JP2014216901A - Reproduction device, relay device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reproduction device, relay device, and program for preventing a viewing disabled period from being generated in association with updating a key.SOLUTION: A reproduction device includes: an acceptance unit for accepting generation identification information on a key for reproducing broadcast content of digital broadcasting, through a communication network; an update unit for updating a key held in the reproduction device, on the basis of the accepted generation identification information; and a reproduction unit for reproducing the broadcast content by using the updated key. A relay device includes: a storage unit for storing the generation identification information on the key held in the reproduction device of the digital broadcasting; a determination unit which extracts generation identification information on a key for reproducing broadcast content from a broadcast wave of the digital broadcasting, and determines whether or not the extracted generation identification information agrees with the stored generation identification information; and a notification unit for notifying the reproduction device of the extracted generation identification information through the communication network, when the extracted generation identification information does not agree with the stored generation identification information.

Description

  The present technology relates to a decoding technology for digital broadcasting.

  In a digital broadcasting system that can be used only by a specific playback device, a broadcast station sends out encrypted content using a digital broadcast wave, and the playback device decrypts and plays back the content contained in the received digital broadcast wave. . Therefore, the broadcasting station and the playback device have a common key.

  If the key is leaked, the broadcast station switches to a new key and encrypts the content. Further, the broadcast station notifies the generation identification information of the key indicating that the key has been switched using a digital broadcast wave. Upon receiving the key generation identification information, the playback device switches to a new key and decrypts the content based on the key generation identification information. Such key switching is performed for each channel.

  However, since the key generation identification information is periodically transmitted at intervals, the playback device side may not be able to temporarily receive the key generation identification information. When the key generation identification information is not received, the playback device may not be able to play back immediately after receiving the digital broadcast wave.

  A document discloses a technique for determining the possibility of key switching based on digital broadcast waves of other channels. When determining that there is a possibility of key switching, the playback device causes the other receivers connected via the bus to receive the key generation identification information and obtains the key generation identification information from the other receivers. To do. In this way, a playback apparatus that receives only one channel can cope with key switching in advance.

  However, even if this technology is used, after the broadcast station switches the key, if the playback device has not received any digital broadcast wave including other channels, playback may be temporarily disabled. .

JP 2010-81113 A JP 2011-217292 A

  An object of the present technology is, in one aspect, to prevent an unviewable period associated with a key update from occurring.

  A playback apparatus according to one aspect updates a key held by itself based on a reception unit that receives generation identification information of a key for playing broadcast content of a digital broadcast via a communication network, and the received generation identification information And an update unit that reproduces broadcast content using the updated key.

  A relay apparatus according to one aspect extracts a key generation identification information for reproducing broadcast content from a broadcast wave of a digital broadcast, a storage unit that stores key generation identification information held by a digital broadcast reproduction apparatus, A determination unit that determines whether or not the extracted generation identification information matches the stored generation identification information, and the extracted generation identification information when the extracted generation identification information does not match the stored generation identification information Is notified to the playback device via the communication network.

  As one aspect, it is possible to prevent an unviewable period due to the key update.

FIG. 1 is a diagram showing an outline of processing in a broadcasting station. FIG. 2 is a diagram showing an outline of processing in the receiver. FIG. 3 is a diagram illustrating a retransmission cycle of a device key update EMM (Entitlement Management Message). FIG. 4 is a diagram illustrating a configuration example of a reproduction system via the Internet. FIG. 5 is a diagram illustrating a configuration example of a reproduction system via a LAN (Local Area Network). FIG. 6 is a diagram illustrating a sequence example. FIG. 7 is a diagram illustrating a module configuration example of the playback device. FIG. 8 is a diagram illustrating an example of a channel table. FIG. 9 is a diagram illustrating a module configuration example of the relay apparatus. FIG. 10 is a diagram illustrating an example of the request source table. FIG. 11 is a diagram illustrating an example of a request processing flow. FIG. 12 is a diagram illustrating an example of a registration processing flow. FIG. 13 is a diagram illustrating an example of a processing flow during reception. FIG. 14 is a diagram illustrating a configuration of the device key update EMM. FIG. 15 is a diagram illustrating an example of a determination processing flow. FIG. 16 is a diagram illustrating an example of a notification processing flow. FIG. 17 is a diagram illustrating a configuration of the work key setting EMM. FIG. 18 is a diagram illustrating an example of an update process flow. FIG. 19 is a diagram illustrating an example of a reproduction processing flow. FIG. 20 is a diagram illustrating a hardware configuration example of a smartphone. FIG. 21 is a functional block diagram of a computer.

  A terrestrial digital broadcast conditional access system based on a content rights protection method will be described.

  First, processing in the broadcasting station 101 will be described. FIG. 1 shows an outline of processing in the broadcast station 101. The broadcast station 101 transmits the encrypted content with a digital broadcast wave.

  The program content 103 is scrambled by a scramble key 107 in a scramble unit 105. As a result, scrambled program content 109 is generated.

  The scramble key 107 is encrypted by the scramble key encryption unit 111 with the work key 113. As a result, an encrypted scramble key 115 is generated. The generated encrypted scramble key 115 is included in an ECM (Entitlement Control Message) 117. The ECM 117 is data common to all receivers. The ECM 117 is mainly used to transmit program information with the ECM 117.

  The work key 113 is encrypted with the device key 121 by the work key encryption unit 119. The device key 121 used at this time is a key corresponding to the type of receiver. Therefore, the device key 121 is associated with a device ID that identifies the type of receiver. The type of receiver may correspond to the receiver provider. Further, since the device key 121 may be updated, it is further associated with the generation number of the device key.

  As a result of the encryption, an encrypted work key 123 is generated. At this time, a work key 123 encrypted with a different key for each type of receiver is generated. The generated encrypted work key 123 is included in the work key setting EMM 125 in association with the device ID. The work key setting EMM 125 is data unique to the device ID. The work key setting EMM 125 is mainly used for transmitting the encrypted work key 123.

