JP4950868B2 - Information processing apparatus and information processing method - Google Patents

Description

  The present invention relates to an information processing apparatus including a plurality of digital tuners that receive broadcast waves of digital broadcasting and an information processing method thereof.

Conventionally, a CATV system described in Patent Document 1 below is known as a technology in such a field. This CATV system includes a plurality of tuners that receive encrypted broadcast signals. An IC card for outputting a release key for decoding a broadcast signal is inserted into one tuner among the plurality of tuners. Each of the other tuners to which the IC card is not inserted obtains the IC card release key from one tuner in which the IC card is inserted, and decrypts the received broadcast signal so that it can be viewed. That is, a plurality of tuners of this system share one IC card and acquire a release key from the IC card.
JP 2000-236527 A

  By the way, in this type of digital broadcast receiving system, when a plurality of tuners and a plurality of copyright protection devices connected to each tuner are provided, the encryption key information included in the broadcast wave is transmitted to the plurality of copyright protection devices. There are cases where a specification that each holds is required. In this case, the encryption key information held by each copyright protection device needs to be synchronized. However, for example, when a part of a plurality of copyright protection devices is turned off for power saving or some trouble occurs, the copyright protection device must be obtained from the broadcast wave. Key information cannot be acquired, and encryption key information held by each copyright protection device cannot be sufficiently synchronized.

  Accordingly, an object of the present invention is to provide an information processing apparatus and an information processing method capable of synchronizing encryption key information held by a plurality of copyright protection apparatuses.

  An information processing apparatus according to the present invention includes a plurality of digital tuners that receive broadcast waves of a digital broadcast, and a plurality of copyright protections that are connected to the respective digital tuners and each hold encryption key information used for decrypting the digital broadcast. And copyright protection device control means for controlling processing relating to encryption key information of each copyright protection device. Each copyright protection device controls the copyright protection device for broadcast wave information obtained through a digital tuner. The copyright protection device control means transmits the encryption key information included in the broadcast wave information received from any of the copyright protection devices to all the copyright protection devices at the same time. .

  The information processing method of the present invention includes a plurality of digital tuners that receive broadcast waves of a digital broadcast, and a plurality of copyright protections that are connected to the respective digital tuners and each hold encryption key information used for decrypting the digital broadcast. In an information processing method in an information processing device comprising a device and a copyright protection device control means for controlling processing related to encryption key information of each copyright protection device, each copyright protection device is obtained through a digital tuner. Transmitting the broadcast wave information to the copyright protection device control means, and the copyright protection device control means converts the encryption key information included in the broadcast wave information received from any of the copyright protection devices to all the copyrights. And simultaneously transmitting to the protection device.

  According to the information processing apparatus and the information processing method of the present invention, it is possible to synchronize encryption key information held by a plurality of copyright protection apparatuses.

  Hereinafter, preferred embodiments of an information processing apparatus and an information processing method according to the present invention will be described in detail with reference to the drawings. The information processing apparatus of the present invention is realized, for example, as a notebook personal computer 1 shown in FIG. The computer 1 includes a plurality of digital tuners that receive digital television broadcasts and a plurality of copyright protection devices that are connected to the respective tuners. Here, a case where the computer 1 includes three digital tuners C1, C2, and C3 and three copyright protection devices R1, R2, and R3 will be described below as an example.

(First embodiment)
As shown in FIG. 1, the computer 1 includes an MPU 101 that controls the entire system, a RAM 102 that is used when the MPU 101 executes a program such as a host application, and a power source 103 that supplies power. The computer 1 also includes a display device 104 that displays necessary information such as control results, an input / output interface 105 that exchanges information with the outside, a storage device 106 that stores programs and data such as host applications, and a system time setting. And an oscillator 107 for synchronization. The computer 1 further includes a general-purpose bus 108 that transmits and receives commands and data in the system, and an antenna 109 that receives broadcast waves of digital broadcasting.

