JP2007060496A - Program content reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a program content reproducing device capable of judging relevance between subcontent and a program and properly informing a viewer of existence of the subcontent. <P>SOLUTION: The program content reproducing device 113 acquires the program content and authentication information transmitted from a broadcasting station 111 in a broadcast receiving part 101. In addition, subcontent data transmitted from a server 112 is acquired in a communication part 103. The program content is reproduced and displayed in a program content reproduction part 102. The subcontent data are stored in a subcontent data storage part 104 and authenticated in a subcontent data authentication part 105 based on the authentication information. Then, when the subcontent data are authenticated, their existence is represented on the reproduced program content by a subcontent data existence display part 106. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a program content reproduction apparatus, and more particularly to a program content reproduction apparatus that can indicate to viewers the presence of sub-contents related to a program during a program broadcast.

  Currently, in terrestrial digital broadcasting, satellite digital broadcasting, and the like, the latest news, weather forecasts, information on programs being broadcast (program related information), and the like are provided using data broadcasting. In data broadcasting technology, characters, images, layouts, and the like of program-related information displayed on a screen are defined by a language called BML (Broadcast Markup Language). By using data broadcasting technology, viewers can not only watch programs but also broadcast to broadcast programs and broadcasting stations, participate in quiz programs, and introduce in shopping programs You can purchase products that have been sold. Such program-related information is also provided by an EPG (Electronic Program Guide), and viewers can obtain information on the performers and stories of the program by designating the program on the displayed EPG. be able to.

  Such program-related information is not only included in data broadcasting, but also provided on the Internet via a communication line. In Patent Document 1 below, a receiving terminal is proposed for the purpose of combining broadcasting and communication so that a user can receive a wider variety of services. This receiving terminal receives link destination information such as URL (Uniform Resource Locator) on the Internet as program related information included in the data broadcast, and the program related information is displayed at the link destination in the display column of the corresponding program on the EPG. A specific mark such as an icon indicating the presence is displayed. By selecting this icon, the user can acquire program-related information existing on the Internet.

  At that time, the user follows the hyperlink described in the program-related information, and is connected to a server that provides information that is not program-related information without being aware of it, and the program-related information is provided. There is a problem that the information may be browsed with the assumption.

  As a method of solving this problem, the following Patent Document 2 transmits a list of server addresses used for program-related services to a terminal for each time period, and whether the service used for the user is program-related. A broadcast receiver that indicates whether or not is proposed. Patent Document 3 discloses a method for authenticating a server using a broadcast wave, by transmitting a public key for authenticating a WEB server certificate via a broadcast wave, thereby eliminating the need to operate a certificate authority and reducing management costs. A broadcast receiving system is proposed.

  By the way, the following Patent Document 4 uses a template and can easily create multimedia contents using various functions such as a camera, a microphone, and an address book that are inherent to the terminal. Has proposed a multimedia data processing apparatus. In such a multimedia data processing apparatus, various functions are sequentially called in time series by a script described in a template, so that a user can create multimedia contents only by operating according to a user interface at a predetermined timing. Can do.

With the spread of mobile phones with built-in tuner that can watch TV programs, it will become familiar to users to watch various digital broadcasts using mobile phones in the future. Along with this, services provided by data broadcasting need to consider viewing on mobile phones as well as televisions in the home. For example, by providing the above-mentioned template by data broadcasting instead of program-related information defined by BML, the user can easily obtain data necessary for using the service from functions unique to mobile phones such as cameras, microphones, and address books. To be able to get to.
Japanese Patent Laying-Open No. 2005-26867 JP 2003-209542 A JP 2002-344407 A JP 2004-343683 A

  However, when the above-mentioned template is acquired from other communication means represented by the Internet instead of data broadcasting, there is a problem that it is not known which template provides which program-related service. Arise.

  The broadcast receiver described in Patent Document 2 determines the relevance based on the address of the server, not the content of the template itself. Therefore, when the method is applied to the multimedia data processing device described in Patent Document 4 as it is, the connection with the server cannot be determined unless the multimedia data processing device that interprets the template is connected to the server. There is a problem.

  In addition, when the broadcast receiving system described in Patent Document 3 is applied to the multimedia data processing device described in Patent Document 4, it is guaranteed that the server is authenticated by the certificate authority, There is a problem that the relevance to the program cannot be judged.

  The present invention has been made in view of the above problems, and judges the relevance between a sub-content such as a template stored in a terminal and a program and appropriately notifies the viewer of the existence of the sub-content. An object of the present invention is to provide a program content reproducing apparatus capable of performing the above.

