JP4818320B2 - Recording apparatus and control method thereof - Google Patents

Description

  The present invention relates to a recording apparatus for recording digital broadcast content and a control method thereof.

  The access control method in Japanese digital broadcasting is defined by the standard “ARIB STD-B25 version 5.1” of the Japan Radio Industry Association (ARIB).

  In the B-CAS method, an IC card (B-CAS card) in which a master key and a unique ID number are stored is used. For this reason, a receiver that is not properly equipped with a B-CAS card cannot release the digital broadcast scramble, and cannot view or record the digital broadcast content.

  The receiver takes out an ECM (Entlement Control Message) and an EMM (Entlement Management Message) multiplexed on the broadcast signal and sends them to the IC card. The ECM is information common to the receivers, and the EMM is individual information for each receiver. The receiver decrypts the EMM using the master key, and extracts the work key and contract information. Then, the ECM is decrypted using the work key, and a scramble key and program attribute information are extracted. Next, the contract information and the program attribute information are collated, and when there is a right to view the content, the digital broadcast content is decrypted using the scramble key.

  Even free broadcasts such as terrestrial digital broadcasts cannot be viewed unless a regular IC card (B-CAS card) is attached. The EMM is also used for viewing control of pay broadcast content, and the pay broadcast content cannot be viewed unless a contracted IC card is attached. A contractor of pay broadcast contents can view the contracted pay broadcast if the contracted IC card is owned. For example, if a contractor wants to watch a pay broadcast contracted at a friend's house, he / she can watch it by bringing his / her IC card into the friend's house and attaching it to the receiver (for example, see Patent Document 1).

Also, in order to solve the copyright protection problem associated with illegal duplication of content, a method of descrambling the broadcast signal as it is recorded and played back has been proposed. (For example, refer to Patent Document 2).
JP-A-4-138735 JP 2000-115091 A

  Here, if the user owns a plurality of receivers, if the viewing contract is made so that the pay broadcast contents can be viewed on all the receivers, the contract cost becomes high. There is a case to do. In this case, if necessary, the contracted pay broadcast content can be viewed by any receiver by replacing the IC card with the viewing contract with a receiver for viewing the broadcast.

  However, if you make a reservation for recording paid broadcast content with a receiver and replace the IC card with a viewing contract with another receiver, you must insert the IC card before making a recording reservation. I have to bring it back. For this reason, there is a problem that the recording reservation cannot be executed if the IC card is not returned before the recording reservation is executed.

  Therefore, an object of the present invention is to provide a recording apparatus and a recording control method capable of appropriately controlling whether to scramble and record digital broadcast content or to record without releasing scramble. To do.

  In order to solve the above-described problem, a recording apparatus according to an embodiment of the present invention is a recording apparatus that records digital broadcast content reserved for recording, and a receiving unit that receives the scrambled digital broadcast content. The descrambling means for descrambling the digital broadcast content using the IC card storing the information for descrambling, and the IC card mounted when the recording reservation of the digital broadcast content is set Determining means for determining whether or not the digital broadcast content to be recorded can be unscrambled based on whether or not the digital broadcast content is mounted when the digital broadcast content is recorded. If it is determined, the digital broadcast content reserved for recording Control means for controlling the recording to be recorded without releasing the scramble of the digital broadcast content reserved for recording when it is determined that the scramble cannot be released by the determining means. It is characterized by providing.

  A control method according to an embodiment of the present invention is a control method for a recording apparatus for recording digital broadcast content reserved for recording, the receiving step for receiving scrambled digital broadcast content, and the digital broadcast content. Whether or not the digital broadcast content to be recorded can be unscrambled based on whether or not the IC card installed when the recording reservation is set is installed when performing recording of the digital broadcast content If it is determined that the scramble can be canceled, the digital broadcast content reserved for recording is unscrambled and recorded, and if it is determined that the scramble cannot be canceled, the recording is reserved. Control to record without unscramble digital broadcast content Characterized in that it comprises a that control step.