  As described above, the computer 1 includes three tuners C1, C2, and C3 that receive and demodulate broadcast waves. Also, copyright protection devices R1, R2, and R3 are connected to the tuners C1, C2, and C3, respectively. The copyright protection devices R1 to R3 perform copyright protection processing such as decryption / encryption of the acquired broadcast content. For example, the copyright protection devices R1 to R3 perform decryption processing of the encrypted digital broadcast acquired from the tuners C1 to C3. Further, from the viewpoint of copyright protection, data passing through the general-purpose bus 108 is subjected to local encryption processing by the copyright protection devices R1 to R3.

  Further, the copyright protection devices R1 to R3 are connected to each other through a dedicated internal bus 117, and data can be transmitted / received to / from each other via the internal bus 117. Since the internal bus 117 is a dedicated bus provided between the copyright protection devices R1 to R3, data transmission / reception between the copyright protection devices R1 to R3 via the internal bus 117 is performed in plain text. Further, the computer 1 includes an arbiter 116 that controls communication between the copyright protection devices R1 to R3 via the internal bus 117. The arbiter 116 has a function of arbitrating use requests between the copyright protection devices R1 to R3, and performs exclusive control such as granting use permission to only one of the copyright protection devices R1 to R3 when the use request occurs.

  As shown in FIG. 2, the copyright protection device R1 exchanges information with the MPU 202 that controls the entire copyright protection device R1, the RAM 203 that is used when the MPU 202 executes the copyright protection device control program, and the outside. An input / output interface 205 is provided, a FLASH 204 for storing programs and data, and a register 201 used for state holding. In the FLASH 204, information such as a key information management table 300 (FIG. 3) described later is managed. Of the registers 201, the key information sharing register 201a is readable / writable from the copyright protection device R1, and also from other copyright protection devices R2 and R3 via the input / output interface 205 and the internal bus 117. Writable. Since the copyright protection devices R2 and R3 have the same configuration as the copyright protection device R1, description thereof is omitted.

  A key information management table (key information management information) 300 illustrated in FIG. 3 is a table indicating the update status of encryption key information held by the copyright protection devices R1 to R3, and is stored in the RAM 102. Here, the encryption key information is information necessary for generating an encryption key used for decrypting a digital broadcast, and is obtained from a broadcast wave of the digital broadcast. For example, EMM (Entitlement Management Message) data corresponds to this encryption key information. The copyright protection device control unit 120 (FIG. 5), which will be described later, uses this key information management table 300 to manage the update status of encryption key information held by the copyright protection devices R1 to R3.

  The management number item 301 of the key information management table 300 is an identification number of encryption key information, and is a different number. The Transport_stream_id item 302 is an ID identification added to the encryption key information. The update number item 303 is a number indicating the latest encryption key information received from the broadcast wave, and is used to determine whether the encryption key information included in the broadcast wave is updated. The copyright protection device item 304 is identification information indicating to which of the copyright protection devices R1 to R3 the encryption key information is set (held). For example, in the second row of the key information management table 300 of FIG. 3, the update number = “0x0001” is the latest in the encryption key information with the management number = “2” and transport_stream_id = “2”. The encryption key information is set in the copyright protection device R1 with identification = “1” and the copyright protection device R2 with identification = “2”, and is not stored in the copyright protection device R3 with identification = “3”. It is shown that this is a setting.

  Note that the copyright protection device control unit 120 investigates each connected copyright protection device when the computer 1 is started up, and assigns a different copyright protection device identification to each copyright protection device. Here, identifications “1”, “2”, and “3” are assigned to the three copyright protection devices R1, R2, and R3, respectively. The encryption key information item 305 of the key information management table 300 is actual data of the encryption key information.

  On the other hand, a key information table 400 illustrated in FIG. 4 is stored in the FLASH 204 of each copyright protection apparatus R1. The management number item 401 of the key information table 400 is an identification number of encryption key information, and is a different number. The Transport_stream_id item 402 is an ID identification added to the encryption key information. The update number item 403 is a number indicating the update status of the encryption key information. For example, in the second line of the key information table 400 of FIG. 4, the encryption key information with management number = “2” is updated and set (retained) in the copyright protection device R1 until the update number = “0x0001”. ) Is shown. The encryption key item 404 is actual data of the encryption key information.