  In order to achieve the above object, according to one aspect of the present invention, a program content reproduction apparatus includes a broadcast receiving unit that acquires program content and authentication information, a program content reproduction unit that reproduces program content, and sub-content data. Sub-content data storage means for storing the sub-content data stored in the sub-content data storage means based on the authentication information, and a program based on the authentication result of the sub-content data authentication means Sub-content data presence presentation means for presenting the presence of sub-content data during reproduction of program content in the content reproduction means.

  Further, it is preferable that the sub content data presence presenting means presents only the presence of the sub content data authenticated by the sub content data authenticating means.

  Alternatively, the sub-content data presence presenting means preferably presents the sub-content data authenticated by the sub-content data authenticating means and the non-authenticated sub-content data in different forms.

  Furthermore, the authentication information is a public key, and the sub-content data is attached with an electronic signature using a secret key that is paired with the public key. The sub-content data authenticating means confirms the validity of the electronic signature using the public key. Thus, it is preferable to authenticate the sub content data.

  Further, the program content reproducing apparatus includes a sub content data selecting unit that selects the sub content data whose presence is presented by the sub content data existence presenting unit, and a sub content that reproduces the sub content data selected by the sub content data selecting unit. It is preferable to further comprise data reproducing means.

  Furthermore, it is preferable to include a message creation unit that creates a formatted message by information included in the sub-content data and an input from the user, and a message transmission unit that sends the message created by the message creation unit. .

  In addition, the program content reproduction device preferably further includes an acquisition unit that acquires the sub-content data from another device, and preferably uses a communication unit different from the broadcast reception unit and the acquisition unit.

  According to another aspect of the present invention, a program content reproduction apparatus includes a broadcast receiving unit that acquires program content and authentication information, a program content reproduction unit that reproduces program content, and a sub-content data storage that stores sub-content data. Means, sub-content data authenticating means for authenticating the sub-content data stored in the sub-content data storing means based on the authentication information, and sub-content data reproducing means for reproducing the sub-content data authenticated by the sub-content data authenticating means With.

  Further, the sub-content data has a priority, and the sub-content data reproducing means can reproduce the sub-content data having the highest priority when there are a plurality of sub-content data authenticated by the sub-content data authenticating means. preferable.

  With the above configuration, the program content reproduction apparatus according to an aspect of the present invention authenticates sub-content data such as a template stored in the terminal using authentication information included in the broadcast wave, and is only broadcasting the authenticated sub-content. It is assumed that the information is related to the program.

  Therefore, the presence of sub-content data related to a program among the sub-content data acquired by communication means other than broadcasting can be presented to the viewer during the broadcasting of the program.

  In addition, the program content reproduction apparatus according to an aspect of the present invention displays a list of only sub-content data related to a program among the sub-contents acquired by communication means other than the broadcast while the program is being broadcast. Can do.

  Alternatively, the program content reproduction apparatus according to an aspect of the present invention changes a display form of a list of sub-content data not related to the sub-content related to the program among the sub-content data acquired by communication means other than broadcasting. Can be displayed during the broadcast of the program.

  Further, the program content reproduction apparatus according to an aspect of the present invention can reproduce the sub content data selected by the user based on the displayed list.

  In addition, the program content reproducing apparatus according to an aspect of the present invention can reproduce sub-contents related to a program among sub-content data acquired by communication means other than broadcasting at a time intended by the broadcasting station.

  Also, the program content reproduction apparatus according to an aspect of the present invention can create and transmit a message based on information included in the sub content data and an input from the user.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same.

  In the present embodiment, the program content reproduction apparatus according to the present invention is preferably realized in a mobile phone having a television broadcast receiving function and an Internet communication function.

  FIG. 15 is a diagram showing a specific example of the hardware configuration of the program content reproduction apparatus 113 according to the present embodiment, which is a mobile phone.

  Referring to FIG. 15, program content playback apparatus 113 according to the present embodiment, which is a mobile phone, includes an input / output unit 140 that is an interface with a user, a CPU (Central Processing Unit), and the like. The control unit 120 includes a control unit 120 that controls the entire program content reproduction device 113, a communication unit 150 that communicates with other devices, a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. And a storage unit 130 that stores intermediate data of the program, data received from other computers, and the like.

  Further, the input / output unit 140 includes a key code input device 142 including numeric keys such as “1” and “2” and direction keys such as “R” and “L”, and an LCD (Liquid) for displaying information to the user. A display 144 such as a crystal display), a microphone 146 that inputs sound, a speaker 148 that outputs sound, and a camera 149 that captures and inputs an image.