  According to the present invention, it is possible to appropriately control whether to scramble and record digital broadcast content or to record without releasing scramble.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a broadcast receiving apparatus 100 according to Embodiment 1 of the present invention. Examples of the broadcast receiving apparatus 100 include a digital television receiver having a recording function and a recorder having a digital broadcast recording function.

  The receiving unit 101 is a tuner module that receives a digital broadcast signal via an antenna, and outputs a signal in a transport stream (TS) format. The descrambling unit 102 extracts ECM and EMM from the TS signal output from the receiving unit 101 and passes them to the IC card unit 103.

  An IC card (B-CAS card) storing a master key and a unique ID number is attached to the IC card unit 103, and the IC card is detachable. The received EMM is filtered by the ID number of the IC card, and the EMM addressed to itself is sent to the IC card unit 103. The IC card unit 103 decrypts the EMM using the master key of the IC card, and extracts the work key and contract information. Then, the ECM is decrypted using the work key, and the scramble key and program attribute information (program name, etc.) are extracted. Next, the contract information and the program attribute information are collated, and if there is the right to view the content, the scramble key is passed to the descrambling unit 102. The descrambling unit 102 descrambles (descrambles) the TS signal using the scramble key.

  The demultiplexing unit (DeMUX) 104 separates the video signal and the audio signal from the multiplexed TS signal. The MPEG decoding unit 105 decodes (decodes) a video signal and an audio signal encoded by MPEG (Moving Picture Experts Group).

  The display unit 106 is configured by a liquid crystal display, a plasma display, or the like, and displays the video decoded by the MPEG decoding unit 105. However, the display unit 106 may be connected to the outside of the broadcast receiving apparatus 100. The speaker 107 outputs the audio decoded by the MPEG decoding unit 105.

  The determination unit 108 acquires contract information and program attribute information from the IC card unit 103, and collates them to determine whether or not an IC card with a digital broadcast content viewing contract is installed.

  The recording / playback control unit 109 is constituted by, for example, an integrated circuit such as a CPU and a RAM, a ROM, or a microcomputer having the same function as these. The recording / playback control unit 109 performs control related to recording and playback of digital broadcast content based on the determination result by the determination unit 108. The recording unit 110 is configured with, for example, a hard disk or a flash memory, and stores recorded digital broadcast content.

  The operation unit 111 includes buttons and a cross key for instructing the operation of the broadcast receiving apparatus 100 by a user operation. However, the operation part 111 may be comprised by the remote controller which can operate the broadcast receiving apparatus 100 remotely. The user can set recording reservation for digital broadcast content by operating the buttons on the operation unit 111.

  Message generator 112 generates a message in accordance with an instruction from recording / playback controller 109. The generated message is displayed on the display unit 106 via the MPEG decoding unit 105.

  FIG. 2 is a flowchart showing the recording operation of the broadcast receiving apparatus 100 shown in FIG. In step S201, the recording / playback control unit 109 determines whether there is a recording request. If there is a recording request, the process proceeds to step S202. Here, when there is a recording request, for example, when the recording start time of a reserved program is reached (or a time before the recording start time), the automatic recording start time of the favorite program is set. It is assumed that this happens.

  In step S202, the determination unit 108 acquires contract information and program attribute information from the IC card unit 103, and determines whether or not an IC card with a digital broadcast content viewing contract is installed by collating them. Specifically, first, it is determined whether or not an IC card is attached to the IC card unit 103. As a determination method, determination may be made based on the presence or absence of a response from the IC card, or a card insertion / removal detection mechanism may be provided. If an IC card is installed, it is determined whether or not the IC card has a viewing contract for a broadcast program requested to be recorded. The “IC card with a viewing contract” is not limited to an IC card with a pay broadcast viewing contract, but a regular B-CAS for viewing a free broadcast such as a terrestrial digital broadcast. Includes cards.

  Here, if it is determined that an IC card with a digital broadcast content viewing contract is attached (YES), the process proceeds from step S202 to step S203. In step S203, the descrambling unit 102 uses the scramble key to release the scramble of the TS signal, and the recording / playback control unit 109 records the descrambled digital broadcast content. The recorded digital broadcast content is stored in the recording unit 110. For example, if the IC card attached to the IC card unit 103 is not inserted / removed when the recording reservation of the digital broadcast content is set, it is determined that the IC card with the digital broadcast content viewing contract is attached, This step S203 is executed.

