JP2005198161A - Method, program, server for collecting viewer information, information addition server and broadcast receiving terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology for protecting privacy of a viewer from eavesdropping in a transfer process of viewer information to be collected regarding technology for collecting information from the viewer via a network in broadcast utilizing the Internet, etc. <P>SOLUTION: The viewer information e is collected from the viewer B of the broadcast utilizing the Internet by the technology including a broadcasting station A which distributes a broadcast program (a) at least including an information list c, an encryption key K<SB>p</SB>and video content b, a broadcast receiving terminal 60 which encrypts the viewer information e which the viewer B creates by being prompted by the distributed information list c by the encryption key K<SB>p</SB>and transmits the information to the Internet 20, a viewer information collection server 80 which receives the encrypted viewer information f and decrypts it by a decryption key K<SB>I</SB>paired with the encryption key K<SB>p</SB>. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for collecting information from viewers in a network-based broadcast performed through a network such as the Internet or a broadcast using radio waves.

Conventionally, a method of using a telephone line as a method for collecting information from viewers of broadcast programs (hereinafter referred to as a viewer information collecting method) by broadcast stations, audience rating survey organizations, program production companies, etc. In some cases, a dedicated terminal for collecting information is prepared (see, for example, Patent Document 1).
Recently, with the development of the Internet, there is a method of connecting a broadcast receiver to the Internet and collecting information from viewers via the Internet (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 11-275607 (paragraphs 0009 to 0036, FIG. 1) Japanese Unexamined Patent Publication No. 11-75224 (paragraphs 0006 to 0016, FIG. 4)

  However, the conventional viewer information collecting method described above has the following problems. That is, in the case of using the above-described telephone line, there is a problem that it takes time and effort to make a telephone call and connect the line every time a viewer transmits information to a broadcasting station or the like. On the other hand, the method of preparing a dedicated terminal for collecting information is to improve this operational problem, but it will install an extra terminal, and it burdens the viewer with the installation space of the dedicated terminal. There is a problem. In addition, viewer information is leaked on the telephone line, and there is a problem in protecting the privacy of the viewer.

  On the other hand, in the case of information collection via the Internet, if there is a constant connection to the Internet, there will be a problem with the operability related to the connection, such as when using the above-mentioned telephone line, and a problem with the installation space because a dedicated terminal is unnecessary. Will be resolved. However, the method using the Internet has a fundamental information security problem that it is easy for a third party to eavesdrop on the Internet, and privacy protection for viewers is insufficient.

  For this reason, in viewer information collection using the Internet, information is protected using SSL (Secure Socket Layer), which is a network security technology. However, in order to use SSL, as a preliminary preparation, it is necessary to perform communication several times between two parties performing communication, resulting in an increase in communication cost. In addition, there is a problem that if this pre-preparation is eavesdropped, the security in SSL will be ineffective.

  The present invention has been made for the purpose of solving the above-described problems, and in the technology for collecting information from a broadcast viewer using a network or radio waves, the viewer information transmitted by the viewer is being transmitted. Viewer information collecting method, viewer information collecting server, information adding server, and broadcast receiving terminal device for protecting the information of the virtue and protecting the privacy of the viewer in such a manner that the contents cannot be decrypted even if wiretapped Is intended to provide.

  The present invention was devised to achieve the above-described object. First, the viewer information collection method according to claim 1 receives a broadcast program distributed from a broadcast station via radio waves or a network. In a viewer information collecting method for collecting viewer information from a broadcast receiving terminal device, a broadcast program distribution step, a program display step, a viewer information generation step, a viewer information encryption step, and an encrypted information transmission And a decoding step.

  According to this method, in the broadcast program distribution step, the broadcast program is distributed from the broadcast station to the broadcast receiving terminal device using radio waves or a network. The broadcast program includes at least an information list, an encryption key, and video content. The information list includes at least a transmission destination address and display information. Here, the display information is information that a broadcasting station or the like calls for provision of information from the viewer, and is information that is displayed to the viewer together with the video content video. For example, problems in a quiz program, questions in a questionnaire collection, and the like are included.

In the program display step, the distributed broadcast program is received by the broadcast receiving terminal device, and the video content and the display information are displayed from a display device such as a monitor screen. Next, in the viewer information generation step, the viewer information is generated by the broadcast receiving terminal device based on the displayed display information.
In the viewer information encryption step, the viewer information is encrypted with the encryption key to generate encrypted viewer information.

  Next, in the encrypted information transmission step, the encrypted viewer information is transmitted to the transmission destination address of the viewer information collection server having the decryption key via the network. The decryption key is used to decrypt the encrypted viewer information into the original viewer information. In the decryption step, the encrypted viewer information is received at another location on the network and decrypted with the decryption key to obtain the original viewer information.

