JP2011239054A - Broadcast receiver and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broadcast receiver and a control method thereof to prevent illegal viewing of contents.SOLUTION: A digital broadcast receiver 100 applies a billing authentication system using a B-CAS card 115. A content management section 107 manages card ID and content ID by storing card ID of the B-CAS card 115, which is associated with a broadcast program, in a storage section 111 when recording the broadcast program. When contents stored in the storage section 111 is reproduced, a content reproduction control section 112 determines whether the stored card ID, which is associated with the contents, is equal to the card ID of the B-CAS card inserted in the device. When the card ID at a recording time is different from the one at a reproducing time, the content reproduction control section 112 prohibits or restricts reproduction of the contents.

Description

  The present invention relates to a broadcast receiving apparatus that performs user authentication processing and a control method thereof.

  2. Description of the Related Art Conventionally, there are services for content distribution such as music and video and streaming playback performed via a network using an information terminal such as a personal computer. To view paid content, a billing process and purchase of a viewing license are required, and it is necessary to issue a user ID and password by the authentication server and to input and transmit user information such as name, address, and billing method. When the user purchases the content, the authentication server associates and registers the user ID and the purchased content, and delivers the content to the terminal when the requesting user determines that the viewing license has been purchased in response to a content viewing request. To do. A technique for preventing unauthorized viewing of paid content in a distribution service is known. In the billing authentication technology of the video rental distribution service disclosed in Patent Document 1, the server manages unique information for each terminal device, thereby restricting distribution to a plurality of terminal devices and preventing unauthorized viewing. In the system shown in Patent Document 2, the authentication server manages not only the user ID but also a terminal ID based on the manufacturer name, model number, and manufacturing number as terminal information and a content ID for identifying the content in a database. The authentication server distributes content to a terminal having a terminal ID used by a user having a registered user ID.

  By the way, the Radio Industry Association (ARIB) is studying advanced BS digital broadcasting systems, and the proposed high-speed download service downloads (records) and watches a broadcast program reserved by a user by a charging method. Hereinafter, recording in the storage means of the broadcast receiving apparatus via broadcast waves is referred to as download. In the high-speed download service, content is distributed according to the scheduling schedule using a dedicated band allocated separately from normal broadcasting. For this reason, the desired content is downloaded at the designated time by reservation of the viewing program. When the user views the content accumulated by downloading, a billing process via the network is required. The authentication server authenticates a user who has been charged for the viewing request and issues a viewing license.

  When a user ID based on user information is used in the digital broadcast receiving apparatus, troublesome registration of user information becomes a problem because the operating environment for data input is not sufficient as compared with an information terminal. In addition, it is difficult to transfer the license when the user views the content with any digital broadcast receiving device in the home. Therefore, user authentication using a storage medium provided in the digital broadcast receiving apparatus can be considered. For example, in the case of a B-CAS card (contact IC card issued by B-CAS), it is distributed in the form of a broadcast receiving device certified by ARIB and B-CAS, and is inserted into the device for use. The A unique ID number and encryption key are stored in the IC chip of the card, and terrestrial / BS digital broadcasting is descrambled using these pieces of information. In the purchase of paid content using the digital broadcast receiving apparatus, user authentication using the ID number of the B-CAS card is possible, so that no new user registration is required. Further, the authentication server can determine from the registration information of the B-CAS card that the device in use is a device in the same home as the purchased broadcast receiving device. The user can easily view the purchased content with any broadcast receiving device in the home. Thus, the billing authentication using the B-CAS card ID facilitates user registration and viewing license sharing at home.

  In the billing authentication process using the B-CAS card, the user selects content that the user wants to purchase and view from the downloaded content. The broadcast receiving apparatus acquires the inserted card ID, transmits the card ID and the content ID to the authentication server, and performs purchase processing. The authentication server registers the card ID and content ID as purchased, and then receives a viewing request (card ID and content ID). If the purchased registration has been made, the authentication server transmits the viewing license to the request source device, and the user can view the content. If the purchased registration has not been made, the authentication server does not transmit the viewing license to the request source device (transmits a purchase error message). The information managed by the billing authentication server is information that associates the downloaded content ID with the purchased B-CAS card ID. The billing authentication server transmits the viewing license to the broadcast receiving apparatus based on the management information.