The control unit 120 includes a timer therein.
Such processing in the program content reproduction device 113 is realized by hardware of the program content reproduction device 113 and software stored in the storage unit 130 and executed by the control unit 120. Note that the operation of the program content reproduction apparatus 113 shown in FIG. 15 as a mobile phone is well known.

  The program content reproduction apparatus 113 according to the present embodiment receives program content from the broadcast station 111 through broadcast waves, and can communicate with the server 112 via a network such as the Internet.

  From the server 112, for example, a blog browsing service for browsing blogs (blogs, Weblogs; generic names of diary websites updated daily), a blog posting service for posting blogs, authors and publishers of books (books), Book information providing service for providing book information such as price, price comparison service for comparing product prices, product purchasing service for purchasing products (eg, books, DVD (Digital Video Disk), CD (Compact Disk), etc.), programs Services such as an online storage service for accumulating image data and photo data transmitted from the content reproduction apparatus, and a voting service for answering (voting) a questionnaire or the like from a service using terminal are provided. Of course, these services are merely examples of services provided by the server 112, and various other services can be considered.

  Further, there may be one or a plurality of servers that can communicate with the program content reproduction apparatus 113, and one or a plurality of services may be provided by one server.

[First Embodiment]
FIG. 1 is a block diagram illustrating a specific example of a functional configuration of the program content reproduction apparatus 113 according to the first embodiment. Each function shown in FIG. 1 is realized in the program content reproduction apparatus 113 by the control unit 120 reading and executing a program stored in the storage unit 130 and controlling each unit shown in FIG.

  Referring to FIG. 1, a program content reproduction apparatus 113 according to the first embodiment includes a broadcast receiving unit 101, a communication unit 103, a data transmitting unit 110, and a storage unit 130 that are configured by a communication unit 150. Formed in the control unit 120 by executing a program in the sub-content data storage unit 104, which is a predetermined area, the sub-content data selection unit 107 and the user input unit 114 including the input / output unit 140 and the like. The program content playback unit 102, the sub content data authentication unit 105, the sub content data presence display unit 106, the sub content data playback unit 108, and the data creation unit 109, which are functions to be performed.

  The broadcast receiving unit 101 receives a broadcast wave including program content transmitted from a broadcasting station and authentication information related to the program content, and receives the program content in the program content reproduction unit 102 and the authentication information in the sub content data authentication unit 105. To enter. The authentication information is transmitted as a data broadcast in digital broadcast, for example. The authentication information is preferably a public key, details of which will be described later.

  The communication unit 103 performs communication with the server 112 via the Internet or a dedicated line, wireless communication, and the like, and receives data including sub-content data from the server 112. The sub content data is preferably a template, and details of the sub content data will be described later. The sub content data received by the communication unit 103 is stored in the sub content data storage unit 104.

  The sub-content data authentication unit 105 reads the sub-content data from the sub-content data storage unit 104 and authenticates the sub-content data based on the authentication information input from the broadcast receiving unit 101. Then, the authentication result is input to the sub-content existence display unit 106.

  Based on the authentication result input from the sub-content authentication unit 105, the sub-content presence display unit 106 generates display data for displaying a list of sub-content data indicating the presence of sub-content, and a program content reproduction unit 102. The program content reproduction unit 102 reproduces the program content input from the broadcast receiving unit 101 and displays a list of sub content data on the program content based on the display data input from the sub content presence display unit 106. indicate.

  Specifically, the sub content data selection unit 107 is configured by combining an up / down key, a numeric keypad, and the like with an enter key. The viewer changes the selection candidate of the desired sub-content data on the list of sub-content data displayed on the program content with the up / down key and the numeric keypad, and the selection candidate changed with the determination key is finally determined. Perform instruction operation. Sub-content data selection unit 107 receives an instruction operation from the viewer, and inputs the selection result to sub-content data reproduction unit 108 and data creation unit 109.

  The sub-content data reproduction unit 108 acquires necessary content data from the sub-content data storage unit 104 based on the selection result input from the sub-content data selection unit 107 and reproduces it. The user input unit 114 receives an input from the user accompanying the reproduction of the sub content data, and passes the input signal to the data creation unit 109.

  The data creation unit 109 creates transmission data that is a formatted message based on the selection result input from the sub-content data selection unit 107 and the user operation input from the user input unit 114, and transmits the data. To the unit 110. The data transmission unit 110 transmits transmission data from the communication unit 103 to the server 112.

  FIG. 2 is a flowchart showing a specific example of processing in the program content reproduction apparatus 113 according to the first embodiment. The processing shown in the flowchart of FIG. 2 is realized by causing the control unit 120 to read and execute a program stored in the storage unit 130 and to exhibit each function shown in FIG. 4 to 7 are diagrams showing specific examples of screen display when program content is played back by the program content playback device 113. FIG.

