JP2011109192A - Content distribution method using digital broadcast - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely distribute a content intended to be limitedly distributed using broadcast waves or to be used by a limited user when the content is distributed, in temporary digital broadcast such as event-responsive One seg broadcast. <P>SOLUTION: When a decryption key of a content, that is, data required for utilization of the content is requested from mobile phones 2-4 being receivers, and when whether the mobile phones 2-4 have authority is determined based on whether it has been registered in a customer DB 5, whether information showing that a content of a broadcast station 1 can be used is registered in the mobile phones 2-4 is confirmed; when not registered, a primary registration database in the customer DB 5 is confirmed about the mobile phones 2-4 having justifiable authority in the session; and, when not registered in the primary registration database, a main database in the customer DB 5 is confirmed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technology for distributing content using digital broadcasting. In particular, it relates to content distribution for a specific area (area) using so-called one-segment broadcasting. The contents here are contents that can be used by a predetermined user, such as data broadcasting data and file formats, regardless of the format, such as a privilege for the user.

  Currently, digital broadcasting such as terrestrial digital broadcasting is widespread. In digital broadcasting, information is handled digitally as its name suggests, so it is possible to distribute contents other than broadcasting. In particular, in so-called one-segment broadcasting for mobile terminals (telephones), the receiver (mobile terminal) is excellent in portability. Therefore, it is suitable for distributing contents corresponding to the event at an event.

  In the case of such content distribution, it becomes a problem to prevent distribution to an unauthorized user. In order to solve this problem, Patent Document 1 is proposed. In Patent Document 1, an identifier is assigned to distribution data, and the receiver side has a filter that reproduces based on the assigned identifier, and based on this, only authorized distribution data is reproduced.

JP 2002-152893 A

  In Patent Document 1, identification data is received for each distribution data (content) and used for whether or not it can be reproduced, but the identification data is easy to forge, etc. The possibility that it can be used will increase.

  Therefore, in the present invention, the determination of the availability of content is made using an encryption key. It is an object of the present invention to use such an encryption key. For this issue, when using an encryption key, it is necessary to check the validity (authority) of the receiver side, and how to receive a decryption key that decrypts content encrypted with the encryption key. It also includes sending to the machine side.

  In order to solve the above problems, in the present invention, when a decryption key of content, that is, data necessary for using the content is requested from the receiver, is the receiver (or its user) authorized? Is determined whether it is registered in the database, it is confirmed whether information indicating that the contents of this broadcasting station can be used is registered in the receiver. Check the primary registration database registered for receivers (users) with proper authority, and check this database if it is not registered in the primary registration database. In many cases, the content to be distributed is unique to an event or the like, and it has been made in view of obtaining (registering) authority each time.

  Also, in the present invention, when it is determined that the user has authority, the decryption key for decrypting the content is encrypted with the session key and transmitted to the receiver, and the receiver decrypts the content with the session key. It is also included.

  According to the present invention, content distribution using an encryption key can be performed more safely.

It is a system configuration diagram in one embodiment of the present invention. It is a table | surface explaining the data transmission using the vacant area of a broadcast wave. It is a flowchart (the 1) explaining the process in one Embodiment of this invention. It is a flowchart (the 2) explaining the process in one Embodiment of this invention. It is a flowchart explaining the user registration process in one Embodiment of this invention. It is a table | surface explaining the item example of the transmission content in a broadcast wave. It is a table | surface explaining the example of an item of a distributor registration list. It is a table | surface explaining the example of an item of primary registration DB. It is a table | surface explaining the example of an item of this registration DB.

  Hereinafter, an embodiment of the invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram of the present invention. In the present embodiment, the broadcasting station 1 is composed of mobile phones 2 to 4 as an example of a broadcast receiver and a customer DB 5. Here, the broadcasting station has a function for transmitting an area-limited one-segment broadcast wave, a function for transmitting data using a vacant area of the broadcast wave, a function for performing network communication, and encrypting information using a key. It has a function of decoding and a function of registering mobile phone information in the customer DB. The cellular phones 2 to 4 have a function of receiving broadcast waves, a function of receiving data transmitted using a vacant area of the broadcast waves, a function of performing network communication, and a function of encrypting information using a key. And a function for generating a session key, a function for decrypting information using the session key, and a function for decrypting protected content using the decryption key. The customer DB 5 has a primary registration DB and a main registration DB, and has a function of moving information in the primary registration DB to the main registration DB every 24 hours. The broadcasting station 1 is realized by a so-called computer, and each function is executed by an arithmetic device such as a CPU according to a program. Further, the customer DB 5 may be included in the configuration of the broadcast station 1, or may be configured to be connected to the broadcast station 1 through a network or the like.