  The viewer information collecting method according to claim 2 is a viewer information collecting method for collecting viewer information from a broadcast receiving terminal device that receives a broadcast program distributed from a broadcasting station via radio waves or a network. It includes a broadcast program distribution step, a program display step, a viewer information generation step, a viewer information encryption step, an encryption information transfer step, and a decryption step.

  According to this method, the encrypted viewer information generated in the viewer information generation step after the processing of the broadcast program distribution step and the program display step is performed in the viewer information encryption step. After being transmitted to the transmission address of the server via the network, from the viewer information distribution server to a viewer information collection server having a decryption key corresponding to the encrypted viewer information via the network Will be transferred. Then, the process in the decoding step described above is performed.

  The invention of claim 2 is effective in the case where the corresponding decryption keys are distributed to a plurality of different viewer information collection servers for a plurality of viewer information encrypted with separate encryption keys. . That is, encrypted viewer information transmitted from a plurality of viewers is aggregated once by a viewer information distribution server arranged in a broadcasting station or the like, and then viewer information having a corresponding decryption key. It will be distributed to the collection server. Thereby, when handling highly confidential viewer information, etc., only the relevant viewer information collection server receives the viewer information, so that the security of the personal information is maintained.

  The information addition server according to claim 3, wherein the broadcast program including the video content, the encryption key, and the information list is distributed from the broadcast server to the broadcast receiving terminal device via radio waves or a network, and based on the information list. In the broadcasting system in which the viewer information generated by the broadcast receiving terminal device is encrypted with the encryption key and then transmitted to the viewer information collection server having the decryption key, the information list is displayed as the broadcast program. An information addition server to be added to the image processing apparatus is characterized by comprising video content acquisition means, information addition means, and broadcast program transfer means.

  According to this configuration, the information addition server obtains the video content from the program server in which the video content is stored by the video content obtaining unit. Next, the information adding means adds the information list and the encryption key to the video content to generate the broadcast program. Then, the broadcast program is transferred to the broadcast server by the broadcast program transfer means, and the broadcast program is distributed from the broadcast server to the radio wave or the network.

  Thereby, the corresponding information list and encryption key can be automatically added to the video content. Information required by an organization such as a broadcasting station that collects information can be displayed on the video content for each broadcast program. Furthermore, if a plurality of pairs of decryption keys and encryption keys are used, different encryption keys are added for each broadcast program, and the corresponding decryption keys are distributed to different viewer information collection servers. The viewer information is allowed to be viewed only by the minimum necessary person, and the privacy of the viewer is more thoroughly protected.

  The broadcast receiving terminal device according to claim 4 is a broadcast receiving terminal device that receives a broadcast program distributed from a broadcast server via radio waves or a network, and the broadcast program includes an encryption key, video content, and information. The information list includes at least a transmission destination address and display information, and includes broadcast receiving means, program display means, encryption means, and encrypted information transmission means.

  According to such a configuration, the broadcast receiving terminal device receives the broadcast program by the broadcast receiving means. Next, in the program display means, the video content and the display information are displayed. Then, in the encryption means, the viewer information generated based on the display information displayed on the program display means is encrypted with the encryption key. Next, the encrypted information transmitting means transmits the encrypted viewer information to the transmission destination address via the network. As a result, even if viewer information is transmitted to a broadcasting station or the like via a network, it is encrypted, so even if wiretapping on the telephone line or wiretapping occurs on the Internet, the contents are decrypted. There is nothing to do.

  The viewer information collection server according to claim 5 is an encrypted viewer information obtained by encrypting viewer information generated in a broadcast receiving terminal device that receives a broadcast program distributed from a broadcast server via radio waves or a network. Is a viewer information collection server that collects information, and includes an information receiving means and a decoding means.

  According to this configuration, the viewer information collection server receives the encrypted viewer information by the information receiving means. Then, the decrypted means decrypts the encrypted viewer information into the original viewer information using the decryption key. As a result, the encrypted viewer information can be decrypted only by the limited viewer information collection server that owns the decryption key. As a result, the collected viewer information can be viewed only by the minimum necessary number of people, and it is possible to protect the information transmitted from the viewer and protect the privacy of the viewer.

  The viewer information collection server according to claim 6 is the viewer information collection server according to claim 5, further comprising key generation means for generating the decryption key and the encryption key. .

  According to such a configuration, the decryption key is generated and used in the viewer information collection server that decrypts the encrypted viewer information, and thus is not transferred. Thereby, since the decryption key is not stolen by a third party, the protection of information transmitted from the viewer and the privacy protection of the viewer are more thoroughly implemented.

  The viewer information collection server according to claim 7 is the viewer information collection server according to claim 6, wherein the encryption key generated by the key generation unit is transmitted to the network via the network. It has an encryption key transmission means for transmitting to an information addition server added to the broadcast program.

  According to such a configuration, the encryption key generated in the viewer information collection server can be automatically transmitted in a short time to the information addition server that adds the encryption key to the broadcast program. This will contribute to the efficiency of production of broadcast programs.