  The scrambled program content 109, the ECM 117, and the work key setting EMM 125 are included in the digital broadcast wave and are transmitted from the transmission unit 133. When the device key 121 is not updated, the scrambled program content 109, the ECM 117, and the work key setting EMM 125 are transmitted.

  However, when the device key 121 is leaked, the device key 121 is switched in order to prevent reproduction by an unauthorized receiver. At this time, the device key update unit 127 generates a new device key 121. The new device key 121 is determined according to the new generation number. The new device key 121 is the same as the device key 121 generated by the receiver of the type specified by the device ID based on the generation number. The device key updating unit 127 may generate the device key 121 by the same procedure as the procedure in the type of receiver specified by the device ID each time. Alternatively, the device key update unit 127 may acquire the device key 121 corresponding to the generation number from the provider of the receiver.

  The generation number 129 of the new device key 121 is included in the device key update EMM 131 in association with the device ID. The device key update EMM 131 is included in the digital broadcast wave and is transmitted from the transmission unit 133. The device key update EMM 131 is data unique to the device ID, like the work key setting EMM 125. The work key setting EMM 125 is mainly used for transmitting the sending unit 133. This is the end of the description of the processing in the broadcast station 101.

  Next, processing in the receiver 201 that receives a digital broadcast wave will be described. FIG. 2 shows an outline of processing in the receiver 201. The decoding unit 203 extracts the scrambled program content 109 from the received signal. The scrambled program content 109 is descrambled by the scramble key 205 in the descramble unit 205. As a result, program content 209 is generated. The program content 209 is played and video and audio are output.

  The decoding unit 203 extracts the ECM 117 from the received signal. The encrypted scramble key 115 included in the ECM 117 is decrypted by the work key 213 in the scramble key decryption unit 211. As a result, a scramble key 207 is generated.

  The decoding unit 203 extracts the work key setting EMM 125 from the received signal. The encrypted work key 123 included in the work key setting EMM 125 is decrypted by the device key 217 by the work key decryption unit 215. As a result, a work key 213 is generated.

  That is, the work key 213 is generated from the device key 217 and the work key setting EMM 125, the scramble key 207 is generated from the work key 213 and the ECM 117, and the program content 209 is scrambled with the scramble key 207. Is generated. Thus, unauthorized use is prevented if the device key 217 is kept secret.

  When the device key 217 is leaked, the device key generation unit 219 generates a new device key 217 according to the generation number 129 included in the device key update EMM 131 extracted by the decoding unit 203 from the received signal. At this time, the device key generation unit 219 reads the generation number 129 corresponding to its own device ID from the device key update EMM 131. In this way, the receiver 201 supports switching of the device key 217. This is the end of the description of the processing in the receiver 201.

  Next, the retransmission cycle of the device key update EMM 131 will be described. FIG. 3 shows a retransmission cycle of the device key update EMM 131. The retransmission period of the device key update EMM 131 is operated so as to be, for example, 15 seconds or less. Accordingly, when the receiver 201 starts receiving the device key update EMM 131 soon after it is transmitted, the device key update EMM 131 is waited until the next transmission timing. That is, even if the device key generation unit 219 is switched, a generation number for specifying a new device key generation unit 219 cannot be obtained for about 15 seconds depending on the conditions. Therefore, the program content 209 may not be obtained during this time.

  When the key is updated, a transition period corresponding to the old key may be provided. During this transition period, playback is not disabled, but when the transition period has passed, playback may not be possible. If the frequency of receiving digital broadcasts is low, it may be assumed that the transition period has passed. This is the end of the description of the retransmission period of the device key update EMM 131.

  Next, the configuration of the playback system according to the present embodiment will be described. FIG. 4 shows a configuration example of a playback system via the Internet. In the present embodiment, a transfer device that transfers a key generation number and additional information (such as an EMM that includes an encrypted work key) and a playback device that plays back content using the generation number of the transferred key are provided. . The smartphone 401a and the smartphone 401b illustrated in FIG. 4 are examples of playback devices. A notebook PC 403, a digital TV (Television) 405, and a DVD (Digital Versatile Disk) recorder 407 are examples of transfer devices.

  In this example, the key generation number is transferred via the Internet. Therefore, the notebook PC 403, the digital TV 405, and the DVD recorder 407 are connected to the smartphone 401a and the smartphone 401b via the Internet. When the key generation number is transferred from the playback device to the transfer device, the generation identifier determination information is transferred together with the key generation number. Further, when the key generation number is transferred from the transfer device to the playback device, the additional information is transferred together with the key generation number.

  The playback device may receive a key generation number and additional information from one transfer device. In this case, the key generation number and additional information are received from any one of the notebook PC 403, the digital TV 405, and the DVD recorder 407.

  The playback device may receive a key generation number and additional information from a plurality of transfer devices. In this case, the key generation number and additional information are received from a plurality of devices of the notebook PC 403, the digital TV 405, and the DVD recorder 407.

  In this example, the key generation number and additional information are transferred by mail. The mail server 409 operates to temporarily store the mail received from the transfer device and forward the mail to the playback device. This is the end of the description of the configuration of the playback system.

  A configuration example of another reproduction system will also be described. FIG. 5 shows a configuration example of a playback system via a LAN (DLNA (Digital Living Network Alliance) connection or the like). Similar to the configuration of FIG. 4, a transfer device that transfers the key generation number and additional information, and a playback device that plays back the content using the transferred key generation number and additional information are provided. Similar to the configuration of FIG. 4, the smartphone 401 a and the smartphone 401 b illustrated in FIG. 5 are examples of playback devices. A notebook PC 403, a digital TV 405, and a DVD recorder 407 are examples of transfer devices.

  In this example, the key generation number and additional information are transferred via the LAN. Therefore, the notebook PC 403, the digital TV 405, and the DVD recorder 407 are connected to the smartphone 401a and the smartphone 401b via the LAN.