  Referring to FIG. 2, first, when program content is received from broadcast station 111 at broadcast receiving unit 101 and authentication information is received from server 112 at communication unit 103 (step S201), program content reproducing unit 102 receives a program content. The content is played back (step S202).

  FIG. 4 is a diagram showing a specific example of the program content played back in step S202. Here, specifically, it is assumed that a program that provides information on a book that is recently popular is played back. .

  The communication unit 103 receives the sub content data transmitted from the server 112 (step S203) and stores it in the sub content data storage unit 104 (step S204). Note that the reception of the sub content data in step S203 is not executed after the reception in step S201 and the reproduction in step S202, but may be executed at other timing.

  Next, the sub-content data stored in the sub-content data storage unit 104 is stored in the sub-content data authentication unit 105 based on the authentication information related to the program content received in step S201 and reproduced in step S202. Authentication is performed (step S205). The authentication process in step S205 will be described later.

  As a result of the processing in step S205, if there is no authenticated sub content data in the sub content data storage unit 104 (NO in step S205), the processing returns to step S201.

  On the other hand, as a result of the processing in step S205, if the authenticated sub-content data is in the sub-content data storage unit 104 (YES in step S205), the presence of the sub-content data authenticated in step S205 indicates that the program content reproducing unit It is presented on the program content reproduced at 102 (step S206).

  FIG. 5 is a diagram showing a first specific example of the method for presenting the presence of sub-content data in step S206.

  As a first method, the sub-content data existence display unit 106 generates display data for displaying a list indicating only authenticated sub-content data. With reference to FIG. 5, such a list is displayed over the program content reproduced by the program content reproduction unit 102, and the authenticated sub-content data is presented to the viewer.

  FIG. 6 is a diagram showing a second specific example of the method for presenting the presence of sub-content data in step S206.

  As a second method, the sub-content data presence display unit 106 is all sub-content data stored in the sub-content data storage unit 104, and is authenticated with the display form of the authenticated sub-content data. Display data for displaying a list showing different display forms of the sub-content data is generated. With reference to FIG. 6, such a list is displayed over the program content reproduced by the program content reproduction unit 102, and the authenticated sub-content data is presented to the viewer. As a specific difference in display form, as shown in FIG. 6, a star shape is added to the vicinity of the character string of the list indicating the sub-content data only to the authenticated sub-content data, and the sub-content is not authenticated. There is a difference in display form such that the display of the character string of the list indicating the data is made smaller than the character string of the list indicating the authenticated sub-content data. By changing the display form in this way, a list of all the sub-content data stored in the sub-content data storage unit 104 is displayed and which sub-content is authenticated by the program to the viewer. Can be easily informed.

  Note that the method of presenting the presence of sub-content data is not limited to the specific examples shown in FIGS. 5 and 6, which sub-content data is authenticated and which sub-content data is authenticated. Any method may be used as long as it is a display that can be understood by the viewer.

  Further, the method of presenting the presence of sub-content data is not limited to display, and may be performed by other output methods such as audio output. For example, when the output method is audio output, in order for the viewer to know which sub-content data has been authenticated and which sub-content data has not been authenticated, it is authenticated with the authenticated sub-content data. It is preferable to present it in different output forms, such as outputting different sub-content data at a different volume or outputting in a different sound range.

  Next, when the sub-content data selection unit 107 accepts selection of desired sub-content data from the viewer based on the display indicating the presence of the sub-content data presented on the program content in step S206 (step S207). YES), the sub-content data reproducing unit 108 acquires the sub-content data selected from the sub-content data storage unit 104 and reproduces it (step S208). The process in step S208 will be described later.

  FIG. 7 is a diagram showing a specific example of the sub-content data selection method in step S207. In FIG. 7, when the character string “BEST100!” Indicating one subcontent data is focused, it is indicated that the subcontent is a selection candidate. The focus applied to the character string indicating the sub content data can be changed with the up and down keys constituting the sub content data selection unit 107, and after the change, the determination key constituting the sub content data selection unit 107 is pressed. Thus, the changed sub-content data is selected as sub-content data to be reproduced. When the state determination key shown in FIG. 7 is pressed, the sub-content data indicated by the character string “BEST100!” Is selected as the sub-content data to be reproduced.

  FIG. 3 is a specific example of the sub content data according to the first embodiment, and “recommended purchase” is displayed among the displays indicating the presence of the sub content data shown in FIGS. 5 and 6. It is a figure which shows the specific example of the detail of sub content data. This sub-content data is for reproducing sub-contents used when a viewer purchases a book recommended by a program.