JP 2002-344930 A JP 2004-252966 A

However, the conventional method has a problem that even users who have not purchased the content can view the content illegally. For example, when a user who owns a B-CAS card that has been purchased and has been registered, passes the card to a third party who is not the purchaser due to loss or lending, and the card is inserted into an arbitrary digital broadcast receiving device. Is mentioned.
Therefore, an object of the present invention is to provide a broadcast receiving apparatus and a control method thereof that prevent unauthorized viewing of content.

  In order to solve the above problems, a broadcast receiving apparatus according to the present invention is a broadcast receiving apparatus that controls a reproduction operation of received content based on user authentication using a removable storage medium, and the storage medium Recognizing means for acquiring the identification information, storage means for storing the received content data, first identification information acquired by the recognizing means when the content is received, and the content stored in the storage means The content is reproduced when the second identification information acquired by the recognizing means is the same when reproducing the content, and when the first identification information and the second identification information are different, Playback control means for prohibiting or limiting playback.

  According to the present invention, unauthorized viewing of content can be prevented in a broadcast receiving apparatus that performs user authentication using a storage medium.

It is a block diagram which shows the structural example of the broadcast receiver which concerns on one Embodiment of this invention. FIG. 2 is a diagram illustrating information held by the content management unit in FIG. 1 in (A), and metadata information of content held in a storage unit is illustrated in (B). It is a flowchart which shows the example of a content download process. It is a flowchart which shows the example of a reproduction | regeneration process of a content.

  FIG. 1 is a block diagram illustrating a configuration example of a digital broadcast receiving apparatus according to an embodiment of the present invention. The digital broadcast receiving apparatus 100 employs a billing authentication system that uses a removable card-type storage medium for user authentication, but the present invention can be applied to an apparatus capable of user authentication using various storage media.

  A signal received by the antenna is input to the tuner unit 101. The tuner unit 101 performs processing such as demodulation and error correction on the input signal, and generates digital data in a format called a transport stream (TS) or TLV (Type Length Value) stream. Here, the TLV stream is a stream composed of variable-length packets assumed in the high-speed download service, and is not a fixed length like TS, so high transmission efficiency is expected. The tuner unit 101 outputs the generated data to the descrambler 102, where descrambling is performed. When the TLV stream or TS data that is scrambled for viewing restriction is input from the tuner unit 101, the descrambler 102 acquires descrambling key information included in the data. The descrambler 102 also acquires key information included in the B-CAS card 115 output from the IC card control unit 110. Data descrambled using the key information is output to a demax (demultiplexer) 103.

  The IC card control unit 110 performs user recognition processing by acquiring identification information stored in an IC card such as a B-CAS card. The IC chip of the card stores user contract information and key information for solving the descrambling key information included in the TLV or TS data. The IC card control unit 110 outputs the key information to the descrambler 102 when the key information for solving the descrambling key information is stored in the IC chip. The descrambler 102 outputs the TLV and TS data as they are to the demux 103 when unscrambled TLV and TS data are input from the tuner unit 101.

  The demax 103 extracts a packet corresponding to the content selected by the user operation. Data in the extracted packet is separated into video data, audio data, data broadcasting data, program guide (EPG) information, and control information. The separated video data and audio data are sent to the decoder 104 and decoded. In the case of download content, that is, content recorded after receiving a broadcast wave, the demax 103 extracts a TLV packet corresponding to the content designated by the user and stores the data in the storage unit 111. The decoder 104 decodes the video data and audio data extracted by the demax 103 and the downloaded content data stored in the storage unit 111 and outputs the decoded data to the display unit 105.

  As the storage unit 111 that stores data of download contents, an internal device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive) is used, or an external storage device can be used. The display unit 105 converts the video data sent from the decoder 104 to perform video display, converts the audio data, and outputs the audio from a speaker (not shown) or the like.

  The communication unit 106 is an interface unit that performs connection processing with an external device such as the authentication server 200 via a network. The communication unit 106 transmits a B-CAS card ID (hereinafter simply referred to as “card ID”) included in the B-CAS card 115 to the billing authentication server on the network at the time of user's viewing request. A viewing license for the downloaded content is received from the server. The viewing license includes license information for permitting authorized users to view the content.

