JP4836034B2 - Content distribution system, terminal device, target device, content distribution device, and content distribution method - Google Patents

Description

  The present invention relates to a content distribution system, a terminal device, a target device, a content distribution device, and a content distribution method, in particular, a content distribution system, a terminal device, a target device, and a content distribution device for distributing content from the content distribution device to the terminal device. And a content distribution method.

Conventionally, for example, predetermined data is transmitted from a terminal device possessed by a user to a content distribution apparatus that displays data such as images in a public place or an art museum and provides information to people, and the content distribution apparatus 2. Description of the Related Art A content distribution system that distributes data (hereinafter referred to as content) related to displayed image data to a terminal device is known (see, for example, Patent Document 1). In such a content distribution system, terminal device identification data such as an address of the terminal device is transmitted from the terminal device to the content distribution system by infrared rays or the like, and the content is distributed to the terminal device based on this address.
JP 2005-244469 A

  However, in the above conventional technique, there is a problem in terms of security protection and information leakage because it is necessary to transmit the terminal device identification data of the terminal device to the content distribution device. In particular, when infrared rays are used to transmit terminal device identification data, there is a risk that information leakage can easily occur if the infrared rays are intercepted by a third party.

  The present invention has been made in view of the above points, and its purpose is to prevent the identification data of the terminal device from being stolen by a third party when receiving content distribution from the content distribution device. To provide a content distribution system, a terminal device, a target device, a content distribution device, and a content distribution method that enable a user of the terminal device to know that communication is normally performed between the terminal device and the target device. It is in.

The present invention has been made to solve the above problem, and in a content distribution system including a terminal device, a target device, and a content distribution device, the terminal device generates a first session key. A key generation unit, a second session key generation unit that generates a second session key having a predetermined relationship with the first session key, and whether or not the first session key is received by the target device A reception confirmation key generation unit that generates a reception confirmation key to be confirmed, a first transmission unit that transmits the first session key and the reception confirmation key to the target device, and the target device from the target device A second transmission unit configured to transmit the second session key to the content distribution device when the reception confirmation key is received; A target device identification data storage unit for storing target device identification data for identifying the target device in advance, and the first session key when the first session key and the reception confirmation key are received from the terminal device; And a third transmitting unit that transmits the target device identification data stored in the target device identification data storage unit to the content distribution device and transmits the reception confirmation key to the terminal device. The distribution device includes a content storage unit that stores the target device identification data and the content in association with each other in advance, a first session key transmitted from the target device, and a second session key transmitted from the terminal device. A determination unit configured to determine whether or not a predetermined relationship is established; and the determination unit includes the first session key and the second session key. There and a content delivery unit for delivering to the terminal device the content corresponding to the transmitted target device identification data is read from the content storage unit from the target device if it is determined to have a predetermined relationship.
In the present invention, the first session key is transmitted from the terminal device to the content distribution device via the target device, and the second session key is directly transmitted from the terminal device to the content distribution device. When the determination unit of the content distribution device determines that the first session key and the second session key have a predetermined relationship, the content is distributed from the content distribution device to the terminal device. . In addition, when the first session key and the reception confirmation key are received from the terminal device, the third transmission unit transmits the reception confirmation key to the terminal device.
In the present invention, the terminal device can acquire the content from the content distribution device without transmitting the identification data of the terminal device to the target device. For this reason, it is possible to prevent the identification data of the own terminal device from being stolen by a third party when receiving the content distribution from the content distribution device.
In addition, when the first session key and the reception confirmation key are received from the terminal device, the reception confirmation key is transmitted from the target device to the terminal device. It is possible to know that communication is normally performed with the.