  Similar to the configuration of FIG. 4, the playback device may receive a key generation number and additional information from one transfer device. In this case, the key generation number and additional information are received from any one of the notebook PC 403, the digital TV 405, and the DVD recorder 407.

  Similar to the configuration of FIG. 4, the playback device may accept a key generation number and additional information from a plurality of transfer devices. In this case, the key generation number and additional information are received from a plurality of devices of the notebook PC 403, the digital TV 405, and the DVD recorder 407.

  In this example, the key generation number and additional information are transferred by notification of device cooperation such as DLNA. The access point 501 controls device cooperation among the smartphone 401a, the smartphone 401b, the notebook PC 403, the digital TV 405, the DVD recorder 407, and the access point 501. For example, when the transfer device participates in device cooperation while the playback device is participating in device cooperation, a key generation number and generation identifier determination information are notified from the playback device to the transfer device via the access point 501. Alternatively, when the playback device participates in device cooperation in a state where the transfer device is participating in device cooperation, a key generation number and additional information are notified from the playback device to the transfer device via the access point 501. The access point 501 may hold a notification to be transferred, and pass the notification when the playback apparatus participates in device cooperation.

  In this example, the smartphone 401a and the smartphone 401b are playback devices, but the smartphone 401a and the smartphone 401b may be transfer devices. In this example, the notebook PC 403, the digital TV 405, and the DVD recorder 407 are transfer devices, but the notebook PC 403, the digital TV 405, and the DVD recorder 407 may be playback devices. Also, another form of device such as a tablet terminal may be a playback device or a transfer device. Furthermore, the playback device may also serve as a transfer device. This is the end of the description of the configuration of the playback system.

  Next, the sequence in the present embodiment will be described. FIG. 6 shows a sequence example. FIG. 6 shows a data flow between the playback device 601, the relay device 603, and the broadcast station 101. FIG. 6 also shows an overview of the processing of the playback device 601, the relay device 603, and the broadcast station 101. As described above, the playback device 601 is, for example, the smartphone 401a or the smartphone 401b. The relay device 603 is, for example, a notebook PC 403, a digital TV 405, or a DVD recorder 407.

  The playback device 601 performs a request process (S601). At this time, the playback device 601 transmits request data to the relay device 603 via the Internet or LAN, and requests the relay device 603 to transfer the key generation number and additional information (S603). In this example, the key generation number is specifically the generation number of the device key 217. Details will be described later with reference to FIG.

  The relay apparatus 603 that has received the request data performs a registration process (S605). At this time, the relay device 603 adds the request data itself to the storage request source table. Details will be described later with reference to FIG. Thus, the device key 217 is ready for updating.

  Assume that the broadcasting station 101 performs device key update processing in this state (S607). As described above, the broadcast station 101 transmits a broadcast signal including the device key update EMM 131 (S609).

  The relay apparatus 603 that has received the broadcast signal performs a process during reception (S611). The receiving process includes a determination process (S613) and a notification process (S615). In the determination process, the relay apparatus 603 determines whether or not to transfer the generation number of the device key 217 and additional information to the requesting playback apparatus 601 (S613). When it is determined that the generation number and additional information of the device key 217 are transferred to the requesting playback apparatus 601, the relay apparatus 603 sends the generation number and addition of the device key 217 to the requesting playback apparatus 601 in the notification process. Information is transferred (S615). At this time, the generation number and additional information of the device key 217 are included in the notification data. The notification data is transmitted via the Internet or LAN (S617). Details of the receiving process (S611) will be described later with reference to FIG. Details of the determination process (S613) will be described later with reference to FIG. Details of the notification process (S615) will be described later with reference to FIG.

  The playback device 601 that has received the notification data performs an update process (S619). At this time, a new device key 217 is generated according to the generation number of the device key 217 included in the notification data, and a work key for reproducing content is prepared based on the new device key 217 and additional information. Details will be described later with reference to FIG.

  Thereafter, when the playback device 601 starts receiving a broadcast signal transmitted from the broadcast station 101 (S623), the playback device 601 performs playback processing (S621). In the playback process, the playback device 601 plays back the content. Details will be described later with reference to FIG. This is the end of the description of the sequence.

  Next, the module configuration of the playback device 601 will be described. FIG. 7 shows a module configuration example of the playback device 601. The playback apparatus 601 includes a request unit 701, a reception unit 703, a storage unit 705, an update unit 707, a channel selection unit 709, a tuner unit 711, a playback unit 713, an output unit 715, and a decoding unit 203.

  The request unit 701 transmits request data to the relay apparatus 603 via the Internet or a LAN, and requests the relay apparatus 603 to transfer a key generation number and additional information. That is, the request unit 701 is a module that performs the request process (S601) shown in FIG.

  The accepting unit 703 accepts the notification data shown in FIG. 6 (S617).

  The storage unit 705 stores a device ID, a channel table, a mail address, and a device ID. The device ID is an ID for identifying the type of the playback device 601 itself. The channel table is a table including data related to reproduction of each channel. The e-mail address is the e-mail address of the playback device 601 itself. The device ID is an ID for identifying the playback device 601 itself by the device cooperation described in FIG.

  Here, the channel table will be described. FIG. 8 shows an example of the channel table. The channel table has a record for each channel. The record has a channel number field, a generation number field, a device key field, a work key field, and a scramble key field.

  A number for identifying a channel is set in the channel number field. A generation number of the device key 217 is set in the generation number field. A device key 217 used for reproduction in the channel is set in the device key field. A work key used for reproduction in the channel is set in the work key field. In the scramble key field, a scramble key used for reproduction on the channel is set.

  In this example, the first record includes the device key “Kd1 (1)” generated based on the generation number “N1 (1)” and the device key “Kd1 (1)” for the channel with the channel number “C1”. ”And the scramble key“ Ks1 ”decrypted with the work key“ Kw1 ”are set.