  As described above, since the copyright protection devices R1 to R3 have the same configuration, the same key information table 400 is also stored in the FLASH 204 of the copyright protection devices R2 and R3. Each of the copyright protection devices R1 to R3 stores encryption key information by storing such a key information table 400 in the FLASH 204.

  Subsequently, as shown in FIG. 5, the computer 1 uses the tables 300 and 400 to protect the copyright for managing the update status of the encryption key information set in each of the copyright protection devices R1 to R3. A device control unit 120 is provided. The copyright protection device control unit 120 transmits and receives data to and from the copyright protection devices R1 to R3 connected via the general-purpose bus 108. Here, the copyright protection device control unit 120 reads an input / output I / F 105 and a display under the control of the MPU 101 by reading a predetermined host application on hardware such as the MPU 101 and the RAM 102 shown in FIG. It is a component realized by software by operating the device 104 and the storage device 106 and reading and writing data in the RAM 102 and the storage device 106.

  Hereinafter, with respect to the processing relating to the encryption key information set (held) in each copyright protection device R1 to R3 in the computer 1, the processing by the copyright protection device control unit 120 and the processing by the copyright protection devices R1 to R3 This will be explained separately. As described above, since the copyright protection devices R1 to R3 all have the same configuration and perform the same processing, the processing performed by the copyright protection device control unit 120 for the copyright protection device R1 is described below. , And the processing of the copyright protection device R1 will be mainly described, and the description related to the copyright protection devices R2, R3 may be omitted.

  First, the processing of the copyright protection device control unit 120 will be described with reference to the flowchart of FIG. As shown in the figure, when the computer 1 is started up, the copyright protection device control unit 120 performs an initialization process (S601). Here, the copyright protection device control unit 120 confirms the copyright protection devices R1 to R3 connected to the general-purpose bus 108, and confirms the copyright protection device identification assigned to each of the copyright protection devices R1 to R3. . As described above, here, the identifications “1”, “2”, and “3” are assigned to the copyright protection devices R1, R2, and R3, respectively. Thereafter, the copyright protection identification is managed in association with the copyright protection device item 304 of the key information management table 300 (FIG. 3).

  Next, when a command is received from the user (S602), the copyright protection device control unit 120 performs command processing (S603). Thereafter, when the tuners C1 to C3 receive broadcast waves, the broadcast wave information included in the respective broadcast waves is input to the copyright protection devices R1 to R3, and the copyright protection devices R1 to R3 are connected to the general-purpose bus 108, respectively. Then, the broadcast wave information is transmitted to the copyright protection device control unit 120. When the copyright protection device control unit 120 receives and analyzes the broadcast wave information and receives encryption key information such as EMM (Entitlement Management Message) data (S604), the tranport_stream_id of the received encryption key information is Then, it is confirmed whether or not it matches the transport_stream_id item 302 of the key information management table 300 (FIG. 3). Here, when the two match, the copyright protection apparatus control unit 120 further checks whether or not the update number of the received encryption key information matches the update number item 303 of the table 300, and matches. Discards the received encryption key information. On the other hand, when the update number of the received encryption key information does not match the update number item 303 of the table 300, the update number item 303 and the encryption key information item 305 of the table 300 are updated.

  When the transport_stream_id of the received encryption key information does not match the transport_stream_id item 302 of the key information management table 300, the copyright protection device control unit 120 adds a management number 301 to the table 300 and associates it with the management number. Thus, the data of the taransport_stream_id item 302, the update number item 303, and the encryption key information item 305 of the received encryption key information is added. Then, the copyright protection device control unit 120 sends the transport_stream_id, the update number, and the encryption key information of the received encryption key information to the copyright protection device R1, and sets them in the copyright protection device R1 ( S605). When the setting process is successful, the copyright protection device control unit 120 edits the key information management table 300 (FIG. 3) and sets “1” in the copyright protection device item 304 corresponding to the transport_stream_id item 302. Add (S606).