  FIG. 2 is a schematic diagram of data transmission using a vacant area of a broadcast wave. Within the frequency band for digital terrestrial broadcasting, area-limited one-segment broadcasting and data transmission are performed using one of the 13 segments in the band not used for actual terrestrial broadcasting.

  FIG. 3 and FIG. 4 are flowcharts describing content distribution processing using an area-limited one-segment broadcasting free area in the present embodiment. The broadcast station 1 transmits an advertisement program (advertisement 1) by an area-limited one-segment broadcast wave, and uses a vacant area of the broadcast wave so that the distributor ID (AA01), the protected content (SP1), and the broadcast station 1 The public key (123456), the user registration site address (www.aa.co.jp), and the request destination address (www.xx.co.jp) of the decryption key of the protected content are transmitted (S11).

  As shown in FIG. 6, the item examples of the transmission contents on the broadcast wave in S11 are the advertising program, distributor ID, protected content, public key, user registration site address, and decryption key request destination address. An advertising program is a program that can be viewed (utilized for reproduction or the like) without restriction if it is a mobile phone having a function of receiving broadcasts. The distributor ID is an ID that uniquely determines a distributor (or distribution apparatus or broadcasting station). Protected content is content that cannot be viewed without decryption using the decryption key for protected content. When certain conditions such as user registration are satisfied, the decryption key for protected content can be obtained. Become. The public key of the broadcasting station 1 is for encrypting communication between the mobile phone and the broadcasting station 1, and since the broadcasting station 1 has a corresponding secret key, the public key of the broadcasting station 1 is used. The encrypted data can be decrypted by the broadcasting station 1. The address of the user registration site is an address of a site accessed when performing user registration from a mobile phone. The request destination address for the decryption key of the protected content is an address of a site that is accessed when requesting a decryption key for viewing the protected content.

  The mobile phones 2 to 4 receive the broadcast wave, display the advertisement program (advertisement 1) on the screen, and display the “view protected content (SP1)” button on the screen (S12). When the viewer desires to view the received protected content (SP1), the viewer views the protected content (SP1) by pressing the “view protected content (SP1)” button displayed on the screen. A desired input is received (S13). When the input is accepted, the mobile terminals 2 to 4 search the distributor ID (AA01) of the protected content (SP1) desired to be viewed from the distributor registration list (S14). That is, when the user (mobile phone or user) has already been authorized to use the content (of the broadcast station 1) (registered in the database of the broadcast station), the record is stored in the mobile phone (distributor registration list) This is used, and this is used to make the determination in S14. For this reason, in this embodiment, when it is confirmed that it is registered in the main registration DB in S19 described later and a decryption key is received in S24, registration in the list is performed. The reason for this kind of processing is that if the broadcast is temporary, such as for an event, multiple contents are often delivered (obtained) sequentially during the event or session, and when the contents are delivered earlier, If it is registered in the primary registration DB, the efficiency of confirmation can be improved. For this reason, in S24, not the distributor ID (or in addition), the decryption key itself received in S24, or the presence / absence of reception thereof, is registered in the distributor list, and the determination in S14 is performed using this. Also good. The significance of these efficiency improvements is the same in the confirmation processing in S19 described later. Further, when it is determined in S19 that it is not registered in the main registration DB, individual authentication processing may be executed to perform registration work.

  However, this registration may be performed when authentication processing by another session is performed, or may be registered manually without using the session.

  If it is not in the distributor registration list, the registration site is accessed (S26), and if there is, a session key is generated (S15).

  The item examples of the distributor registration list in S14 are configured with a distributor ID as shown in FIG. The distributor ID is an ID that uniquely determines a distributor.

  FIG. 5 shows a flowchart of user registration processing in the present embodiment. When the distributor ID (AA01) of the protected content (SP1) that the user wishes to view is not in the registration list, the mobile phones 2 to 4 are broadcasted by the received user registration site address (www.aa.co.jp). 1 is accessed (S26), encrypted with the public key (123456) of the broadcasting station 1 (S27) and transmitted with the customer name (tatata) and the terminal IDs (01002300424) of the mobile phones 2-4. (S28). The broadcasting station 1 decrypts the received customer name (song) and the terminal ID (01002300424) of the mobile phones 2 to 4 (S29), and uniquely identifies the customer ID (10000121) and the decrypted customer name (10000121). The terminal ID (01002300424) of the mobile phones 2 to 4 and the current date (20090707) are registered in the primary registration DB (S30). The mobile phones 2 to 4 add the distributor ID (AA01) to the distributor registration list (S31).