  The content management unit 107 acquires a card ID from the IC card control unit 110. The B-CAS card 115 is inserted into a card slot (not shown) at the start of downloading, and the IC card control unit 110 reads the card ID and transmits it to the content management unit 107. The content management unit 107 manages the card ID by assigning a new content ID. However, when the content distribution company assigns an ID for identifying the content in advance to the download content, the content management unit 107 may use the ID.

FIG. 2A illustrates the content ID managed by the content management unit 107 and the card ID of the B-CAS card inserted when the content is downloaded.
Further, the content management unit 107 assigns the content ID assigned as described above to the metadata information of the content stored in the storage unit 111 and associates it with the card ID. FIG. 2B illustrates the metadata information of the content stored in the storage unit 111. The metadata includes a content name that is a program title of the download content, a content ID that identifies the content, a recording date and time indicating the download date and time, a playback time, program information, and the like.

The control unit 108 controls each unit connected to the bus line, and performs channel selection control, video recording control, and video and audio adjustment control based on user operations. In addition, the control unit 108 interprets a program stored in a memory (not shown) and executes various processes according to a flowchart described later.
A remote controller (hereinafter abbreviated as “remote controller”) 114 is a remote operation device used by a user and includes various operation keys, and is used for various operations such as setting a download reservation for the digital broadcast receiving device 100. The remote control IF (interface) unit 109 includes a light receiving unit that receives, for example, an infrared signal from the remote control 114 and performs photoelectric conversion, and transmits a user operation instruction to the control unit 108.

  When playing back downloaded content, the content playback control unit 112 downloads the card ID managed by the content management unit 107 and the card of the B-CAS card 115 inserted in the digital broadcast receiving apparatus 100 at the time of playback. Compare IDs. If the content reproduction control unit 112 determines that these card IDs are equal, the content reproduction control unit 112 reads and reproduces the content data from the storage unit 111. If the card IDs are different, the content reproduction control unit 112 does not perform reproduction processing or stops reproduction. To control. The reservation management unit 113 manages download content reservation information designated by a user operation using the remote controller 114 or the like. Download reservation information includes broadcast date and time, channel number, program title, and the like.

FIG. 3 is a flowchart illustrating download processing in the digital broadcast receiving apparatus 100, and this processing is realized according to a program executed by the control unit 108.
First, in S10, the control unit 108 determines whether or not a download is necessary based on the download reservation information managed by the reservation management unit 113. If there is a reserved download content, the process proceeds to S11. If it is determined that the download is not necessary, the process of S10 is repeated.

In S11, the IC card control unit 110 acquires the card ID of the B-CAS card 115 inserted in a slot (not shown). In S12, the content management unit 107 newly generates a content ID for identifying the content, and stores it in the storage unit 111 in association with the card ID acquired in S11 (see FIG. 2A).
In S13, the tuner unit 101 receives the download content based on the download reservation information managed by the reservation management unit 113. In S14, the content management unit 107 assigns the content ID generated in S12 to the metadata of the download content (see FIG. 2B), and the storage unit 111 stores these data. In S15, the demax 103 extracts the packet data corresponding to the content selected by the user operation from the received broadcast download data. Here, in the high-speed download service, TLV de-max processing is performed to improve transmission efficiency due to variable packet length. In S16, the download content is stored in the storage unit 111 in association with the content ID generated by the content management unit 107 in S12, and the association process with the B-CAS card 115 is completed.

FIG. 4 is a flowchart illustrating download content reproduction control processing in the digital broadcast receiving apparatus 100, and this processing is realized according to a program executed by the control unit 108.
In S <b> 20, the IC card control unit 110 acquires the card ID of the B-CAS card 115 inserted in the digital broadcast receiving apparatus 100. In step S21, the communication unit 106 accesses the download content authentication server 200 via the network. The communication unit 106 transmits the card ID acquired in S20 and the content ID to be viewed to the authentication server 200, and requests acquisition of a license necessary for viewing. In step S <b> 22, the control unit 108 determines whether a viewing license has been acquired through the communication unit 106. If the viewing license cannot be acquired, the content indicated by the content ID is an unpurchased content, and the process ends.