The present invention provides a content distribution system including a terminal device, a target device, and a content distribution device, wherein the terminal device includes a first session key generation unit that generates a first session key, the first session key, A second session key generation unit that generates a second session key having a predetermined relationship, and a reception confirmation that generates a reception confirmation key for confirming whether or not the first session key has been received by the target device A key generation unit; a first transmission unit that transmits the first session key and the reception confirmation key to the target device; and a second transmission unit that receives the reception confirmation key from the target device. A second transmission unit that transmits the session key to the content distribution device, the target device identifying target device identification data for identifying the target device When the target device identification data storage unit stored in advance and the first session key and the reception confirmation key are received from the terminal device, the first session key and the target device identification data storage unit store them. And a third transmission unit that continuously transmits the reception confirmation key to the terminal device, and the content distribution device includes the target device identification data. Whether or not the content storage unit that stores the content and the content in association with each other in advance and the first session key transmitted from the target device and the second session key transmitted from the terminal device have a predetermined relationship. And a determination unit that determines whether the first session key and the second session key have a predetermined relationship. In addition, the reception confirmation data indicating that the first session key and the second session key have a predetermined relationship are transmitted to the target device, and the target device is transmitted from the target device. A content distribution unit that reads out content corresponding to the identification data from the content storage unit and distributes the content to the terminal device, and the third transmission unit receives the reception confirmation data from the content distribution unit. When receiving, the continuous transmission of the reception confirmation key to the terminal device is stopped.
In the present invention, the terminal device can acquire the content from the content distribution device without transmitting the identification data of the terminal device to the content distribution device. For this reason, it is possible to prevent the identification data of the own terminal device from being stolen by a third party when receiving the content distribution from the content distribution device.
In addition, since the fact that the terminal device has received the reception confirmation data from the target device can be known by the reception of the reception confirmation data from the content distribution unit, the target device receives the reception confirmation data. Continuous transmission of reception confirmation data to the terminal device can be stopped.

The reception confirmation key generation unit of the present invention generates data other than terminal device identification data for identifying the terminal device as the reception confirmation key.
In the present invention, since the reception confirmation key generation unit generates data other than the terminal device identification data for identifying the terminal device as a reception confirmation key, the terminal device identification data is the third during communication between the terminal device and the target device. Can be prevented from being stolen.

The reception confirmation key generation unit of the present invention generates the reception confirmation key including a random number.
In the present invention, since the reception confirmation key generation unit generates the reception confirmation key using a random number, the terminal device cannot be identified from the target device, and a sufficiently large random number is used. It is possible to use a reception confirmation key that is unlikely to be duplicated.

The reception confirmation key generation unit of the present invention generates the reception confirmation key based on data obtained by combining terminal device identification data for identifying the terminal device and a predetermined counter value.
In the present invention, since the reception confirmation key generation unit generates the reception confirmation key based on data obtained by combining terminal device identification data for identifying the terminal device and a predetermined counter value, a third party Therefore, the risk of the reception confirmation key being decrypted can be reduced.

The reception confirmation key generation unit of the present invention generates the same key as the first session key generated by the first session key generation unit as the reception confirmation key.
In the present invention, since the reception confirmation key generating unit generates the same key as the first session key as the reception confirmation key, the process of generating the reception confirmation key can be omitted.

  In the terminal device that communicates with the target device and the content distribution device, the present invention provides a first session key generation unit that generates a first session key, and a second that has a predetermined relationship with the first session key. A second session key generation unit that generates a session key of the reception confirmation key generation unit that generates a reception confirmation key for confirming whether or not the first session key is received by the target device; A first transmission unit that transmits a first session key and the reception confirmation key to the target device; and distribution of the second session key when the reception confirmation key is received from the target device A second transmission unit for transmitting to the apparatus.

  The present invention further includes a notification unit that notifies that the reception confirmation key has been received when the reception confirmation key is received from the target device.

  In addition, the first transmission unit of the present invention transmits the first session key and the reception confirmation key to the target device using wireless communication.

  Further, the first transmission unit of the present invention transmits the first session key and the reception confirmation key to the target device using infrared communication.

  In addition, the second transmission unit of the present invention transmits the second session key to the content distribution device using wireless communication.

  The present invention provides a target device that communicates between a terminal device and a content distribution device, a target device identification data storage unit that stores in advance target device identification data for identifying the target device, and the first session key from the terminal device. When the reception confirmation key is received, the first session key and the target device identification data stored in the target device identification data storage unit are transmitted to the content distribution device and the reception confirmation key is used. And a third transmitter for transmitting to the terminal device.

  In the present invention, when reception confirmation data indicating that the first session key and the second session key have a predetermined relationship is received from the content distribution apparatus, the reception confirmation data is transmitted to the terminal. A fourth transmitter for transmitting to the apparatus is provided.