  The viewer information collection program according to claim 8, wherein the viewer information collection program is displayed together with the video content video in a broadcast receiving terminal device that has received a broadcast program including at least an encryption key, video content, a transmission destination address, and display information. In order to collect the viewer information generated based on the display information, the computer is caused to function as a broadcast program distribution unit, an information reception unit, and a decoding unit.

  According to such a configuration, a viewer information collecting program having the same operation and function as the first aspect of the invention can be obtained.

  The viewer information collection program according to claim 9, wherein the viewer information collection program is displayed together with the video content video in a broadcast receiving terminal device that has received a broadcast program including at least an encryption key, video content, a transmission destination address, and display information. In order to collect viewer information generated based on display information, a computer is made to function as a broadcast program distribution unit, an information reception unit, and an information transfer unit.

  According to such a configuration, a viewer information collecting program having the same operation and function as the invention of claim 2 can be obtained.

The viewer information collection method, the viewer information collection program, the viewer information collection server, the information addition server, and the broadcast receiving terminal device according to the present invention have the following excellent effects.
That is, according to the viewer information collecting method and the like according to the inventions of claim 1 and claim 8, when an organization such as a broadcasting station collects information on viewers of a broadcast program, the information created by the viewer is: Since it is encrypted with the encryption key added to the broadcast program and transmitted over the network, it is not decrypted even if it is intercepted by an unauthorized third party during transmission. In addition, when performing security processing on the viewer information to be transmitted, there is no inconvenience such as performing communication several times between two parties performing communication as in SSL. As long as the decryption key for decrypting the encrypted viewer information is strictly managed in the viewer information collection server, the collected viewer information can be viewed only by the minimum necessary person. , The privacy of the viewer is protected.

  According to the viewer information collecting method and the like according to the inventions of claim 2 and claim 9, the encryption key to be added is changed for each broadcast program and distributed to the viewer, and the corresponding decryption key is set to different viewer information. If owned by the collection server, the encrypted viewer information transmitted by the viewer is decrypted only by the viewer information collection server having the corresponding decryption key. Thereby, protection of the confidentiality of viewer information becomes more reliable.

  According to the information addition server of the third aspect of the invention, the information list and the encryption key are automatically added to the video content to form the broadcast program, which contributes to the efficiency of creating the broadcast program.

  According to the broadcast receiving terminal device of the fourth aspect of the invention, the viewer can browse an information list on which information provided from a broadcasting station or the like is posted while viewing the video content of the broadcast program. Can respond to a call for offers. Note that the viewer information created at the time of the response is transmitted after being encrypted with the encryption key attached to the broadcast program. Will not be leaked.

  According to the viewer information collection server according to the inventions of claims 5 to 7, the encrypted viewer information can be decrypted and converted into the original viewer information only in the viewer information collection server. It becomes possible. Furthermore, since this viewer information collection server includes a key generation means for generating a decryption key and an encryption key, the decryption key is not transferred, and the decryption key is securely managed. Thereby, protection of the confidentiality of viewer information becomes more reliable.

Embodiments of the present invention will be described below with reference to the drawings.
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a basic configuration of a network-based broadcast system which is an embodiment to which a viewer information collecting method according to the present invention is applied. FIG. 2 is a block diagram showing the configuration of the information addition server according to the present embodiment. FIG. 3 is a block diagram showing the configuration of the broadcast receiving terminal device according to the present embodiment. FIG. 4 is a block diagram showing the configuration of the viewer information distribution server according to the present embodiment. FIG. 5 is a block diagram showing the configuration of the viewer information collection server according to the present embodiment. FIG. 6 is a flowchart showing an operation flow of the viewer information collecting method according to the present embodiment.

First, with reference to FIG. 1, the structure of the network utilization broadcasting system 10 which is one Embodiment of this invention is demonstrated. Note that the components described in the claims are indicated in parentheses in order to clarify the relationship with the present embodiment.
The network-based broadcast system 10 includes at least a broadcast intranet 30 on the broadcast station A side connected to the Internet (network) 20 and a broadcast receiving terminal device 60 for viewing the broadcast program a on the viewer B side, The viewer information collection server 80 belonging to the information collection organization C is appropriately connected to the Internet 20.

  The broadcast intranet 30 is a LAN 33. The LAN 33 is installed in a broadcast station A that broadcasts a broadcast program a, and includes a program server 31, a broadcast server (broadcast program distribution means) 32, and an information addition server 40. And the viewer information distribution server 70 is connected. The broadcast intranet 30 is connected to the Internet 20 via the gateway 34, broadcasts the broadcast program a to the broadcast receiving terminal device 60 via the Internet 20, and information from the viewer B (viewer information e). To collect.