  At the same time, the copyright protection device control unit 120 sends and sets the same transport_stream_id, update number, and encryption key information to the copyright protection device R2 (S605). If the setting processing is successful, the key information management is performed. The table 300 is edited and “2” is added to the copyright protection device item 304 corresponding to the transport_stream_id item 302 (S606). At the same time, the copyright protection device control unit 120 sends and sets the same transport_stream_id, update number, and encryption key information to the copyright protection device R3 (S605), and the key information when the setting processing is successful. “3” is added to the copyright protection device item 304 corresponding to the transport_stream_id item 302 of the management table 300 (S606). That is, the above processes S605 to S606 (hereinafter also referred to as “encryption key information distribution setting process”) are performed simultaneously for all the copyright protection devices R1 to R3 confirmed in the initialization process S601.

  Thereafter, the copyright protection device control unit 120 confirms whether or not the process is to be terminated (S607), and then performs a termination process (S608). The end process S608 will be further described with reference to FIGS.

  In this end process S608, as shown in FIG. 7 and FIG. 8, the copyright protection device control unit 120 refers to the copyright protection device items 304 in order from the lowest management number 301 in the key information management table 300, to It is confirmed that all of the copyright protection device identifications “1”, “2”, “3” confirmed in the conversion processing S601 are described (S702). Here, when the management number 301 in which any of the copyright protection device identifications “1”, “2”, and “3” is missing exists in the copyright protection device item 304, the copyright protection device control unit 120 The transport_stream_id, the update number, and the encryption key information are sent to the unset copyright protection device corresponding to the identified ID and set (S703). If the processing is successful, the management number 301 of the key information management table 300 is supported. The copyright protection device identification is added to the copyright protection device item 304.

  For example, in the case of the table 300 illustrated in FIG. 8, “2” and “3” are missing in the copyright protection device identification corresponding to the encryption key information with transport_stream_id = “2” and update number = “0x02”. Therefore, the copyright protection device control unit 120 sends and sets the transport_stream_id, the update number, and the encryption key information to the copyright protection devices R2 and R3. The processes S702 to S703 as described above are repeated for all the management numbers 301 described in the key information management table 300 (S701).

  Next, processing of the copyright protection devices R1 to R3 for corresponding to the processing of the above-described copyright protection device control unit 120 will be described.

  As shown in FIG. 9, the copyright protection device R1 first performs an initialization process so that broadcast waves can be normally received (S901). Next, it is confirmed whether or not a command is received from the copyright protection device control unit 120 (S902). If a command is received, a corresponding command process is performed (S903). Here, when the received command is an instruction to update and set transport_stream_id, update number, and encryption key information (hereinafter referred to as “key information update setting instruction”), the copyright protection device R1 receives the key information table 400 ( Referring to FIG. 4), it is confirmed whether the transport_stream_id of the data related to the key information update setting instruction matches the transport_stream_id item 402 of the key information table 400.

  Here, if the transport_stream_id of the data related to the key information update setting instruction matches the transport_stream_id item 402 of the key information table 400, it is checked whether the update number of the data related to the setting instruction is larger than the update number item 403. If the update number item 403 matches or is smaller than the update number item 403, the data related to the key information update setting instruction is discarded. On the other hand, when it is larger than the update number item 403, the update number item 403 and the encryption key item 404 of the key information table 400 are updated. When the transport_stream_id of the data related to the key information update setting instruction does not match the transport_stream_id item 402 of the key information table 400, the management number 401 is added, and the data is added to the taransport_stream_id item 402, the update number item 403, and the encryption key item 404. .

  As described above, the computer 1 receives the new encryption key information included in the broadcast wave via any of the tuners C1 to C3 by performing the encryption key information distribution setting processing S605 to S606 described above. In this case, the new encryption key information is distributed to the copyright protection devices R1 to R3, and the new encryption key information is updated and set in each copyright protection device R1 to R3. Therefore, for example, even when each of the tuners C1 to C3 receives a broadcast wave of another channel, when the new encryption key information regarding the broadcast wave of one channel is obtained, the obtained encryption key The key information is updated and set almost simultaneously in each of the copyright protection devices R1 to R3. As a result, encryption key information set (held) in each copyright protection device R1 to R3 can be synchronized.