  Referring to FIG. 3, sub-content data includes display information “title.xml” that defines a character string indicating sub-content data in a list of sub-content data indicating that sub-content data exists, and the sub-content data. User input auxiliary information “ui1.xml”, “ui2.xml” for assisting user input accompanying data reproduction, and transmission data information “data1.xml”, “data2.xml” for creating transmission data ..., Transmission destination information “send.xml”, which is information relating to the transmission destination of transmission data, and signature information “signature.xml” describing an electronic signature added to the sub-content data. .

  FIG. 8 is a diagram showing a specific example of screen display when sub-content data is reproduced in the sub-content data reproducing unit 108 in step S208. FIG. 8 shows a specific example of the screen display when the sub content data shown in FIG. 3 is reproduced.

  When the reproduction of the sub-content data is started in step S208, the content of the user input auxiliary information “ui1.xml” is displayed first as shown in FIG. 8A. Here, to enter the name (list) of each recommended book, a check box for selecting a book to be purchased (displayed next to each recommended book), and an instruction to move to the next display screen "Next" link is displayed.

  The viewer using the service selects a book to purchase based on the display screen of FIG. 8A (checks a check box displayed next to the book to be purchased), and instructs to move to the next display screen When “Next” is selected at the lower right of the display screen, the contents of the user input auxiliary information “ui2.xml” are displayed as shown in FIG. 8B.

  In the screen based on the user input auxiliary information “ui2.xml” shown in FIG. 8B, an input column for the postal code and address of the delivery destination of the product and an instruction to move to the next display screen are input. The “Next” link is displayed. As shown in FIG. 3, in the user input auxiliary information “ui2.xml”, a description for storing the input zip code and address, and when the zip code and address are already stored, Is included as a default display (type = kioku).

  Then, when the viewer who uses the service inputs the postal code and address of the merchandise delivery destination based on the display screen of FIG. 8B and inputs an instruction to move to the next display screen, next, FIG. As shown in (C), the content of the user input auxiliary information “ui3.xml” is displayed.

  In the screen based on the user input auxiliary information “ui3.xml” shown in FIG. 8C, a list of books to be purchased, a postal code and an address of a product delivery destination, and a purchase button are displayed.

  Transmission data is created in the data creation unit 109 based on the selected sub-content data and the user operation accepted by the user input unit 114 as the sub-content data is played back (step S209).

  In the specific example of the sub-content data shown in FIG. 3, the transmission data information “data1.xml” includes a description for including the selection result of the book to be purchased in the transmission data that is a formatted message. The transmission data information “data2.xml” includes a description for including the postal code and address of the merchandise delivery destination in the transmission data. Therefore, in the case of the specific example described above, in step S209, the data creation unit 109 selects a book to be purchased, which is input from the viewer along the display screen of FIG. 8A based on the transmission data information. Transmission data including the result and the postal code and address of the merchandise delivery destination input from the viewer along the display screen of FIG.

  FIG. 9 is a diagram showing a specific example of transmission data transmitted from the program content reproduction apparatus to the server. As shown in FIG. 9, the transmission data includes information input by the service user (in this case, the book to be purchased and information on the merchandise delivery destination).

  The transmission data is transmitted from the communication unit 103 to the server 112 (step S210). That is, in the case of the above specific example, when the viewer using the service selects the purchase button based on the display screen of FIG. 8C, the data transmission unit 110, based on the transmission destination information “send.xml”, The communication unit 103 transmits the transmission data including the book to be purchased and the postal code and address of the merchandise delivery destination created in step S209 to the transmission destination specified by the transmission destination information. Note that the server 112 that is the transmission destination may be a server different from the server that transmitted the sub-content data in step S203.

  In addition, as a method of acquiring the above-described sub content data, instead of the method of acquiring from the server 112 in the communication unit 103, recording such as a DVD (Digital Video Disk), a CD (Compact Disk), and an SD (Secure Digital) card is possible. A method of acquiring sub-content data from a medium may be used. In this case, the program content reproduction apparatus 113 includes a recording medium reading unit instead of (or in addition to) the communication unit 113, and acquires sub-content data from the recording medium using the reading unit.

  Alternatively, the above-described sub content data may be acquired by the broadcast receiving unit 101 by being included in a broadcast wave and transmitted.

  Next, authentication information and authentication processing in the sub-content data authentication unit 105 in step S205 will be described. FIG. 10 is a diagram illustrating an outline of an authentication method using an electronic signature based on a public key cryptosystem as an authentication method in step S205.

