processing apparatus stores the encrypted content data representing the broadcast content in the storage unit of the own apparatus among the data related to the broadcast content received from the data distribution apparatus having a digital broadcast reception function, and decrypts the content data. A first storage step of causing the data distribution device to store the content key used in the storage unit of the device;
The information processing apparatus stores user data generated based on a user input on the broadcast content among the data related to the received broadcast content in a storage unit of the own apparatus, and a check generated based on the user data A second storage step of causing the data distribution device to store data for storage in the storage means of the device;
A third storage step in which the information processing device stores other data other than the content data, the content key, the user data, and the check data among the data related to the received broadcast content in a storage unit of the own device; ,
An information processing method characterized by comprising: In the computer of the information processing device,
Among data related to broadcast content received from a data distribution device having a digital broadcast reception function, content data representing broadcast content and encrypted are stored in the storage unit of the device, and a content key used for decrypting the content data is stored. A first storage process for storing the data distribution device in a storage means of the device;
Of the received data related to the broadcast content, user data generated based on the user's input to the broadcast content is stored in a storage unit of the own device, and the check data generated based on the user data is stored in the data distribution A second storage process for causing the apparatus to store the storage means of the apparatus;
A third storage process for storing other data other than the content data, the content key, the user data, and the check data among the received broadcast content data in a storage unit of the own device;
A program characterized by having executed.   A recording medium that records the program according to claim 9 and is readable by a computer.

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