The program server 31 is a server that is connected to the LAN 33 and stores (accumulates) video content b constituting the broadcast program a.
The broadcast server (broadcast program distribution means) 32 is a server that is connected to the LAN 33, temporarily stores the broadcast program a before broadcasting, and distributes the broadcast program a to the Internet 20 according to the broadcast time. The broadcast program a temporarily stored in the broadcast server 32 is transferred from the program server 31 to the broadcast server 32 via the information addition server before the scheduled broadcast time, and is deleted from the broadcast server 32 after the broadcast ends. It will be. In addition to the video content b, various information (information list c, encryption key K _P, etc.) is added to the broadcast program a stored in the broadcast server 32 by the action of the information addition server 40 described later. .

  The gateway 34 is a contact point between the broadcast intranet 30 and the Internet 20, and is a device that connects the broadcast intranet 30 to the Internet 20. The gateway 34 is, for example, an IP router (IP: Internet protocol), and has a firewall function that prevents unauthorized access from the Internet 20 to the inside of the broadcast intranet 30.

The information addition server 40 is connected to the LAN 33 and retrieves the corresponding video content b from the program server 31 in response to a request from the broadcast server 32, and stores the information list c, the encryption method d, the encryption key K _{P and the} like. In addition, it is a server that generates a broadcast program a and transfers it to the broadcast server 32. As shown in FIG. 2, the information addition server 40 includes a communication device 41, an information list generation unit 42, an information list storage unit 43, and a controller 50.

Here, the information list c is information added to the broadcast program a distributed from the broadcast station A for the purpose of collecting information related to the broadcast program a from the viewer B side. More specifically, the information list c is a content that is displayed together with the video content b for the purpose of collecting opinions and the like from the viewer B for the broadcasting station A and the like, and calls the viewer B to provide information. Display information c ₂ (see FIG. 3) is included. Furthermore, a transmission destination address c _{1 that} is a transmission destination of the viewer information e created by the viewer in response to this information provision or automatically generated by the broadcast receiving terminal device 60 (FIG. 1) is included. For example, the display information c _2, the problem and of the quiz show, or a questions in the questionnaire collection.

The viewer information e is prompted by such display information c ₂ and is created by the viewer B, or the broadcast program a being viewed by the viewer B for the purpose of audience rating survey. A title or the like is automatically generated by the broadcast receiving terminal device 60.

  The encryption method d indicates a method for encrypting the viewer information e created in the broadcast receiving terminal device 60 as a response to the information list c. Here, an encryption method d using a public key is used, for example, RSA (acronym for developer Rivest, Shamir, Adleman) or an encryption method such as elliptic curve encryption.

The public key encryption method uses a pair of different keys (public key K _P and secret key K _I ) for information encryption and decryption. The secret key K _I is the viewer information. The public key K _P is an encryption key that is disclosed (distributed) to the viewer B, which is a decryption key that can be known only by the department that collects e (eg, the viewer information collection server 80). The viewer information e encrypted with a certain public key K _P can be decrypted only with the secret key K _I paired with the public key K _P.

When the public key method is adopted as the encryption method, the encryption key K _P added to the broadcast program a is the public key K _P paired with the private key K _I possessed by the viewer information collection server 80. is there. Then, as described above, the viewer information e created by the viewer B, the encrypted with the public key K _P, the viewer information encrypted e is decryption key (secret key) K _I Only the viewer information collection server 80 having the information can be decrypted.

The information list generation unit 42 creates an information list c to be added to the broadcast program a, and the created information list c is temporarily stored in the information list storage unit 43.
The controller 50 includes a storage request receiving unit 51, a determining unit 52, a transfer request transmitting unit 53, a video content receiving unit (video content obtaining unit) 54, an information list / public key adding unit (information adding unit) 55, and a broadcast program transferring unit. (Broadcast program transfer means) 56. The controller 50 performs control or management of processing performed by the information addition server 40 on the broadcast intranet 30 via the communication device 41.

The accumulation request receiving unit 51 receives a request (broadcast program accumulation request g) from the broadcast server 32 that the broadcast server 32 (FIG. 1) wants to accumulate the broadcast program a.
The determination unit 52 receives the broadcast program accumulation request g from the broadcast server 32 and confirms whether or not the information list c to be added to the broadcast program a exists in the information list accumulation unit 43. Then, information on the presence / absence of the information list c to be added to the broadcast program a is output to the transfer request transmission unit 53.

  If the information list c to be added to the broadcast program a does not exist in the information list storage unit 43, the transfer request transmission unit 53 sends the video content b corresponding to the broadcast program a to the program server 31 (FIG. 1). Is requested to be transmitted to the broadcast server 32. The video content b transferred to the broadcast server 32 is delivered to the Internet 20 as it is as the broadcast program a at the scheduled broadcast time. Further, if the information list c to be added to the broadcast program a exists in the information list storage unit 43, the transfer request transmission unit 53 transfers the corresponding video content b to the information addition server 40 to the program server 31. It is what you request.