  On the other hand, if it is determined that the IC card with the digital broadcast content viewing contract is not attached (NO), the process proceeds from step S202 to step S204. In step S204, the recording / playback control unit 109 records the digital broadcast content that has not been descrambled. That is, control is performed so that the TS signal output from the receiving unit 101 is stored in the recording unit 110. For example, if the IC card attached to the IC card unit 103 is removed when the recording reservation of the digital broadcast content is set, it is determined that the IC card with the digital broadcast content viewing contract is not attached. This step S204 is executed.

  Note that the recording / playback control unit 109 may record the descrambled digital broadcast content as it is in the MPEG2-TS format. The data may be transcoded into H.264 format data. When digital broadcast content that has not been descrambled is recorded, the TS signal output from the receiving unit 101 is stored in the recording unit 110 without being transcoded.

  FIG. 3 is a flowchart showing the reproduction operation of the broadcast receiving apparatus 100 shown in FIG. In step S211, the recording / playback control unit 109 determines whether there is a playback request. If there is a playback request, the process proceeds to step S212. Here, the case where there is a reproduction request is, for example, a case where the user presses the reproduction button of the operation unit 111.

  In step S212, the recording / playback control unit 109 determines whether or not the content requested to be played is descrambled content. If the content requested to be reproduced is descrambled content (YES), the process proceeds to step S213, and control is performed so that the content is decoded and reproduced. That is, control is performed so that content is read from the recording unit 110 and output to the display unit 106 and the speaker 107 via the demultiplexing unit 104 and the MPEG decoding unit 105.

  On the other hand, if the requested content is not descrambled content (NO), the process proceeds from step S212 to step S214. In step S214, the determination unit 108 acquires the contract information and the program attribute information from the IC card unit 103, and compares them to determine whether or not an IC card that has contracted to view the content requested to be played is installed. To do.

  If it is determined that an IC card with a viewing contract for the content requested to be played is attached (YES), the process proceeds from step S214 to step S215. In step S215, the recording / playback control unit 109 controls the content to be descrambled and decoded and played back. That is, control is performed such that content is read from the recording unit 110 and output to the display unit 106 and the speaker 107 via the descrambling unit 102, the demultiplexing unit 104, and the MPEG decoding unit 105.

  On the other hand, if it is determined that the IC card with the viewing request for the content requested to be played is not attached (NO), the process proceeds from step S214 to step S216. In step S216, the message generation unit 112 generates a warning message that prompts the user to install an IC card that has a viewing contract for the content requested to be played. The generated message is displayed on the display unit 106 via the MPEG decoding unit 105. As a warning message when the IC card is not installed, for example, “IC card is not installed. Please insert an IC card to play back content” is possible. For example, “An IC card with a viewing contract is not installed. An IC card with a viewing contract for the content to be played is installed.” Please do ".

  Therefore, according to the first embodiment, it is possible to appropriately control whether to scramble the digital broadcast content reserved for recording and to record without releasing the scramble. As a result, for example, after making a reservation for recording of pay broadcast content with a viewing contract on a certain receiver, replace the IC card with another receiver and use it, and forget to return the IC card before executing the recording reservation. Even in such a case, it is possible to execute a recording reservation. In addition, when there is a request to reproduce content that has not been descrambled, it is possible to view the content without any problem by controlling to descramble and play using the contracted IC card. .

  If an IC card is removed when there is a broadcast program reserved for recording, a warning message such as “Are you sure you want to record without releasing scramble? Are you sure?” May be displayed. In this case, the IC card unit 103 detects the insertion / extraction of the IC card, and the message generation unit 112 generates the warning message.

  In addition, when an IC card is inserted, it may be controlled to automatically descramble and re-record content that has not been descrambled in the recording unit 110. In this case, the recording / playback control unit 109 reads the undescrambled content in the recording unit 110 and controls the descrambling unit 102 to release the scramble.