  Also, according to the above-described termination processing S608 of the computer 1, in the unlikely event that the encryption key information distribution setting processing S605 to S606 is performed, the copyright protection devices R1 to R3 that have not received or set new encryption key information. Even if there is, the copyright protection device control unit 120 can selectively transmit new encryption key information to such a copyright protection device and efficiently perform update setting. Therefore, it is not necessary to always activate all the tuners C1 to C3 and the copyright protection devices R1 to R3, and the copyright protection device that has not been activated at the time of obtaining new encryption key information also has this encryption key information. Is distributed to the termination process S608. As a result, the encryption key information set in each copyright protection device R1 to R3 can be more reliably synchronized.

(Second Embodiment)
In the computer 1B according to the present embodiment, a key information table 500 as illustrated in FIG. 10 is stored in the FLASH 204 of each copyright protection device R1 to R3 in place of the key information table 400 in the first embodiment. Yes. In addition, in this computer 1B, the overlapping description is abbreviate | omitted about the structure same or equivalent to the computer 1 of 1st Embodiment.

  The management number item 501 of the key information table 500 is an identification number of encryption key information and is a different number. The confirmation data item 506 is data for confirming whether or not the input of the encryption key information has been completed for each of the copyright protection devices R1 to R3 connected by the internal bus 117. The copyright protection device R1 is LSB1bit, copyright The right protection device R2 assigns the second bit, and the copyright protection device R3 assigns the third bit. The confirmation data item 506 is output as ON (1) when data is output, and is OFF (0) when data input is completed. The Transport_stream_id item 502 is an ID identification added to the encryption key information. The update number item 503 is a number indicating the latest encryption key information received from the broadcast wave, and is used to determine whether the encryption key information included in the broadcast wave is updated. The update presence / absence item 504 is information indicating “1” when the key information is updated after activation of the copyright protection apparatus, “0” when the key information is not updated after activation, and is “0” when activated. "1" and set to "1" when updating. The encryption key item 505 is actual data of the encryption key information.

  The copyright protection device control unit 120B of the computer 1B performs an end process S608B shown in FIG. 11 instead of the end process S608 (FIG. 7) in the first embodiment. Hereinafter, the termination process S608B will be described with reference to FIGS.

  First, the copyright protection device control unit 120B provides a key to one copyright protection device (Rn (n = 1, 2, 3)) to be referred to among the copyright protection devices R1 to R3. An information output instruction is given, and key information input instructions are given to other copyright protection apparatuses (S802). First, n = 1 is set, and the copyright protection device control unit 120B instructs the copyright protection device R1 to output key information and also instructs the copyright protection devices R2 and R3 to input key information (S802). . Then, after confirming the processing completion response from the copyright protection devices R1 to R3 (S803), the copyright protection device control unit 120B issues a key information input stop instruction to the copyright protection devices R2 and R3 (S804). ).

  Further, the copyright protection device control unit 120B confirms the processing completion response from the copyright protection devices R2 and R3 (S805). After confirming the process completion response, the copyright protection apparatus control unit 120B moves the copyright protection apparatus Rn to be referred to next (here, n = 2), and performs the processes S802 to S805 in the same manner (S806). The copyright protection device control unit 120B repeats such processing S802 to S805 as all the copyright protection devices R1 to R3 as the reference copyright protection device Rn (S801), and then ends the processing.

  By such processing of the copyright protection device control unit 120B, each of the copyright protection devices R1 to R3 sequentially receives the key information output instruction and the key information input instruction as commands from the copyright protection device control unit 120B. Will do.

  When receiving the key information output instruction, the copyright protection device (referred to as the copyright protection device Ri) performs the key information sharing register output process shown in FIG.

  That is, the copyright protection device Ri refers to the update presence / absence item 504 in the key information table 500 (FIG. 10), and the encryption key data 505 corresponding to the management number 501 in which the update presence / absence item 504 is “1” (updated). Is determined to be output (S1102). Then, the copyright protection device Ri issues a Request request to the arbiter 116 (S1103), and confirms that permission is granted (S1105). If permission is not issued, the maximum number of arbiter confirmations is confirmed (S1104). If the maximum number of arbiter confirmations is exceeded, the copyright protection device Ri cancels the request to the arbiter 116 and performs error processing (S1106). Then, an error response is returned to the copyright protection device control unit 120B (S1110).