  Similarly, the second record includes the device key “Kd1 (2)” generated based on the generation number “N1 (2)” and the device key “Kd1 (2)” for the channel with the channel number “C2”. And the scramble key “Ks2” decrypted by the work key “Kw2” and the work key “Kw2” are set.

  Similarly, in the third record, the device key “Kd1 (1)” generated based on the generation number “N1 (1)” and the device key “Kd1 (1)” for the channel with the channel number “C3” are included. And the scramble key “Ks3” decrypted by the work key “Kw3” and the work key “Kw3” are set.

  The generation number and device key 217 may differ depending on the channel. If the key is leaked in a specific area, it is also assumed that the key is updated only for the channel in the specific area. This completes the description of the channel table.

  Returning to the description of the module configuration example of the playback device 601 illustrated in FIG. 7, the update unit 707 generates a new device key 217 according to the generation number of the device key 217 included in the notification data, and based on the new device key 217. Prepare to play the content. That is, the update unit 707 is a module that performs the update process (S619) illustrated in FIG. The update unit 707 includes the device key generation unit 219 and the work key decryption unit 215 shown in FIG.

  The channel selection unit 709 selects a channel by a user operation, for example. The tuner unit 711 receives the broadcast wave of the channel selected by the channel selection unit 709. As shown in FIG. 2, the decoding unit 203 extracts the scrambled program content 109, ECM 117, work key setting EMM 125, and device key update EMM 131 from the received broadcast wave.

  The reproduction unit 713 reproduces content. That is, the reproduction unit 713 is a module that performs the reproduction process (S621) illustrated in FIG. The reproduction unit 713 includes the scramble key decryption unit 211 and the descrambling unit 205 shown in FIG.

  The output unit 715 outputs the reproduced content. The output unit 715 outputs, for example, content video and content audio. In the case of digital radio broadcasting, content audio is output.

  The decoding unit 203, the request unit 701, the reception unit 703, the storage unit 705, the update unit 707, the channel selection unit 709, the tuner unit 711, the reproduction unit 713, and the output unit 715 are realized by, for example, hardware resources shown in FIG. Is done. In addition, the decoding unit 203, the request unit 701, the reception unit 703, the update unit 707, the channel selection unit 709, the tuner unit 711, the reproduction unit 713, and the output unit 715 store part or all of the processing of the module in the storage unit 2003. The program loaded in (FIG. 20) may be realized by sequentially executing the program by the processor 2001 (FIG. 20). This is the end of the description of the module configuration of the playback device 601.

  Next, the module configuration of the relay apparatus 603 will be described. FIG. 9 shows a module configuration example of the relay apparatus 603. The relay device 603 includes a tuner unit 711, a decoding unit 203, a registration unit 901, a storage unit 903, a determination unit 905, an update unit 907, and a notification unit 909. The tuner unit 711 and the decoding unit 203 of the relay device 603 are the same as the tuner unit 711 and the decoding unit 203 of the reproduction device 601 shown in FIG.

  The registration unit 901 adds the request data to the storage request source table. That is, the registration unit 901 is a module that performs the registration process (S605) illustrated in FIG.

  The storage unit 903 stores a request source table. The request source table will be described. FIG. 10 shows an example of the request source table. The request source table has a record for each playback device 601 that is the request source. The record has a mail address field, a device ID field, and a device ID field. In the mail address field, the mail address of the playback apparatus 601 that is the request source is set. In the device ID field, the device ID of the playback apparatus 601 that is the request source is set. In the device ID field, a device ID for identifying the type of the playback apparatus 601 that is the request source is set.

  The record further has a channel number field and a generation number field for each channel. A number for identifying a channel is set in the channel number field. In the generation number field, the generation number of the device key 217 used for reproduction of the channel by the reproduction apparatus 601 as the request source is set. Information for determining the generation number is set in the generation identifier determination information field.

  In the first record, the playback of the channel with the channel number “C1” is performed for the playback device 601 whose mail address is “abc@xxx.jp”, the device ID is “M1”, and the device ID is “D1”. This indicates that the device key 217 having the generation number “N1 (1)” determined by the generation identifier determination information “G1 (1)” is used. Further, the first record uses the device key 217 with the generation number “N1 (2)” determined by the generation identifier determination information “G1 (2)” for reproduction of the channel with the channel number “C2”. Show. Further, the first record uses the device key 217 with the generation number “N1 (1)” determined by the generation identifier determination information “G1 (1)” for reproduction of the channel with the channel number “C3”. Show.

  The second record is used to reproduce the channel with the channel number “C1” with respect to the reproducing apparatus 601 whose mail address is “def@xxx.jp”, the device ID is “M2”, and the device ID is “D2”. This indicates that the device key 217 having the generation number “N2 (1)” determined by the generation identifier determination information “G2 (1)” is used. Further, the second record uses the device key 217 with the generation number “N2 (1)” determined by the generation identifier determination information “G2 (1)” for reproduction of the channel with the channel number “C2”. Show. Further, the second record uses the device key 217 with the generation number “N2 (2)” determined by the generation identifier determination information “G2 (2)” for reproduction of the channel with the channel number “C3”. Show.

  In the request source table, the generation number and the generation identifier determination information may differ depending on the channel. This completes the description of the request source table.

  Returning to the description of the module configuration example of the relay apparatus 603 illustrated in FIG. 9, the determination unit 905 determines whether or not to transfer the generation number of the device key 217 to the requesting playback apparatus 601. That is, the determination unit 905 is a module that performs the determination process (S613) illustrated in FIG.

  The update unit 907 updates the request source table when the generation number of the device key 217 is switched.

  When the notification unit 909 determines to transfer the generation number of the device key 217 to the requesting playback apparatus 601, the relay apparatus 603 transfers the generation number of the device key 217 to the requesting playback apparatus 601 in the notification process. To do. That is, the notification unit 909 is a module that performs the notification process (S615) illustrated in FIG.