  If the viewing license is acquired in S22, the process proceeds to S23. Here, the content reproduction control unit 112 acquires a card ID at the time of downloading. This card ID is managed by the content management unit 107, and can be acquired by referring to the content ID stored in the storage unit 111 as metadata in association with the download content. In S24, the content reproduction control unit 112 compares the card ID acquired in S23 with the card ID of the B-CAS card 115 currently inserted in the apparatus, and determines whether or not they are the same. To do. When it is determined that the card IDs are not the same, the content reproduction control unit 112 ends the process without reproducing the downloaded content. If it is determined that the card IDs are the same, the process proceeds to S25, and the descrambler 102 performs descrambling using data based on the license information acquired from the authentication server 200. In S26, the decoder 104 decodes the video and audio of the content, and in S27, the display unit 105 reproduces the download content including the decoded video and audio.

  As described above, the content management unit 107 stores the card ID (first identification information) of the B-CAS card inserted at the time of downloading in association with the content identification information. The content playback control unit 112 compares the card ID (second identification information) of the B-CAS card inserted during playback with the card ID of the B-CAS card inserted during download. When the card IDs are the same at the time of downloading and at the time of reproduction, the reproduction of the content for which the viewing license has been received is permitted, and when they are different, the reproduction operation is prohibited or restricted. In this embodiment, when the card ID is different between the recording time and the reproducing time, the reproduction of the content is substantially prohibited by not releasing the scramble process. The restriction of the reproduction operation includes partial data reproduction, display processing of warning messages, etc., and processing for preventing unauthorized viewing (recording of usage history, notification, etc.).

As described above, according to the present embodiment, the downloaded content and the card identification information are associated with each other so that the downloaded content cannot be played back when the card identification information inserted differs between the download time and the playback time. Control. This makes it possible to prevent unauthorized viewing on a plurality of broadcast receiving devices by carrying the B-CAS card, and a third party who owns the B-CAS card cannot view unpurchased content.
In this embodiment, the content ID and the card ID at the time of download are managed separately from the metadata. However, the content ID and the card ID information at the time of download may be included in the metadata of the downloaded content.

DESCRIPTION OF SYMBOLS 100 Broadcast receiving apparatus 106 Communication part 107 Content management part 110 IC card control part 111 Storage part 112 Content reproduction control part 115 B-CAS card 200 Authentication server

Claims (4)

A broadcast receiving device that controls a reproduction operation of received content based on user authentication using a removable storage medium,
Recognition means for acquiring identification information of the storage medium;
Storage means for storing received content data;
When the first identification information acquired by the recognition unit when receiving the content is equal to the second identification information acquired by the recognition unit when reproducing the content stored in the storage unit A broadcast receiving apparatus comprising: a reproduction control unit that reproduces content, and prohibits or restricts reproduction of the content when the first identification information and the second identification information are different from each other . Content management means for managing the first identification information in association with the content identification information;
The reproduction control means, when reproducing the content stored in the storage means, the first identification information managed by the content management means in association with the identification information of the content, and the second identification information The broadcast receiving apparatus according to claim 1, wherein it is determined whether or not the identification information is equal. A communication means for performing a connection process with the authentication server via the network;
When the communication means transmits the content identification information and the first identification information to the authentication server and receives license information for permitting viewing of the content from the authentication server, the reproduction control means The broadcast receiving apparatus according to claim 2, wherein it is determined whether or not the first identification information and the second identification information are equal. A control method executed by a broadcast receiving device that controls a reproduction operation of received content based on user authentication using a removable storage medium,
A recognition step of obtaining first identification information relating to the storage medium when the content is received;
An accumulation step for storing the data of the received content;
A recognition step of acquiring second identification information relating to the storage medium when reproducing the content stored in the accumulation step;
A determination step of determining whether or not the first identification information and the second identification information are equal;
When the determination step determines that the first identification information and the second identification information are equal, the content is reproduced, and the first identification information and the second identification information are different. A broadcast receiving apparatus control method comprising: a reproduction control step for prohibiting or restricting reproduction of the content when it is determined to be.

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