  When the request request permission from the aviator 116 is issued, the copyright protection device Ri checks the key information sharing register 201a (S1107). If the confirmation data in the key information sharing register 201a is OFF (0x00) (S1107), the copyright protection apparatus Ri writes the transport_stream_id 502, the update number 503, and the encryption key data 505 in the key information sharing register 201a ( If the confirmation data is not OFF (S1108), writing is not performed. When the copyright protection device Ri writes information to the key information sharing register 201a of its own device, it simultaneously applies to the key information sharing register 201a of two copyright protection devices other than the copyright protection device Ri. Always write the same information. Thereafter, the copyright protection device Ri sends a Request cancellation request to the arbiter 116 (S1109). Then, the copyright protection apparatus Ri edits the update presence / absence item 504 of the key information table 500 to “not updated” (0x00).

  The copyright protection device Ri repeats the above-described processing S1103 to S1109 for all the management numbers 501 in which the update presence / absence item 504 is “1” (updated), and then completes the processing in the copyright protection device control unit 120B. A response is returned (S1110), and the process ends.

  On the other hand, the copyright protection device (referred to as copyright protection device Rj) when the key information input instruction is received by the above-described processing of the copyright protection device control unit 120B is a key information sharing register as shown in FIG. 201a input processing and key information update processing are performed.

  That is, the copyright protection device Rj issues a Request request to the arbiter 116 (S1203), and confirms that permission is granted (S1205). If permission is not granted, the copyright protection device Rj confirms up to the maximum number of arbiter confirmations (S1204). If the maximum number of arbiter confirmations has been exceeded, the request is canceled to the arbiter 116, error processing is performed (S1206), and an error response is returned to the copyright protection device control unit 120 (S1211). When a request request is permitted from the arbiter 116, the copyright protection device Rj checks the data in the key information sharing register 201a, and checks whether the transport_stream_id of the data matches the transport_stream_id item 502 of the key information table 500 To do.

  Here, if the transport_stream_id of the data in the key information sharing register 201a matches the transport_stream_id item 502 of the key information table 500, the copyright protection device Rj has the update number of the data larger than the corresponding update number item 503. The key information table 500 is not updated when it is confirmed that the update number field 503 matches or is smaller than the update number field 503. On the other hand, when the update number of the data is larger than the corresponding update number item 503, the copyright protection device Rj updates the update number item 503 and the encryption key item 505 in the key information table 500. When the transport_stream_id of the data in the key information sharing register 201a does not match the transport_stream_id item 502 of the key information table 500, the copyright protection device Rj adds the management number 501 of the key information table 500, and updates the taransport_stream_id item 502, The data is added to the number item 503 and the encryption key item 505 (S1209).

  Then, the copyright protection device Rj writes the confirmation data OFF (0) corresponding to the copyright protection device Rj to the key information sharing register 201a, makes a request cancellation request to the arbiter 116 (S1210), and performs the initial processing S1210. Only the input start Response is returned to the host (S1210). The above processes S1203 to S1210 are repeated until a shared register input stop instruction is received (S1202). If a shared register input stop instruction is received (S1202), the copyright protection device Rj returns a shared register input stop Response to the host (S1211), and the process ends.

  As described above, in the computer 1B, the copyright protection device control unit 120B sends a key information output instruction to one of the copyright protection devices R1 to R3 (copyright protection device Ri), and A key information input instruction is transmitted to the other copyright protection device (copyright protection device Rj).

  Upon receiving the key information output instruction, the copyright protection device Ri outputs the encryption key information set in its own key information table 500, and the copyright protection device Rj receiving the key information input instruction receives the copyright information. The encryption key information output from the protection device Ri is input as necessary and updated in the key information table 500 of the own device. The encryption key information set in the copyright protection devices R1 to R3 is performed by changing the roles of the copyright protection devices Ri and Rj between the copyright protection devices R1 to R3. Are all updated to the latest. As a result, the computer 1B as described above can also synchronize the encryption key information in each of the copyright protection devices R1 to R3, similarly to the computer 1.