  The tuner unit 711, the decoding unit 203, the registration unit 901, the storage unit 903, the determination unit 905, and the update unit 907 are realized by, for example, hardware resources illustrated in FIG. Further, the tuner unit 711, the decoding unit 203, the registration unit 901, the determination unit 905, and the update unit 907 transfer a part or all of the processing of the module to the CPU 2503 (FIG. 21). ) May be executed in sequence. Further, the relay device 603 does not have to include a reproduction unit that reproduces the digital broadcast. This is the end of the description of the module configuration of the relay device 603.

  Next, processing of the playback device 601 and the relay device 603 will be described. First, the request process of the playback device 601 shown in S601 of FIG. 6 will be described. FIG. 11 shows an example of a request processing flow.

  The request unit 701 reads the device ID from the storage unit 705 (S1101), and further reads the generation number for each channel from the storage unit 705 (S1103). In addition, the request unit 701 reads the mail address and the device ID from the storage unit 705 (S1105). The request unit 701 transmits request data (including a mail address, a device ID, a device ID, and a generation number for each channel) to the relay apparatus 603 (S1107). The request data is transmitted to the relay device 603 by e-mail via the Internet, for example. Alternatively, the request data is transmitted to the relay device 603 by, for example, notification of device cooperation via the LAN.

  In the case where notification by e-mail is not received, the e-mail address may not be included in the request data. In the case where notification by device cooperation is not received, the device ID may not be included in the request data. This completes the description of the request process.

  The registration process shown in S605 of FIG. 6 will be described. FIG. 12 shows an example of a registration process flow. The registration unit 901 receives the request data via the Internet or LAN as described above (S1201). The registration unit 901 adds a new record to the request source table stored in the storage unit 903, and sets the request data as a new record (S1203). At this time, the registration unit 901 sets the email address included in the request data in the email address field of the new record. The registration unit 901 sets the device ID included in the request data in the device ID field of the new record. The registration unit 901 sets the generation number for each channel included in the request data in the generation number field corresponding to the channel number of the new record.

  When the request data is received by mail via the Internet, the registration unit 901 may set the mail address of the sender of the mail in the mail address field of the new record. Further, when the request data is received by the device cooperation notification via the LAN, the registration unit 901 may set the device ID of the notification transmission source in the device ID field of the new record. . This is the end of the description of the registration process.

  Next, the receiving process shown in S611 of FIG. 6 will be described. FIG. 13 shows an example of a processing flow during reception. The determination unit 905 waits for extraction of the device key update EMM 131 by the decoding unit 203 (S1301).

  Here, the configuration of the device key update EMM 131 will be described. FIG. 14 shows the configuration of the device key update EMM 131. The device key update EMM 131 includes a plurality of EMM main bodies 1403 in addition to the header part 1401 and the error detection code 1411. A device ID 1405 is set in the EMM main body 1403. That is, the EMM main body 1403 is data for the playback device 601 specified by the device ID 1405. Further, the EMM main body 1403 includes a device key update descriptor 1407. The device key update descriptor 1407 is data used when generating a device key on the playback device 601 side. The device key update descriptor 1407 includes a generation number 1409. The generation number 1409 corresponds to the generation number 129 shown in FIGS. This is the end of the description of the configuration of the device key update EMM 131.

  Returning to the description of the processing flow during reception shown in FIG. 13, when the device key update EMM 131 is extracted by the decoding unit 203, the determination unit 905 selects one requesting playback device 601 (S1303). For example, the determination unit 905 sequentially specifies records in the request source table.

  The determination unit 905 performs determination processing (S1305). The determination process shown in S613 of FIG. 6 will be described. FIG. 15 shows an example of the determination processing flow. The determination unit 905 identifies the device ID of the request source from the record of the request source table (S1501). The determination unit 905 identifies the EMM body 1403 with the matching device ID in the device key update EMM 131 (S1503). The determination unit 905 extracts the generation number from the identified EMM main body 1403 (S1505). The determination unit 905 identifies the generation number of the request source from the record of the request source table (S1507). The determination unit 905 determines whether the generation number of the request source matches the extracted generation number (S1509). If it is determined that the generation number of the request source matches the extracted generation number, the determination unit 905 determines “not notify” (S1511).

  On the other hand, if it is determined that the generation number of the request source does not match the extracted generation number, the determination unit 905 determines “notify” (S1513).

  The update unit 907 updates the generation number of the request source in the record of the request source table (S1515). That is, the update unit 907 rewrites the extracted generation number. This is the end of the description of the determination process.

  Returning to the explanation of the processing flow during reception shown in FIG. 13, the notification unit 909 determines whether the determination result is “notify” or “not notify” (S1307). When it is determined that the determination result is “not notify”, the notification unit 909 does not perform notification processing.

  On the other hand, when it is determined that the determination result is “notify”, the notification unit 909 performs notification processing. (S1309).

  The notification process shown in S615 of FIG. 6 will be described. FIG. 16 shows an example of the notification processing flow. The notification unit 909 extracts a device key update descriptor from the EMM main body 1403 specified in S1503 (S1601). Then, the notification unit 909 waits for the extraction of the work key setting EMM 125 by the decoding unit 203 (S1603).

  Here, the configuration of the work key setting EMM 125 will be described. FIG. 17 shows the configuration of the work key setting EMM 125. The work key setting EMM 125 includes a plurality of EMM main bodies 1703 in addition to the header portion 1701 and the error detection code 1711. A device ID 1705 is set in the EMM main body 1703. That is, the EMM main body 1703 is data for the playback device 601 specified by the device ID 1705. The EMM main body 1703 includes a work key setting descriptor 1707. The work key setting descriptor 1707 is data used when the request unit 701 decrypts the work key. The work key setting descriptor 1707 includes an encrypted work key 1709. The encrypted work key 1709 corresponds to the encrypted work key 123 shown in FIGS. This is the end of the description of the configuration of the work key setting EMM 125.