The video content receiving unit (video content obtaining means) 54 receives the video content b transferred from the program server 31 and outputs it to the information list / public key adding unit 55.
The information list / public key adding unit (information adding means) 55 takes out the information list c corresponding to the input video content b from the information list storage unit 43 and adds the encryption key (public key) K _P together. Broadcast program a is generated.
The broadcast program transfer unit (broadcast program transfer means) 56 transfers the broadcast program a generated by the information list / public key addition unit 55 to the broadcast server 32 via the communication device 41.

The broadcast receiving terminal device 60 (FIG. 1) receives the broadcast program a distributed from the broadcasting station A to the Internet 20 and enables the viewer B to view the program. Furthermore, the broadcast receiving terminal device 60 displays the contents of the information list c added to the broadcast program a, and encrypts the viewer information e created by the viewer with the encryption key (public key) K _P. Is sent back to the broadcasting station A side.

  As shown in FIG. 3, the broadcast receiving terminal device 60 includes a broadcast receiving unit (broadcast receiving unit) 61, a separating unit 62, an encrypted program display unit (program display unit) 63, an information creation unit 64, and an encryption unit (encryption). Means) 65 and an encrypted information transmitting unit (encrypted information transmitting means) 66. Although omitted in FIG. 1, the broadcast receiving terminal device 60 is connected to the Internet 20 via a provider, and a plurality of broadcast receiving terminal devices 60 are connected on the Internet 20.

The broadcast receiving unit (broadcast receiving means) 61 receives the broadcast program a distributed on the Internet 20 (FIG. 1) and outputs it to the separating unit 62.
The separation unit 62 separates the input broadcast program a into video content b and added information (information list c, encryption key K _P, etc.).
The program display unit (program display means) 63 reproduces and displays the separated video content b and information list c on a display device (not shown).

The information creating unit 64 creates the viewer information e using an input device (for example, a keyboard, a mouse, a remote controller, or the like) provided in the broadcast receiving terminal device 60. The viewer B prompted the display information c ₂ displayed on the display unit (not shown) creates a viewer information e by the operation of the input device. Alternatively, the viewer information e may be automatically created based on the function of the information creation unit 64. For example, for the purpose of audience rating survey, the title of the broadcast program a being viewed is automatically created and becomes viewer information e. The created viewer information e is output from the information creation unit 64 to the encryption unit 65.

The encryption unit (encryption means) 65 encrypts the viewer information e input from the information creation unit 64 with the encryption key K _P (public key on the broadcasting station A side) separated from the broadcast program a in the separation unit 62. Encryption is performed based on the encryption method d. Then, the encryption unit 65 outputs the encrypted viewer information (encrypted viewer information f) to the encryption information transmission unit 66.

The encrypted information transmitting unit (encrypted information transmitting means) 66 transmits the input encrypted viewer information f to the broadcasting station A side via the Internet 20.
Thus, the viewer information e created by the broadcast receiving terminal device 60 may include information related to the privacy of the viewer B. Therefore, if the viewer information e is encrypted and then transmitted to the Internet 20, even if the encrypted viewer information f is received by an unauthorized third party, a pair of decryption keys (secret keys) not decrypted does not have a key) K _I, so that the privacy of the viewer B is protected.

  The viewer information distribution server 70 is connected to the LAN 33 as shown in FIG. 1, and includes an information receiving unit 71, a delivery destination confirmation unit 72, an information transfer unit (information transfer means) 73, and an address DB 74 as shown in FIG. It is prepared for. The viewer information distribution server 70 receives the viewer B side information (encrypted viewer information f) transmitted from the broadcast receiving terminal device 60 via the Internet 20 (FIG. 1), and receives the viewer information collection server. It has a function of transferring the received encrypted viewer information f to 80.

The information receiving unit 71 receives the encrypted viewer information f transmitted from the broadcast receiving terminal device 60 via the Internet 20.
The delivery destination confirmation unit 72 confirms the transfer destination of the received encrypted viewer information f from the addresses registered in the address DB 74. And the transfer destination, a viewer information collecting server 80 having a decryption key (secret key) K _I to decrypt the encrypted viewer information f, specifically, the viewer information e (Fig. 5) For example, an audience rating survey company is included as the information collection organization C intended to collect the information.

The information transfer unit (information transfer unit) 73 transmits the encrypted viewer information f received toward the address confirmed by the distribution destination confirmation unit 72.
In the address DB 74, for example, a plurality of public key K _P and private key K _I pairs are issued, different public keys K _P are added for each broadcast program a, and each viewer information e is collected as separate viewer information. When receiving by the server 80, the address of the viewer information collecting server 80 is registered.

  The viewer information collection server 80 (FIG. 1) receives the encrypted viewer information f sent from the viewer information distribution server 70 via the Internet 20, and receives the received encrypted viewer information f. It is a server that executes decryption and collects decrypted viewer information e. The viewer information collection server 80 is arranged in a department or organization in charge of information collection (for example, an audience rating research company), and is different from the broadcast station A and the viewer B as shown in FIG. It may be provided in the collection organization C) or may be arranged inside the broadcast intranet 30 although not shown. Further, as shown in FIG. 5, the viewer information collecting server 80 includes an information receiving unit (information receiving unit) 81, a decrypting unit (decrypting unit) 82, an information collecting unit 83, and a key generating unit (key generating unit). And an encryption key transmission unit (encryption key transmission means) 85.