  Examples of items in the primary registration DB in S30 are a customer ID, a terminal ID, a customer name, and a registration date, as shown in FIG. The customer ID is an ID by which a broadcasting station uniquely determines a customer registered as a user. The terminal ID is an ID that uniquely determines a mobile phone, is an ID determined for each mobile phone, and is stored in the mobile phone itself. The customer name is information transmitted by the mobile phones 2 to 4 at the time of user registration. The registration date is the date when the user was registered in the primary registration DB. A user ID for identifying the user may be used instead of the terminal ID. In this case, an input received from the user or one stored in advance by the mobile phone is used.

  The mobile phones 2 to 4 generate a session key (987654) used for exchange of the decryption key of the protected content (S15). The generated session key (987654), the terminal IDs (01002300424) of the mobile phones 2 to 4 and the ID (SP0001) of the protected content requesting the decryption key are encrypted with the public key of the broadcasting station 1 (S16). The decryption key request destination address (www.xx.co.jp) is designated and transmitted to the broadcasting station 1 (S17).

  The broadcast station 1 decrypts the received session key (987654), the terminal IDs (01002300424) of the mobile phones 2 to 4 and the ID (SP0001) of the protected content requesting the decryption key with the private key of the broadcast station 1 (S18). ). If the terminal ID (01002300424) received from the mobile phones 2 to 4 is in the primary registration DB, the main registration DB is searched (S19). As described above, the primary registration DB is registered at S24 in the present embodiment. This is registered at the time of the previous content distribution request such as the first. The contents registered in the primary registration DB are registered in the main registration DB by batch processing after the end of the event or at night. In this case, it is preferable to move the contents of the primary registration DB.

  Further, when it is determined in S19 that it is registered in the main registration DB, the contents of the main registration DB may be copied to the primary registration DB. This makes it possible to make an immediate determination when the next request is made.

  If it is not in the main registration DB, an alarm (information for outputting) that warns that it is not registered is transmitted to the mobile phones 2 to 4 (S20). The mobile phones 2 to 4 receive the alarm and display it on the screen (S21). In response to this, authentication or the like may be performed, and registration in the temporary registration DB or list may be performed.

  The example items of the main registration DB in S19 are the same items as the primary registration DB as shown in FIG.

  When the terminal IDs (01002300424) of the mobile phones 2 to 4 are in the primary registration DB or the main registration DB, the broadcasting station 1 decrypts the decryption key (abcdef) corresponding to the requested protected content (SP1) in S18. The session key (987654) is encrypted (S22) and transmitted to the mobile phones 2 to 4 (S23).

  The cellular phones 2 to 4 use the session key (987654) to decrypt the decryption key (abcdef) of the protected content (S24). The protected content (SP1) is decrypted using the decrypted decryption key (abcdef) and output to the screen (S25).

  In this embodiment, the broadcast wave broadcast and the exchange of each encrypted information are executed by one broadcast station, but may be realized by another device.

  1 ... broadcast station, 2-4 ... mobile phone, 5 ... customer DB

Claims (4)

In a content distribution method using digital broadcasting that distributes encrypted protected content from a broadcasting station device to a receiver using a digital broadcast wave,
Broadcast the broadcast wave including the protected content and the public key of the broadcast station device from the broadcast station device to the receiver;
The receiver is
When an input to the effect that the user wishes to use the protected content is received from the user of the receiver, information indicating whether or not the content of the broadcasting station apparatus can be used is registered in the distributor registration list. Determine whether
If not registered, generate a session key used in a session with the broadcast station device,
The session key, a receiver ID for identifying the receiver and a protected content ID for identifying the protected content are encrypted with the public key, and transmitted to the broadcasting station.
The broadcasting station device
Decrypting the encrypted information transmitted from the receiver;
The decrypted receiver ID indicates whether the protected content can be used, and determines whether the decrypted receiver ID is stored in the primary registration DB that is registered in the session between the broadcast station apparatus and the receiver,
If it is not stored, determine whether it is stored in the main registration DB,
When the receiver ID is stored in either the primary registration DB or the main registration DB, the decryption key of the protected content is encrypted with the session key and transmitted to the receiver.
The receiver is
Decrypting the decryption key of the protected content with the session key generated by the receiver;
A content distribution method using digital broadcasting, wherein the protected content is decrypted with a decryption key of the decrypted protected content. The content distribution method using digital broadcasting according to claim 1,
When the broadcast station apparatus determines that the reception ID is stored in the main registration DB, the broadcast station apparatus records the contents registered in the main registration DB in the primary registration DB. Content delivery method used. In the content delivery method using the digital broadcast according to claim 1 or 2,
When the receiver receives the protected content from the broadcast station device, the receiver registers information indicating whether the content of the broadcast station device can be used in the distributor registration list. Content delivery method used. In the content delivery method using the digital broadcast in any one of Claims 1 thru | or 3,
The content distribution method using digital broadcasting using digital broadcasting, wherein the digital broadcasting is one-segment broadcasting and the receiver is a mobile phone.

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