  When the work key setting EMM 125 is extracted by the decoding unit 203, the notification unit 909 searches for the device ID of the request source specified in S1501, and from the EMM main body 1703 having the device ID 1705 that matches the device ID of the request source. The setting descriptor 1707 is extracted (S1605). The notification unit 909 transmits notification data (including a channel number, a device key update descriptor, and a work key setting descriptor) by mail via the Internet or by notification of device cooperation via the LAN (S1607). . When sending notification data by mail via the Internet, the notification unit 909 specifies a mail address from a record in the request source table, and specifies the specified mail address as a destination. When transmitting notification data by notification of device cooperation via the LAN, the notification unit 909 specifies a device ID from a record in the request source table, and specifies the specified device ID as a destination. This is the end of the description of the notification process.

  Returning to the description of the processing flow during reception shown in FIG. 13, the determination unit 905 determines whether or not an unprocessed request source remains (S1311). If it is determined that an unprocessed request source remains, the process returns to S1303 to continue the process for the playback device 601 that is an unprocessed request source.

  On the other hand, if it is determined that there is no unprocessed request source, the process returns to S1301, and the above-described process is repeated. This is the end of the description of the receiving process.

  Next, the update process shown in S619 of FIG. 6 will be described. FIG. 18 shows an example of the update process flow. The accepting unit 703 accepts notification data from the relay device 603 (S1801). Specifically, the accepting unit 703 receives notification data by mail via the Internet or by notification of device cooperation via the LAN. The update unit 707 extracts a channel number and a generation number from the received notification data (S1803). As shown in FIG. 14, the generation number 1409 is included in the device key update descriptor 1407. The update unit 707 identifies the record of the channel number from the channel table, and rewrites the generation number of the record (S1805). The update unit 707 generates a device key 217 based on the generation number (S1807). Specifically, the device key generation unit 219 specifies the device key 217 for the generation number, for example, according to a secret association or a secret calculation procedure. When receiving a plurality of generation numbers, the update unit 707 uses the latest generation number. The update unit 707 rewrites the device key 217 of the record specified in S1805 (S1809). The update unit 707 extracts the encrypted work key from the received notification data (S1811). As shown in FIG. 17, the encrypted work key 1709 is included in the work key setting descriptor 1707. The update unit 707 decrypts the work key (S1813). Specifically, the work key decryption unit 215 decrypts the encrypted work key with the device key 217. The update unit 707 rewrites the work key of the record specified in S1805 (S1815). This is the end of the description of the update process.

  Finally, the reproduction process shown in S621 of FIG. 6 will be described. FIG. 19 shows an example of the playback processing flow. The playback unit 713 repeats descrambling on the scrambled content extracted by the decoding unit 203 (S1901). This process is continued during the processes of S1903 to S1909. Specifically, the descrambling unit 205 specifies the record of the channel in the channel record, and descrambles the scrambled content with the scramble key included in the specified record. Note that descrambling is an aspect of decoding.

  The reproducing unit 713 waits for the ECM 117 to be extracted by the decoding unit 203 (S1903). When the ECM 117 is extracted by the decoding unit 203, the reproducing unit 713 determines whether or not to update the scramble key (S1905). If it is determined that the scramble key is updated, the reproducing unit 713 decrypts the scramble key (S1907). Specifically, the scramble key decryption unit 211 decrypts the encrypted scramble key 115 included in the ECM 117 with the work key included in the record of the channel in the channel record to obtain a scramble key. The reproducing unit 713 rewrites the scramble key of the record specified in S1901 (S1909). Thereafter, descrambling is repeated using the rewritten new scramble key. This is the end of the description of the playback process.

  FIG. 20 shows a hardware configuration example of the smartphone 401. The smartphone 401 includes a processor 2001, a storage unit 2003, an antenna 2011, a wireless control unit 2013, an audio control unit 2015, a speaker 2017, a microphone 2019, a display 2021, a touch pad 2023, a key group 2025, a broadcast receiving unit 2027, and a broadcasting antenna 2029. have.

  The processor 2001 may include a modem CPU (Central Processing Unit) and an application CPU. The storage unit 2003 includes, for example, a ROM (Read Only Memory) 2005, a RAM (Random Access Memory) 2007, and a flash memory 2009. The ROM 2005 stores programs such as applications and preset data, for example. The RAM 2007 includes an area for developing a program such as an application. The RAM 2007 also includes an area for storing temporary data. The flash memory 2009 stores, for example, preset data and data to be held.

  The touch pad 2023 is, for example, a panel-shaped sensor arranged on the display screen of the display 2021, and receives an instruction by a touch operation. The display 2021 displays, for example, a program screen. Specifically, the display 2021 and the touch pad 2023 are used as an integrated touch panel. A touch event is generated by a touch operation on the touch pad 2023. The touch pad 2023 is an example of a pointing device (position input device). Each hard key of the key group 2025 is provided in a part of the housing.

  The antenna 2011 receives wireless data such as a cellular method, a wireless LAN, and a near field communication method. The wireless control unit 2013 controls wireless communication. By controlling wireless communication, telephone voice communication and mail data communication are performed.

  The audio control unit 2015 performs analog / digital conversion and digital / analog conversion on sound data. The speaker 2017 outputs analog data as sound. The speaker 2017 outputs, for example, a program sound. The microphone 2019 converts sound into analog data.

  The broadcast receiving unit 2027 has a tuner unit 711 and a decoding unit 203. Broadcast antenna 2029 receives digital broadcast waves.

  According to the present embodiment, the device key 217 on the playback device 601 side is updated based on the generation number of the device key 217 received via the Internet or LAN. It can be avoided. For example, even when the broadcasting station 101 receives a digital broadcast wave for the first time after switching the device key 217, the playback device 601 can immediately play back the content. Also, since the generation number of the device key 217 is received from the relay apparatus 603 that has been requested to relay the generation number of the device key 217 in advance, it is determined whether or not the device key 217 is updated on the playback apparatus 601 side. The device key 217 can be updated in a timely manner without doing so.