The information receiving unit (information receiving means) 81 receives the encrypted viewer information f transmitted from the viewer information distribution server 70 (FIG. 1) via the Internet 20 or the LAN 33.
The decoding unit (decoding means) 82, by the action of the decryption key (secret key) K _I encryption viewer information f, is decoded in the viewer information e viewer B is created in the broadcast receiving terminal apparatus 60 Is. Note that the decryption key (secret key) K _I is a key forming a public key K _P and pair used to encrypt the broadcast receiving terminal apparatus 60, so that it is not known to a third party, viewers It is created by the key generation unit 84 provided inside the information collection server 80.

Incidentally, the key generating unit 84, together with the generated decryption key (secret key) K _I, this and also the encryption key (public key) K _P in the pair generates the generated encryption key K _P is encrypted The information is distributed to the information addition server 40 via the Internet 20 by the activation key transmission unit 85. Note that the means for distributing the encryption key (public key) K _P to the information addition server 40 is not limited to the method of passing through the encryption key transmission unit 85, and for example, any transportation means such as mail may be used. .
The information collecting unit 83 collects and stores the decrypted viewer information e.

In this way, the encrypted viewer information f is decrypted in the viewer information collecting server 80, and the viewer information e is decrypted for the first time only when it is decrypted. Thus, the decryption key (secret key) K _I is, as long as not falling into the hands of tightly controlled third party, viewer information encrypted viewer information f is be eavesdropped by a third party in the transfer process There is no fear of e being deciphered, and the privacy of the viewer B is protected. In the above description, the encrypted viewer information f transmitted from the broadcast receiving terminal device 60 (FIG. 1) is once transferred to the viewer information collection server 80 via the viewer information distribution server 70. However, the encrypted viewer information f may be transferred directly from the broadcast receiving terminal device 60 (FIG. 1) to the viewer information collection server 80.

  Next, with reference to FIG. 1 and FIG. 6, an operation until the broadcast program a is distributed from the broadcasting station A via the Internet 20 and the viewer information e created by the viewer B is collected will be described. FIG. 6 is a flowchart showing an operation flow in the network-based broadcasting system according to the present invention.

  First, a broadcast program accumulation request g for the broadcast program a is made from the broadcast server 32 to the information addition server 40 (step S11). Next, in the information addition server 40, it is determined whether or not the information list c of the broadcast program a is stored in the information list storage unit 43 (FIG. 2). If not stored (step S12: No), the program server 31 Transfers the video content b directly to the broadcast server 32 (step S13). If the information list c of the broadcast program a is accumulated (step S12: Yes), a program transfer request h is issued to the program server 31 so as to transfer the video content b to the information addition server 40. Then, the video content b stored in the program server 31 is transferred to the information addition server 40 (step S14).

Then, the information addition server 40 that has received the video content b transferred from the program server 31 (step S15) extracts the corresponding information list c from the information list storage unit 43 (FIG. 2) and converts it into the video content b. It is added (step S16). At the same time, the public key (encryption key) K _{P of} the broadcasting station A is also added to the video content b (step S17). In this way, the video content b to which various information is added constitutes the broadcast program a and is transferred to and stored in the broadcast server 32 (steps S18 and S19). Then, the broadcast server 32 accumulating a plurality of broadcast programs a distributes the corresponding broadcast program a to the Internet 20 in accordance with the broadcast time (step S20).

Next, the broadcast program a flowing on the Internet 20 is received by the broadcast receiving terminal device 60 installed in the viewer B (step S21). Then, the encryption key (public key) K _P is separated from the broadcast program a input to the separation unit 62 (FIG. 3) (step S22). Next, the viewer B views the information of the display information c ₂ displayed along with the video of the video content b (step S23). Then, the viewer B who is prompted to provide information with reference to the display information c ₂ creates the viewer information e in the information creation unit 64 (FIG. 3) (step S24: Yes). If the viewer B refuses to create information (step S24: No), the subsequent processing is not executed and the operation flow ends. If performed viewer input information e (step S24: Yes), the separate encryption key (public key) K _P in step S22, the viewer information e is the encrypted encrypted viewer information f (Step S25). Then, the encrypted viewer information f is transmitted from the encrypted information transmitter 66 (FIG. 3) to the viewer information distribution server 70 that is the destination of the destination address c ₁ via the Internet 20 (step S26). .