(Third embodiment)
In the computer 1 </ b> C according to the present embodiment, in the initialization process S <b> 901, the copyright protection devices R <b> 1 to R <b> 3 transmit / receive encryption key information held by themselves to each other via the internal bus 117 under the control of the arbiter 116. I do. Specifically, each copyright protection apparatus R1 to R3 performs the process shown in FIG. In addition, in this computer 1C, the overlapping description is abbreviate | omitted about the structure same or equivalent to the computer 1B of 1st Embodiment, or the computer 1B of 2nd Embodiment. In the following, the processing of the copyright protection device R1 will be mainly described, but the processing of the copyright protection devices R2 and R3 is also the same, and thus the redundant description is omitted.

  As shown in FIGS. 15 and 16, the copyright protection apparatus R1 refers to the update presence / absence item of the key information table 500 in the initialization process S901, and there is an item with update (update presence / absence = “1”). In (S1302), a Request request is issued to the arbiter 116 (S1303). When permission is given from the arbiter 116 (S1304), confirmation data in the key information sharing register 201a is confirmed (S1306). Here, when the confirmation data is OFF (0x00), the copyright protection apparatus R1 sets the value of the confirmation data 506 to 0xFF (all confirmation ON state), shares the transport_stream_id 502, the update number 503, and the encryption key data 505 with key information. Write to the register 201a and set the update presence / absence item of the key information table 500 to no update (0x00) (S1307). When the copyright protection device R1 writes information to the key information sharing register 201a of its own device, the same information is always written to the key information sharing register 201a of the copyright protection devices 2 and 3 at the same time. I do.

  On the other hand, when the confirmation data is not OFF (0x00) (S1306), the copyright protection device R1 confirms until the confirmation data is turned off. When this process is repeated and there is no updated item in the key information table 500 (S1305), the copyright protection apparatus R1 returns a Response to the host and cancels the Request to the arbiter 116 (S1310).

  If the permission of the arbiter 116 is not issued (S1304), the copyright protection device R1 checks the data in the key information sharing register 201a, and checks whether the transport_stream_id of this data matches the transport_stream_id item 502 of the key information table 500. Check. If they match, it is checked whether the update number of this data is larger than the corresponding update number item 503, and if it matches the corresponding update number item 503 or smaller than the corresponding update number item 503, the update is not performed. .

  On the other hand, when the update number of this data is larger than the corresponding update number item 503, the update number item 503 and the encryption key item 505 of the key information table 500 are updated. When the transport_stream_id of this data does not match the transport_stream_id item 502 of the key information table 500, the management number 501 of the key information table 500 is added, and this data is added to the taransport_stream_id item 502, the update number item 503, and the encryption key item 505. (S1309). Further, confirmation data OFF (0) corresponding to the copyright protection device is written into the key information sharing register 201a. That is, the copyright protection device R1 sets the first bit of the confirmation data to 0. (Note that in the case of processing of the copyright protection device R2, the second bit of the confirmation data is set to 0, and in the case of processing of the copyright protection device R3, the third bit of the confirmation data is set to 0). The device R1 confirms whether or not there is an initial completion instruction from the copyright protection device control unit 120 (S1301), and if there is, ends the initialization process.

  By such processing of each copyright protection device R1 to R3, all the encryption key information set in the copyright protection devices R1 to R3 is updated. Therefore, the computer 1C as described above can also synchronize the encryption key information set in each copyright protection device R1 to R3, similarly to the computers 1 and 1B.

  The present invention is not limited to the above-described embodiments. For example, the process of each embodiment for synchronizing the encryption key information set in each copyright protection device R1 to R3 (hereinafter collectively referred to as “encryption key synchronization process”) is performed in the initialization process. Alternatively, it may be performed in the termination process, may be performed in the middle of the command process, or may be performed periodically at regular time intervals. Moreover, each encryption key synchronization process shown to each embodiment may be performed independently, may be combined suitably, and may be performed all.

  In each embodiment, the computer 1 includes three copyright protection devices. However, the information processing apparatus of the present invention may include two or more copyright protection devices. In each embodiment, the copyright protection device control units 120, 120B, and 120C receive and analyze the broadcast wave and perform encryption key information distribution setting processing S605 to S606. However, the copyright protection devices R1 to R3 perform the encryption key information distribution setting processing S605 to S606. A broadcast wave may be received and analyzed.