  Also, for example, when the device key 217 is updated a plurality of times in a short period of time and an old generation number is received together with a new generation number from a single or a plurality of relay devices 603, the playback device 601 generates the current device key 217. Can do.

  When the broadcast station 101 switches the device key 217, the relay apparatus 603 can prompt the playback apparatus 601 to update the device key 217 to update the device key 217. Therefore, the playback apparatus 601 does not have to determine whether the device key 217 has been updated. Furthermore, the playback device 601 does not require an auxiliary receiving module.

  Also, when the broadcast station 101 switches the device key 217 again, the relay apparatus 603 can prompt the playback apparatus 601 that should update the device key 217 again to update the device key 217.

  Although one embodiment of the present technology has been described above, the present technology is not limited to this. For example, the functional block configuration described above may not match the actual program module configuration.

  Further, the configuration of each storage area described above is an example, and the above configuration is not necessarily required. Further, in the processing flow, the processing order can be changed if the processing result does not change. Further, it may be executed in parallel.

  Note that the playback device 601 and the relay device 603 described above may be computer devices. As shown in FIG. 25, the computer device includes a memory 2501, a CPU (Central Processing Unit) 2503, a hard disk drive (HDD) 2505, a display control unit 2507 connected to the display device 2509, and a removable disk 2511. The drive device 2513, the input device 2515, the communication control unit 2517 for connecting to the network, and the broadcast receiving unit 2519 are connected by a bus 2523. The broadcast receiving unit 2519 is connected to the broadcast antenna 2521. An operating system (OS) and an application program for executing the processing in this embodiment are stored in the HDD 2505, and are read from the HDD 2505 to the memory 2501 when executed by the CPU 2503. The CPU 2503 controls the display control unit 2507, the communication control unit 2517, and the drive device 2513 according to the processing content of the application program, and performs a predetermined operation. Further, data in the middle of processing is mainly stored in the memory 2501, but may be stored in the HDD 2505. In an embodiment of the present technology, an application program for performing the above-described processing is stored in a computer-readable removable disk 2511 and distributed, and installed from the drive device 2513 to the HDD 2505. In some cases, the HDD 2505 may be installed via a network such as the Internet and the communication control unit 2517. Such a computer apparatus realizes various functions as described above by organically cooperating hardware such as the CPU 2503 and the memory 2501 described above and programs such as the OS and application programs. .

  The broadcast receiving unit 2519 includes a tuner unit 711 and a decoding unit 203, for example. Broadcast antenna 2521 receives digital broadcast waves.

  The embodiment of the present invention described above is summarized as follows.

  The playback apparatus according to the present embodiment receives a key generation identification information for playing back broadcast content of a digital broadcast via a communication network, and a key held by itself based on the received generation identification information. And an update unit that updates the broadcast content using the updated key.

  In this way, since the key on the playback device side is updated based on the key generation identification information received via the communication network, it is possible to prevent an unviewable period associated with the key update. For example, even when the broadcast station receives a digital broadcast wave for the first time after switching the key, the content can be immediately reproduced. Also, if the key generation identification information is received from the relay apparatus that has been requested to relay the key generation identification information in advance, the playback apparatus side does not determine whether the key is updated or not. , You will be able to update the key in a timely manner.

  In addition, when the plurality of generation identification information is received, the updating unit may update the key held by itself based on the latest generation identification information.

  In this way, for example, when the key is updated a plurality of times in a short period of time and old generation identification information is received together with new generation identification information from a single or a plurality of relay apparatuses, the current key can be generated.

    The relay device according to the present embodiment extracts a key generation identification information for reproducing broadcast content from a broadcast wave of a digital broadcast, and a storage unit that stores key generation identification information held by the digital broadcast reproduction device A generation unit that determines whether the extracted generation identification information matches the stored generation identification information, and the extracted generation when the extracted generation identification information does not match the stored generation identification information. A notification unit that notifies the playback apparatus of the identification information via the communication network.

  In this way, when the broadcast station switches the key, it is possible to prompt the playback apparatus that should update the key to update the key. Therefore, the playback device does not have to determine whether the key has been updated. Further, the playback device does not require an auxiliary receiving module.

  Furthermore, when the extracted generation identification information is different from the stored generation identification information, an update unit that updates the generation identification information stored in the storage unit may be provided.

  In this way, even when the broadcasting station switches the key again, it is possible to prompt the playback apparatus that should update the key again to update the key.

  The storage unit may further store the type of the playback device. Further, the determination unit may extract generation identification information of a key corresponding to the type.

  In this way, it is possible to prompt the playback apparatus that should update the key corresponding to the type of the playback apparatus to update the key.

  A program for causing a processor or a computer to perform the processing by the above method can be created, and the program can be stored in a computer-readable storage such as a flexible disk, a CD-ROM, a magneto-optical disk, a semiconductor memory, and a hard disk. It may be stored in a medium or a storage device. Note that intermediate processing results are generally temporarily stored in a storage device such as a main memory.

  The following supplementary notes are further disclosed with respect to the embodiments including the above examples.

(Appendix 1)
A reception unit that receives generation identification information of a key for reproducing broadcast content of digital broadcasting via a communication network;
An update unit that updates the key held by itself based on the received generation identification information;
And a playback unit that plays back the broadcast content using the updated key.

(Appendix 2)
The playback apparatus according to claim 1, wherein the update unit updates the key held by itself based on the latest generation identification information when a plurality of the generation identification information is received.

(Appendix 3)
A storage unit for storing generation identification information of a key held in a playback apparatus for digital broadcasting;
A determination unit that extracts generation identification information of the key for reproducing broadcast content from the broadcast wave of the digital broadcast, and determines whether the extracted generation identification information matches the stored generation identification information When,
And a notification unit configured to notify the reproduction device of the extracted generation identification information via a communication network when the extracted generation identification information does not match the stored generation identification information.