Next, the viewer information distribution server 70 in the broadcasting station A receives the encrypted viewer information f transmitted via the Internet 20 (step S27). Then, from those addresses of the viewer information collecting server 80 possesses the private key K _I of the public key K _P paired with the encrypted viewer information f the encryption is registered in the address DB 74 (FIG. 4) The delivery destination (information collection organization C here) is determined by the selection (step S28). Next, the encrypted viewer information f is transmitted from the viewer information distribution server 70 to the distribution destination (information collecting organization C) via the Internet 20 (step S29).

Next, the viewer information collection server 80 of the information collection organization C receives the encrypted viewer information f flowing on the Internet 20 (step S30). When the encryption key (public key) K _{P obtained} by encrypting the viewer information e and the decryption key (secret key) K _I possessed by the information collection organization C are a pair (step S31: Yes), encryption viewer information f is decoding unit 82 is decoded by the decoding key (private key) K _I (FIG. 5), the viewer information e is created (step S32). The decrypted viewer information e is collected by the information collecting unit 83 (FIG. 5) (step S33). On the other hand, if the viewer information collection server 80 decryption key (secret key) K _I to be possessed, encryption key (public key) to encrypt the encryption viewer information f not the K _P and the pair, encryption viewing The viewer information f is not decoded into the viewer information e (step S31: No). Therefore, even if an unauthorized third party impersonates the information collection organization C and acquires the encrypted viewer information f, the encrypted viewer information f is not decrypted and the contents are not leaked.

As described above, the viewer information e viewer B created is encrypted by the broadcast program in addition to a distributed encryption key (public key) K _P. The encrypted encryption viewer information f becomes viewable only limited persons can see decryption key viewer information collecting server 80 having a (secret key) K _I. Thereby, the privacy protection of the viewer B who has transmitted the viewer information e is possible. Moreover, a further pair of the encryption key (public key) K _P and decryption key (secret key) K _I preparing a plurality adding different encryption key (public key) K _P for each broadcast program a In this case, it is possible to view the viewer information e collected only by the minimum necessary person, and privacy is thoroughly protected.

  The present embodiment described above is an example for explaining the present invention, and the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, as shown in FIG. 1, in this embodiment, the broadcast server 32 first makes a broadcast program accumulation request g to the information addition server 40. On the other hand, the broadcast server 32 may access the program server 31 first, and the procedure may be such that the presence of information to be added to the video content b is confirmed from the program server 31 to the information addition server 40.

Further, the encrypted viewer information f distributed from the viewer B side is once transferred to the information collecting organization C via the viewer information distribution server 70 of the broadcasting station A, but the broadcast program a The information may be transmitted directly from the broadcast receiving terminal device 60 to the information collection organization C with the destination of the transmission destination address c ₁ added to the viewer information collection server 80 as the viewer information collection server 80. Specifically, as shown by a broken line arrow in FIG. 6, the operation flow can be directly performed from step S26 to step S30.

  In addition, as an embodiment of the present invention, the broadcast program a distributed from the broadcasting station A is exemplified by the network use broadcasting system 10 distributed to the viewer B via a network such as the Internet 20, but in addition, It can also be applied to a case where the broadcasting mode is replaced with another case where the broadcasting form is different. The present invention is not limited to this embodiment, and an ID-based method may be applied as an encryption method for encrypting viewer information. In the network-based broadcasting system 10 (FIG. 1), each function unit can be realized as a function program by a computer, and the function programs can be combined to operate as a viewer information collection program. is there.

It is a block diagram which shows the basic composition of the network utilization broadcasting system which is one Embodiment to which the viewer information collection method in this invention is applied. It is a block diagram which shows the structure of the information addition server concerning one Embodiment of this invention. It is a block diagram which shows the structure of the broadcast receiving terminal device concerning one Embodiment of this invention. It is a block diagram which shows the structure of the viewer information distribution server concerning one Embodiment of this invention. It is a block diagram which shows the structure of the viewer information collection server concerning one Embodiment of this invention. It is a flowchart which shows operation | movement of the viewer information collection method concerning one Embodiment of this invention.

Explanation of symbols

10 Network-based broadcast system (broadcast system)
20 Internet (network)
32 Broadcast server (broadcast program distribution means)
40 Information addition server 54 Video content receiver (video content acquisition means)
55 Information List / Public Key Adding Unit (Information Adding Means)
56 Broadcast program transfer unit (broadcast program transfer means)
60 Broadcast receiving terminal device 61 Broadcast receiving unit (broadcast receiving means)
63 Program display section (program display means)
65 Encryption section (encryption means)
66 Encrypted information transmitting unit (encrypted information transmitting means)
70 viewer information distribution server 73 information transfer unit (information transfer means)
80 viewer information collection server 81 information receiving unit (information receiving means)
82 Decoding unit (decoding means)
84 Key generation part (key generation means)
85 Encryption key transmission unit (encryption key transmission means)
A broadcast station B viewer a broadcast program b video content c information list c ₁ destination address c ₂ display information e viewer information K _P public key (encryption key)
K _I secret key (decryption key)