(Embodiment 2)
A new RMP (Rights Management and Protection) method that performs access control by software without using hardware such as an IC card as described in the first embodiment has been proposed. The provisions on the new RMP method were added to Part 3 “Control Method at the Time of Reception (Content Protection Method)” of the standard “ARIB STD-B25 Version 5.1” of the Radio Industries Association (ARIB). In the new RMP method, a device key is used to decrypt a work key transmitted by the EMM. The device key is a key determined for each model of the broadcast receiving apparatus, and is generated from the EMM using a generation algorithm stored in advance in the broadcast receiving apparatus. In the new RMP method, the EMM is determined and transmitted for each broadcaster.

  Since the broadcast receiving apparatus compatible with the new RMP method does not require an IC card, it is smaller and less expensive than the conventional broadcast receiving apparatus compatible with the B-CAS method. On the other hand, since the new RMP system is a system that performs limited reception control for each model, it is not possible to perform pay broadcasting that requires an individual contract for each receiver. In view of this, it is conceivable to connect an external B-CAS tuner compatible with pay broadcast reception when the user wishes to view the pay broadcast with a broadcast receiving apparatus compatible with the new RMP system.

  FIG. 4 is a block diagram showing a schematic configuration of broadcast receiving apparatus 300 and external tuner apparatus 311 according to Embodiment 2 of the present invention, and is a figure compared with FIG. Blocks that perform the same operations as those of the broadcast receiving apparatus 100 in FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted. In addition, the receiving unit 312, the descrambling unit 313, and the IC card unit 314 in the external tuner device 311 have the same configurations as the receiving unit 101, the descrambling unit 102, and the IC card unit 103 described in FIG. The description is omitted.

  A new RMP receiving unit 301 in the broadcast receiving apparatus 300 is a tuner module compatible with the new RMP method. The new RMP descrambler 302 extracts the ECM and EMM from the TS signal output from the new RMP receiver 301, generates a scramble key, and descrambles (descrambles) the TS signal using the scramble key. . Also, the contract information and program attribute information of the digital broadcast content are extracted from the TS signal and passed to the determination unit 303.

  The determination unit 303 determines whether or not an IC card with a viewing contract for digital broadcast content is attached to the IC card unit 314 in the external tuner device 311. The recording / playback control unit 304 performs control related to recording and playback of digital broadcast content based on the determination result by the determination unit 303.

  FIG. 5 is a flowchart showing the recording operation in the second embodiment. In step S401, the recording / playback control unit 304 determines whether there is a recording request. If there is a recording request, the process proceeds to step S402. Here, when there is a recording request, for example, when the recording start time of a reserved program is reached (or a time before the recording start time), the automatic recording start time of the favorite program is set. It is assumed that this happens.

  In step S <b> 402, the determination unit 303 determines whether or not an IC card with a viewing contract for digital broadcast content is attached to the IC card unit 314 in the external tuner device 311. Specifically, first, it is determined whether or not the external tuner device 311 is connected to the broadcast receiving device 300. If the external tuner device 311 is connected, whether or not the IC card is mounted on the IC card unit 314. Determine if. If an IC card is installed, it is determined whether or not the IC card has a viewing contract for a broadcast program requested to be recorded.

  Here, if the IC card for which the digital broadcast content is subscribed is attached to the IC card unit 314 in the external tuner device 311 (YES), the process proceeds from step S402 to step S403. In step S403, the descrambling unit 313 in the external tuner device 311 cancels the scramble of the TS signal output from the receiving unit 312 using the scramble key, and the recording / playback control unit 304 performs the descrambled digital signal. Record broadcast content. The recorded digital broadcast content is stored in the recording unit 110.

  On the other hand, if the IC card with the digital broadcast content viewing contract is not attached to the IC card unit 314 in the external tuner device 311 (NO), the process proceeds from step S402 to step S404. In step S404, the recording / playback control unit 304 records the digital broadcast content that has not been descrambled. That is, the TS signal output from the new RMP receiving unit 301 in the broadcast receiving apparatus 300 is controlled to be stored in the recording unit 110. However, the TS signal output from the receiving unit 312 in the external tuner device 311 may be stored in the recording unit 110.