  Referring to FIG. 10, the sub-content provider who provides sub-content data 1003 from server 112 prepares a pair of secret key 1001 and public key 1002. An electronic signature 1004 is added to the provided sub-content data 1003 using a secret key 1001. The sub-content data 1003 to which the electronic signature 1004 is added is output from the server 112 via communication means such as the Internet, and is received by the communication unit 103 of the program content reproduction apparatus 113.

  The sub-content provider requests the broadcast station 111 to broadcast the public key 1002 during the broadcast time of the related program content 1005, and the public key 1002 is entrusted from the server 112 to the broadcast station 111.

  When the broadcast station 111 recognizes that the sub-content data 1003 is related to the program content 1005, the broadcast station 111 uses the broadcast wave to broadcast the public key 1002 entrusted by the sub-content provider together with the program content 1005. It transmits to the content reproduction apparatus 113.

  In the program content reproduction device 113, the program content reproduction unit 102 reproduces the program content 1005 included in the broadcast wave received by the broadcast reception unit 101. At the same time, the sub-content data authenticating unit 105 confirms the validity of the electronic signature 1004 added to the sub-content data 1003 using the public key 1002 paired with the private key 1001 received from the broadcast wave. Sub-content data 1003 is authenticated. That is, in order to associate the sub-content data 1003 with the program, the sub-content data 1003 needs to be authenticated by confirming the validity of the electronic signature 1004 added by the sub-content data authentication unit 105. Requires a public key 1002 that is paired with a private key 1001. For this reason, even if a malicious third party has created sub-content data created by himself / herself, the broadcast receiving unit 101 has received the false information provided to the user that it is related information of the program without obtaining permission from the broadcasting station. If the private key 1001 corresponding to the public key 1002 included in the broadcast wave is obtained and the electronic signature 1004 is not performed, the sub-content data authenticating unit 105 cannot authenticate the sub-content data. Therefore, in order to falsely provide such sub-content data to the viewer as being related to the program content 1005, it is necessary to obtain the secret key 1001 corresponding to the public key 1002 included in the broadcast wave, Providing such malicious sub-content data is very difficult.

  Further, an electronic signature 1004 added to the sub content data 1003 and an authentication process in the sub content data authentication unit 1005 will be described.

  The sub-content data shown in FIG. 3 includes signature information “signature.xml” describing an electronic signature. This signature information is preferably information obtained by encrypting the hash value of the part excluding the signature information from all the information included in the sub-content data shown in FIG.

  In this case, in step S205, the sub-content data authentication unit 105 calculates a hash value of a part obtained by removing the signature information from all information included in the sub-content data, and the signature information “signature” included in the sub-content data. .Xml "is decrypted using the public key 1002 included in the broadcast wave received from the broadcast station 111 by the broadcast receiving unit 101. If the two values match, it is determined that the sub-content data has been authenticated. Here, only the hash value is described as the electronic signature. For example, the XML (Extensible Markup Language) -based electronic signature language “XML Signature” standardized by W3C (World Wide Web Consortium) is used. You may do it.

  Note that sub-content data authentication in the sub-content data authenticating unit 105 is performed in place of the above-described method performed by verifying the electronic signature included in the sub-content data using the public key included in the broadcast wave. Or a simple method such as matching of character strings may be used. That is, the sub content data authenticating unit 105 may authenticate the sub content data by verifying a match between the ID included in the broadcast wave and the ID included in the sub content data.

  By executing the above-described processing in the program content playback apparatus according to the present embodiment, the program content playback apparatus is related to the program among sub-content data such as templates acquired by communication means other than broadcasting (such as the Internet). The presence of sub-content data to be displayed can be presented to the viewer during the program broadcast. Furthermore, a list of only sub-content data related to a program can be displayed during the broadcast of the program. Alternatively, the sub-content data related to the program and the sub-content data not related to the program can be displayed while broadcasting the program by changing the display form of the list.

  Therefore, the viewer can select reproduction of desired sub-content data based on the list. The program content reproduction apparatus can reproduce the sub content data selected by the user based on the displayed list.

  Further, the program content reproduction apparatus can create transmission data based on information included in the sub content data and input from the user, and transmit the transmission data to a predetermined destination.

[Second Embodiment]
In the first embodiment, the authenticated sub-content data is displayed on the program content and reproduced after the user selection. In the second embodiment, the user's selection is not waited for. The sub content data is automatically reproduced.

  FIG. 11 is a block diagram illustrating a specific example of a functional configuration of the program content reproduction apparatus 113 according to the second embodiment. Each function shown in FIG. 11 is also realized in the program content reproduction apparatus 113 by the control unit 120 reading and executing a program stored in the storage unit 130 and controlling each unit shown in FIG.