  In each embodiment, the copyright protection device controller 120 and the copyright protection devices R1 to R3 are configured separately, but the function of the copyright protection device controller 120 is incorporated in the copyright protection devices R1 to R3. Alternatively, the functions of the copyright protection devices R1 to R3 may be incorporated in the copyright protection device control unit 120. In each embodiment, the copyright protection devices R1 to R3 manage the transport_stream_id, the update number, and the encryption key. However, other information (for example, device ID information) may be managed. .

It is a block diagram which shows the computer which is 1st Embodiment of the information processing apparatus of this invention. It is a block diagram which shows the copyright protection apparatus shown by FIG. It is a figure which shows a key information management table. It is a figure which shows a key information table. It is a block diagram which shows the process which sets encryption key information to each copyright protection apparatus. It is a flowchart which shows the process of the copyright protection apparatus control part shown by FIG. It is a flowchart which shows the completion | finish process shown by FIG. 6 in detail. It is a block diagram which shows the completion | finish process shown by FIG. It is a flowchart which shows the process of each copyright protection apparatus. It is a figure which shows the key information management table in the computer of 2nd Embodiment. It is a flowchart which shows the completion | finish process performed in the copyright protection apparatus control part in the computer of 2nd Embodiment. It is a block diagram which shows the completion | finish process of the computer of 2nd Embodiment. It is a flowchart which shows the process of the copyright protection apparatus which received the key information output instruction | indication in FIG. It is a flowchart which shows the process of the copyright protection apparatus which received the key information input instruction in FIG. It is a flowchart which shows the initialization process performed with each copyright protection apparatus in the computer of 3rd Embodiment. It is a block diagram which shows the initialization process of the computer of 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1B, 1C ... Computer, 116 ... Arbiter, 120, 120B ... Copyright protection apparatus control part (copyright protection apparatus control means), 300, 500 ... Key information management table (key information management information), 400 ... Key information Table, 305, 404... Encryption key information, C1, C2, C3... Digital tuner, R1, R2, R3.

Claims (5)

Multiple digital tuners that receive digital broadcast waves,
A plurality of copyright protection devices connected to each of the digital tuners and each holding encryption key information used for decrypting the digital broadcast;
Copyright protection device control means for controlling processing related to the encryption key information of each copyright protection device,
Each copyright protection device transmits broadcast wave information obtained through the digital tuner to the copyright protection device control means,
The copyright protection device control means transmits the encryption key information included in the broadcast wave information received from any of the copyright protection devices to all the copyright protection devices at the same time. Information processing device. The copyright protection device control means includes:
Holding key information management information indicating the update status of the encryption key information in each copyright protection device;
Based on the key information management information, selectively transmitting the latest of the predetermined encryption key information selectively to a copyright protection device that does not hold the latest of the predetermined encryption key information. The information processing apparatus according to claim 1. The copyright protection device control means includes:
Sending an encryption key information output instruction to one of the plurality of copyright protection devices, and inputting encryption key information to the copyright protection device other than the one copyright protection device Send instructions,
The copyright protection device that has received the encryption key information output instruction outputs the encryption key information held by itself,
The copyright protection device that has received the encryption key information input instruction inputs and manages the encryption key information output from the copyright protection device that has received the encryption key information output instruction. The information processing apparatus according to claim 1 or 2. An arbiter that exclusively controls communication between the copyright protection devices;
A register for sharing information between the copyright protection devices,
The information according to any one of claims 1 to 3, wherein each of the copyright protection devices exclusively transmits and receives the encryption key information held by the respective devices under the control of the arbiter. Processing equipment. Multiple digital tuners that receive digital broadcast waves,
A plurality of copyright protection devices connected to each of the digital tuners and each holding encryption key information used for decrypting the digital broadcast;
In an information processing method in an information processing device comprising: a copyright protection device control unit that controls processing related to the encryption key information of each copyright protection device;
Each copyright protection device transmitting the broadcast wave information obtained through the digital tuner to the copyright protection device control means;
The copyright protection device control means, simultaneously transmitting the encryption key information included in the broadcast wave information received from any of the copyright protection devices to all the copyright protection devices. An information processing method characterized by that.

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