  The content reproduction operation is the same as the operation described with reference to FIG. When the content requested to be reproduced is descrambled content, the recording / reproduction control unit 304 controls the recording / reproduction control unit 304 to decode and reproduce the content. That is, control is performed so that content is read from the recording unit 110 and output to the display unit 106 and the speaker 107 via the demultiplexing unit 104 and the MPEG decoding unit 105. On the other hand, if the content requested to be played is not descrambled content, the recording / playback control unit 109 controls the content to be descrambled and decoded for playback. That is, control is performed so that content is read from the recording unit 110 and output to the display unit 106 and the speaker 107 via the descrambling unit 313, the demultiplexing unit 104, and the MPEG decoding unit 105.

  Therefore, in the second embodiment, the same effect as in the first embodiment can be obtained in the configuration using the broadcast receiving apparatus 300 and the external tuner apparatus 311 compatible with the new RMP method.

It is a block diagram which shows schematic structure of the broadcast receiver which concerns on Embodiment 1 of this invention. It is a flowchart which shows the video recording operation | movement of the broadcast receiver shown in FIG. It is a flowchart which shows the reproduction | regeneration operation | movement of the broadcast receiver shown in FIG. It is a block diagram which shows schematic structure of the broadcast receiver which concerns on Embodiment 2 of this invention, and an external tuner apparatus. 10 is a flowchart showing a recording operation in the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Broadcast receiving apparatus 101 Receiving part 102 Descramble part 103 IC card 104 Demultiplexing part (DeMUX)
105 MPEG Decode 106 Display Unit 107 Speaker 108 Judgment Unit 109 Recording / Playback Control Unit 110 Recording Unit 111 Operation Unit 112 Message Generation Unit

Claims (6)

A recording device for recording digital broadcast content reserved for recording,
Receiving means for receiving scrambled digital broadcast content;
Descrambling means for descrambling digital broadcast content using an IC card storing information for descrambling;
Descramble the digital broadcast content to be recorded based on whether the IC card that was installed when the recording reservation of the digital broadcast content was set is installed when the digital broadcast content is recorded Determination means for determining whether or not it is possible;
When it is determined by the determination means that the scramble can be canceled, the scramble of the digital broadcast content reserved for recording is canceled and recorded by the descramble means, and when the determination means determines that the scramble cannot be canceled Comprises a control means for controlling to record without releasing the scramble of the digital broadcast content reserved for recording.   The descrambling means takes out a scramble key included in the digital broadcast content using a master key stored in the IC card, and releases the scramble of the digital broadcast content using the scramble key. The recording apparatus according to 1.   The control means, after recording without releasing the scramble of the digital broadcast content reserved for recording, when the IC card that was installed when setting the recording reservation of the digital broadcast content is installed, 3. The recording apparatus according to claim 1, wherein control is performed so that scrambling of the recorded digital broadcast content is canceled by the descrambling means. It further comprises operation means for instructing playback of the recorded digital broadcast content,
When the operation means instructs the reproduction of the digital broadcast content recorded without releasing the scramble, the determination means determines that the IC card attached when the recording reservation of the digital broadcast content is set It is determined whether the digital broadcast content instructed to be played can be unscrambled based on whether it is attached, and the control means can release the scramble of the digital broadcast content instructed to be played. 4. The recording according to claim 1, wherein the digital broadcast content is scrambled by the descrambling unit and is played back when the determination is made. apparatus.   5. The recording apparatus according to claim 4, further comprising a message generation unit that generates a warning message when it is determined by the determination unit that the scramble of the digital broadcast content instructed to be played cannot be released. . A control method for a recording device for recording digital broadcast content reserved for recording,
Receiving a scrambled digital broadcast content;
Descramble the digital broadcast content to be recorded based on whether the IC card that was installed when the recording reservation of the digital broadcast content was set is installed when the digital broadcast content is recorded A determination step for determining whether or not it is possible;
When it is determined that the scramble can be canceled, the scrambled digital broadcast content is unscrambled and recorded. When it is determined that the scramble cannot be canceled, the scrambled digital broadcast content is scrambled. And a control step for controlling to record without releasing.

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