  Referring to FIG. 11, program content reproduction apparatus 113 according to the second embodiment includes sub-content data presence display among the functions of program content reproduction apparatus 113 according to the first embodiment shown in the figure. Instead of the unit 106 and the sub-content data selection unit 107, a sub-content data priority acquisition unit 1101 is included.

  The sub content data authentication unit 105 inputs the authentication result to the sub content data priority acquisition unit 1101. Based on the authentication result input from the sub-content authentication unit 105, the sub-content data priority acquisition unit 1101 acquires the priority of the authenticated sub-content data, selects reproducible sub-content data, and selects the selection result. The data is input to the sub content data reproduction unit 108.

  FIG. 12 is a flowchart illustrating a specific example of processing in the program content reproduction apparatus 113 according to the second embodiment. The processing shown in the flowchart of FIG. 12 is also realized by causing the control unit 120 to read out and execute a program stored in the storage unit 130 to exhibit each function shown in FIG. Of the processes shown in the flowchart of FIG. 12, the processes in steps S201 to S205, S209, and S210 are the same as those in the program content playback apparatus 113 according to the first embodiment shown in the flowchart of FIG. is there. Therefore, here, a process different from the process in the program content reproduction apparatus 113 according to the first embodiment will be described.

  Referring to FIG. 12, as a result of the processing in step S205, when authenticated subcontent data is in subcontent data storage unit 104 (YES in step S205), among the subcontent data authenticated in step S205, If there is a plurality of pieces of sub-content data, the sub-content priority acquisition unit 1101 selects the one with the highest priority (step S1206). . In step S1206,. The selected sub content data is reproduced by the sub content data reproducing unit 108 (step S1207).

FIG. 13 is a diagram illustrating a specific example of the sub content data according to the second embodiment.
The sub-content data according to the present embodiment is configured to further include activation information “invoke.xml” in addition to the information included in the sub-content data according to the first embodiment shown in FIG. The The activation information “invoke.xml” describes whether or not the content data can be reproduced without waiting for the user's selection, and the priority.

  In step S1206, the sub-contents priority acquisition unit 1101 refers to this information and selects sub-content data that can be reproduced without waiting for the user's selection and has the highest priority.

[Third Embodiment]
In the third embodiment, the public key validity period will be described.

  In the program content reproduction apparatus 113 shown in the first embodiment and the second embodiment, the sub-content data is authenticated in units of program content. Therefore, for example, once the public key is transmitted to the program content reproduction device 113 at the start of broadcast of the program content, the authentication of the sub content data can be realized during the reproduction of the program content. In the third embodiment, a method for realizing authentication not in units of program contents but in units of time will be described.

  FIG. 14 is a diagram showing a specific example of the relationship between the program content broadcast period and the public key validity period.

  Referring to FIG. 14, public key 1 and public key 2 have the same valid period as the broadcast period of the corresponding program content. The public key having such a relationship is the public key described in the first embodiment and the second embodiment.

  The validity period of the public key may not coincide with the broadcast period of the corresponding program content. As shown in the public key 3 and the public key 4, the validity period is only a part of the broadcast period of the corresponding program content. It may be effective. Alternatively, as indicated by the public key 5, the valid period may extend over the broadcast periods of a plurality of program contents.

  The broadcast station provides such a public key to the program content reproduction apparatus 113 according to the second embodiment, for example, so that the broadcast station desires to authenticate specific sub-content data in the program content reproduction apparatus 113. Can be realized in time. That is, it is possible to reproduce specific sub-content data in the program content reproduction device 113 at a time desired by the broadcasting station. These can be realized by adding a validity period to the public key.

  In each of the above embodiments, a template is shown as a suitable example of the sub-content data. However, the template includes authentication information that can be reproduced and can be authenticated by the sub-content data authentication unit 105 such as an electronic signature or an ID. The data may be general AV (Audio Visual) data such as MPEG-7 (Moving Picture Experts Group) format data. Since data in the MPEG-7 format can include metadata in the data, authentication information can be described as the metadata.

  Further, in each of the above embodiments, a mobile phone is shown as the most preferable example of the program content reproduction apparatus according to the present invention. However, the program content reproduction apparatus according to the present invention is a television receiver, a personal computer. It is also possible to apply to PDA (Personal Digital Assistants) or the like. These devices may be stationary or portable.

  Furthermore, the sub-content playback method executed by the above-described program content playback apparatus can also be provided as a program. Such a program can be recorded on a computer-readable recording medium such as a flexible disk attached to the computer, a CD-ROM, a ROM, a RAM, and a memory card, and provided as a program product. Alternatively, the program can be provided by being recorded on a recording medium such as a hard disk built in the computer. A program can also be provided by downloading via a network.