Claims (9)

A viewer information collecting method for collecting viewer information from a broadcast receiving terminal device that receives a broadcast program distributed from a broadcasting station via radio waves or a network,
The broadcast program includes at least an encryption key, video content, and an information list, and the information list includes at least a transmission destination address and display information,
Broadcast program distribution step for distributing the broadcast program from the broadcast station;
A program display step in which the broadcast program distributed is received by the broadcast receiving terminal device and the video content and the display information are displayed;
Viewer information generation step of generating the viewer information in the broadcast receiving terminal device based on the displayed display information;
Viewer information encryption step in which the viewer information is encrypted by the encryption key to generate encrypted viewer information;
Encryption in which the encrypted viewer information is transmitted via the network to the transmission destination address of a viewer information collection server having a decryption key for decrypting the encrypted viewer information into the viewer information An information transmission step;
Receiving the encrypted viewer information, and decrypting the encrypted viewer information with the decryption key. A viewer information collecting method for collecting viewer information from a broadcast receiving terminal device that receives a broadcast program distributed from a broadcasting station via radio waves or a network,
The broadcast program includes at least an encryption key, video content, and an information list, and the information list includes at least a transmission destination address and display information,
Broadcast program distribution step for distributing the broadcast program from the broadcast station;
A program display step in which the broadcast program distributed is received by the broadcast receiving terminal device and the video content and the display information are displayed;
Viewer information generation step of generating the viewer information in the broadcast receiving terminal device based on the displayed display information;
Viewer information encryption step in which the viewer information is encrypted by the encryption key to generate encrypted viewer information;
After the encrypted viewer information is transmitted to the transmission address of the viewer information distribution server via the network, a decryption key corresponding to the encrypted viewer information is received from the viewer information distribution server. An encrypted information transfer step transferred via the network to a viewer information collection server having;
Receiving the encrypted viewer information, and decrypting the encrypted viewer information with the decryption key. Broadcast information including a video content, an encryption key, and an information list is distributed from a broadcast server to a broadcast receiving terminal device via radio waves or a network, and viewer information generated by the broadcast receiving terminal device based on the information list Is an information addition server that adds the information list to the broadcast program in a broadcast system that is encrypted with the encryption key and then transmitted to a viewer information collection server that possesses the decryption key,
Video content obtaining means for obtaining the video content from a program server in which the video content is stored;
Information adding means for generating the broadcast program by adding the information list and the encryption key to the video content;
A broadcast program transfer means for transferring the generated broadcast program to the broadcast server; A broadcast receiving terminal device that receives a broadcast program distributed from a broadcast server via radio waves or a network,
The broadcast program includes at least an encryption key, video content, and an information list, and the information list includes at least a transmission destination address and display information,
Broadcast receiving means for receiving the broadcast program;
Program display means for displaying the video content and the display information;
Encryption means for encrypting viewer information generated based on the display information displayed on the program display means with the encryption key to generate encrypted viewer information;
A broadcast receiving terminal device comprising: encrypted information transmitting means for transmitting the encrypted viewer information to the transmission destination address via a network. A viewer information collection server that collects encrypted viewer information encrypted by viewer information generated in a broadcast receiving terminal device that receives a broadcast program distributed from a broadcast server via radio waves or a network,
Information receiving means for receiving the encrypted viewer information;
A viewer information collection server, comprising: decrypting means for decrypting the encrypted viewer information into the viewer information using a decryption key.   6. The viewer information collection server according to claim 5, further comprising key generation means for generating the decryption key and the encryption key.   An encryption key transmission unit that transmits the encryption key generated by the key generation unit to an information addition server to which the encryption key is added to the broadcast program via the network. Item 7. The viewer information collection server according to item 6. The viewer information generated based on the display information displayed together with the video of the video content is collected in the broadcast receiving terminal device that has received the broadcast program including at least the encryption key, the video content, the transmission destination address, and the display information. Computer for
Broadcast program distribution means for distributing the broadcast program via radio waves or a network;
Encrypted viewer information obtained by encrypting the viewer information with the encryption key in the broadcast receiving terminal device is transmitted to the transmission destination address, and information reception for receiving the transmitted encrypted viewer information means,
A viewer information collecting program which functions as a decrypting means for decrypting the received encrypted viewer information into the original viewer information with a decryption key. The viewer information generated based on the display information displayed together with the video of the video content is collected in the broadcast receiving terminal device that has received the broadcast program including at least the encryption key, the video content, the transmission destination address, and the display information. Computer for
Broadcast program distribution means for distributing the broadcast program via radio waves or a network;
Encrypted viewer information obtained by encrypting the viewer information with the encryption key in the broadcast receiving terminal device is transmitted to the transmission destination address, and information reception for receiving the transmitted encrypted viewer information means,
A viewer information collection program that functions as information transfer means for transferring the encrypted viewer information to a viewer information collection server having a decryption key for the encrypted viewer information.

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