(Appendix 4)
Furthermore,
The relay device according to supplementary note 3, further comprising: an update unit that updates the generation identification information stored in the storage unit when the extracted generation identification information is different from the stored generation identification information.

(Appendix 5)
The storage unit further stores the type of the playback device,
The relay device according to appendix 3 or 4, wherein the determination unit extracts the generation identification information of the key corresponding to the type.

(Appendix 6)
Processing for receiving generation identification information of a key for reproducing digital broadcast content via a communication network;
Based on the received generation identification information, a process of updating the key held by itself,
A program for causing a computer to execute a process of playing back the broadcast content using the updated key.

(Appendix 7)
In a computer having a storage unit for storing generation identification information of a key held in a playback device for digital broadcasting,
A process of extracting generation identification information of the key for reproducing broadcast content from the broadcast wave of the digital broadcast, and determining whether the extracted generation identification information matches the stored generation identification information; ,
When the extracted generation identification information does not match the stored generation identification information, a program for executing the process of notifying the playback device of the extracted generation identification information via a communication network.

(Appendix 8)
Processing for receiving generation identification information of a key for reproducing digital broadcast content via a communication network;
Based on the received generation identification information, a process of updating the key held by itself,
And a process of playing back the broadcast content using the updated key.

(Appendix 9)
A relay method by a relay device having a storage unit for storing generation identification information of a key held in a digital broadcast playback device,
A process of extracting generation identification information of the key for reproducing broadcast content from the broadcast wave of the digital broadcast, and determining whether the extracted generation identification information matches the stored generation identification information; ,
And a process of notifying the playback device of the extracted generation identification information via a communication network when the extracted generation identification information does not match the stored generation identification information.

(Appendix 10)
A storage unit for storing generation identification information of a key held in a playback apparatus for digital broadcasting;
A determination unit that extracts generation identification information of the key for reproducing broadcast content from the broadcast wave of the digital broadcast, and determines whether the extracted generation identification information matches the stored generation identification information When,
A relay device comprising: a notification unit that notifies the playback device of the extracted generation identification information when the extracted generation identification information does not match the stored generation identification information;
A receiving unit that receives the notified generation identification information via the communication network;
An update unit that updates the key held by itself based on the received generation identification information;
And a playback unit that plays back the broadcast content using the updated key.

101 broadcast station 103 program content 105 scramble unit 107 scramble key 109 scrambled program content 111 scramble key encryption unit 113 work key 115 encrypted scramble key 117 ECM 119 work key encryption unit 121 device key 123 encrypted Work key 125 Work key setting EMM 127 Device key update unit 129 Generation number 131 Device key update EMM
133 Sending unit 201 Receiver 203 Decoding unit 205 Descramble unit 207 Scramble key 209 Program content 211 Scramble key decryption unit 213 Work key 215 Work key decryption unit 217 Device key 219 Device key generation unit 401 Smart phone 403 Notebook PC 405 Digital TV
407 DVD recorder 409 mail server 501 access point 601 playback device 603 relay device 701 request unit 703 reception unit 705 storage unit 707 update unit 709 channel selection unit 711 tuner unit 713 playback unit 715 output unit 901 registration unit 903 storage unit 905 determination unit 907 Update unit 909 Notification unit 1401 Header unit 1403 EMM main body 1405 Device ID 1407 Device key update descriptor 1409 Generation number 1411 Error detection code 1701 Header unit 1703 EMM main body 1705 Device ID 1707 Work key setting descriptor 1709 Encrypted work key 1711 Error detection code 2001 processor 2003 storage unit 2005 ROM 2007 RAM
2009 Flash Memory 2011 Antenna 2013 Wireless Control Unit 2015 Audio Control Unit 2017 Speaker 2019 Microphone 2021 Display 2023 Touchpad 2025 Key Group 2027 Broadcast Reception Unit 2029 Broadcast Antenna 2501 Memory 2503 CPU 2505 Hard Disk Drive 2507 Display Control Unit 2509 Display Device 2511 Removable Device 2511 Disk 2513 Drive device 2515 Input device 2517 Communication control unit 2519 Broadcast reception unit 2519 Broadcast antenna 2523 Bus

Claims (7)

A reception unit that receives generation identification information of a key for reproducing broadcast content of digital broadcasting via a communication network;
An update unit that updates the key held by itself based on the received generation identification information;
And a playback unit that plays back the broadcast content using the updated key. The playback device according to claim 1, wherein, when the plurality of generation identification information is received, the update unit updates the key held by itself based on the latest generation identification information. A storage unit for storing generation identification information of a key held in a playback apparatus for digital broadcasting;
A determination unit that extracts generation identification information of the key for reproducing broadcast content from the broadcast wave of the digital broadcast, and determines whether the extracted generation identification information matches the stored generation identification information When,
And a notification unit configured to notify the reproduction device of the extracted generation identification information via a communication network when the extracted generation identification information does not match the stored generation identification information. Furthermore,
The relay device according to claim 3, further comprising: an updating unit that updates the generation identification information stored in the storage unit when the extracted generation identification information is different from the stored generation identification information. The storage unit further stores the type of the playback device,
The relay apparatus according to claim 3 or 4, wherein the determination unit extracts the generation identification information of the key corresponding to the type. Processing for receiving generation identification information of a key for reproducing digital broadcast content via a communication network;
Based on the received generation identification information, a process of updating the key held by itself,
A program for causing a computer to execute a process of playing back the broadcast content using the updated key. In a computer having a storage unit for storing generation identification information of a key held in a playback device for digital broadcasting,
A process of extracting generation identification information of the key for reproducing broadcast content from the broadcast wave of the digital broadcast, and determining whether the extracted generation identification information matches the stored generation identification information; ,
When the extracted generation identification information does not match the stored generation identification information, a program for executing the process of notifying the playback device of the extracted generation identification information via a communication network.

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