  The provided program product is installed in a program storage unit such as a hard disk and executed. The program product includes the program itself and a recording medium on which the program is recorded.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a block diagram which shows the specific example of a function structure of the program content reproduction apparatus 113 concerning 1st Embodiment. It is a flowchart which shows the specific example of the process in the program content reproduction apparatus 113 concerning 1st Embodiment. It is a figure which shows the specific example of the sub content data concerning 1st Embodiment. It is a figure which shows the specific example of the program content reproduced | regenerated by step S202. It is a figure which shows the 1st specific example of the method of presenting presence of sub content data in step S206. It is a figure which shows the 2nd specific example of the method of presenting presence of sub content data in step S206. It is a figure which shows the specific example of the selection method of the sub content data in step S207. It is a figure which shows the specific example of a screen display when subcontent data are reproduced | regenerated in the subcontent data reproduction part 108 by step S208. It is a figure which shows the specific example of the transmission data transmitted to a server from a program content reproduction apparatus. It is a figure explaining the outline | summary of the authentication method using the electronic signature by a public key cryptosystem as an authentication method in step S205. It is a block diagram which shows the specific example of a function structure of the program content reproduction apparatus 113 concerning 2nd Embodiment. It is a flowchart which shows the specific example of the process in the program content reproduction apparatus 113 concerning 2nd Embodiment. It is a figure which shows the specific example of the sub content data concerning 2nd Embodiment. It is a figure which shows the specific example of the relationship between the broadcast period of program content, and the effective period of a public key. It is a figure which shows the specific example of the hardware constitutions of the program content reproduction apparatus 113 concerning this Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 Broadcast receiving part, 102 Program content reproduction part, 103 Communication part, 104 Sub content data storage part, 105 Sub content data authentication part, 106 Sub content data presence display part, 107 Sub content data selection part, 108 Sub content data reproduction part 109 data creation unit 110 data transmission unit 111 broadcast station 112 server 113 program content playback device 114 user input unit 120 control unit 130 storage unit 140 input / output unit 142 key code input device 144 display 146 Microphone, 148 speaker, 149 camera, 150 communication unit, 1101 sub-content priority acquisition unit.

Claims (9)

Broadcast receiving means for acquiring program content and authentication information;
Program content reproducing means for reproducing the program content;
Sub-content data storage means for storing sub-content data;
Sub-content data authentication means for authenticating sub-content data stored in the sub-content data storage means based on the authentication information;
A program content reproduction apparatus comprising: subcontent data presence presentation means for presenting the presence of the subcontent data during reproduction of program content in the program content reproduction means based on an authentication result of the subcontent data authentication means.   2. The program content reproducing apparatus according to claim 1, wherein the sub-content data presence presenting means presents only the presence of the sub-content data authenticated by the sub-content data authenticating means.   2. The program content reproduction according to claim 1, wherein the sub-content data existence presenting means presents the sub-content data authenticated by the sub-content data authenticating means and the sub-content data not authenticated in different forms. apparatus. The authentication information is a public key;
The sub-content data is attached with an electronic signature by a secret key paired with the public key,
2. The program content reproduction apparatus according to claim 1, wherein the sub-content data authenticating unit authenticates the sub-content data by confirming the validity of the electronic signature using the public key. Sub-content data selection means for selecting sub-content data whose presence is presented by the sub-content data presence presentation means;
The program content reproduction apparatus according to claim 1, further comprising sub-content data reproduction means for reproducing the sub-content data selected by the sub-content data selection means. Message creation means for creating a formatted message by information contained in the sub-content data and input from a user;
6. The program content reproduction apparatus according to claim 5, further comprising message transmission means for transmitting a message created by the message creation means. An acquisition means for acquiring the sub-content data from another device;
2. The program content reproduction apparatus according to claim 1, wherein communication means different from the broadcast receiving means and the obtaining means are used. Broadcast receiving means for acquiring program content and authentication information;
Program content reproducing means for reproducing the program content;
Sub-content data storage means for storing sub-content data;
Sub-content data authentication means for authenticating sub-content data stored in the sub-content data storage means based on the authentication information;
A program content reproduction apparatus, comprising: sub-content data reproduction means for reproducing the sub-content data authenticated by the sub-content data authentication means. The sub-content data has priority,
9. The sub-content data reproducing unit reproduces the sub-content data having the highest priority when there are a plurality of sub-content data authenticated by the sub-content data authenticating unit. The program content reproduction apparatus described.

Images