  According to the present invention, in a content distribution device that communicates with a terminal device and a target device, a content storage unit that stores target device identification data for identifying each target device and content in association with each other in advance, and a first transmitted from the target device A determination unit that determines whether or not a first session key and a second session key transmitted from the terminal device have a predetermined relationship; and the determination unit determines whether the first session key and the second session When it is determined that the key has a predetermined relationship, reception confirmation data indicating that the first session key and the second session key have a predetermined relationship is transmitted to the target device. In addition, the content corresponding to the target device identification data transmitted from the target device is read from the content storage unit and distributed to the terminal device. And a content distribution unit to be.

  The present invention provides a content distribution method using a terminal device, a target device, and a content distribution device, wherein the terminal device generates a first session key for generating a first session key, and the first session key. A second session key generating process for generating a second session key having a predetermined relationship with the receiver, and reception for generating a reception confirmation key for confirming whether or not the first session key has been received by the target device A confirmation key generation process; a first transmission process for transmitting the first session key and the reception confirmation key to the target apparatus; and the reception confirmation key when the reception confirmation key is received from the target apparatus. A second transmission step of transmitting the second session key to the content distribution device, and the target device identifies the target device identification for identifying the target device. A target device identification data storage process for storing data in advance, and when the first session key and the reception confirmation key are received from the terminal device, the first session key and the target device identification data storage process The stored target device identification data is transmitted to the content distribution device and a third transmission process of transmitting the reception confirmation key to the terminal device is executed. And determining whether or not a content storage process in which the first session key transmitted from the target device and the second session key transmitted from the terminal device have a predetermined relationship have a predetermined relationship And the first session key and the second session key have a predetermined relationship in the determination process. It said read the contents corresponding to the transmitted target device identification data from the target device to execute a content distribution process that distributes to the terminal device when it is determined.

  In the present invention, it is possible to prevent the identification data of the own terminal device from being stolen by a third party when receiving content distribution from the content distribution device, and communication between the terminal device and the target device is normally performed. That the user of the terminal device can know.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing an overview of a content distribution system 100a according to the first embodiment of the present invention. The content distribution system 100a includes a terminal device 10, a target device 20, a reference device 30, and content storage devices 40 (40a to 40c). The content distribution system 100a is a system for distributing content, which is data related to the target device 20, to the terminal device 10 possessed by the user. Here, the case where the reference device 30 and the content storage device 40 are separate devices has been described. However, the present invention is not limited to this, and the reference device 30 and the content storage device 40 are connected to the content distribution device. It may be configured by a single device.
As the target device 20, for example, there is a data display device that is installed in a city or the like and provides image data and character data to people. In this case, content related to the image data and character data is distributed to the terminal device 10. In addition, the target device 20 can be installed near an exhibit such as a painting or sculpture in a museum or the like, and content related to the exhibit can be distributed to the terminal device 10.

  In FIG. 1, the terminal device 10 generates two session keys SK1 and SK2, transmits one session key (referred to as SK1) to the reference device 30 via the target device 20, and the other session key (SK2). To the reference device 30 directly. The terminal device 10 also transmits an address on the network of the terminal device 10 to the reference device 30 as terminal device identification data for identifying the terminal device 10. The target device 20 transfers the session key SK1 to the reference device 30, and also includes a spot ID (Identification) which is target device identification data for identifying the target device 20, and a context ID (which indicates the current state of the target device 20). The content to be distributed can be made different depending on the context ID).

  The session key SK1 is transmitted from the terminal device 10 to the target device 20 by infrared communication. Therefore, the user goes to the vicinity of the target device 20 with the terminal device 10 and performs a predetermined operation with the terminal device 10 facing the target device 20. In addition, communication is performed between the reference device 30, the terminal device 10, and the target device 20 via a wired LAN (Local Area Network), a wireless LAN, or other network not shown.

The reference device 30 that has received the session keys SK1 and SK2 sent via two different paths collates the two session keys and determines whether or not the session keys SK1 and SK2 have a predetermined relationship. To do. In this example, the terminal device 10 generates two identical session keys SK1 and SK2, and these are transmitted to the reference device 30 through different paths.
In the present embodiment, the relationship that the session key SK1 and the session key SK2 are the same is used as the predetermined relationship, but other relationships may be used. For example, a hashed session key SK1 can be used as the session key SK2.

  When it is determined in the reference device 30 that the session keys SK1 and SK2 have the predetermined relationship, the reference device 30 obtains the content by the terminal device 10 (identifying the terminal device 10 by the transmitted address). As data to be transmitted, a URL (Uniform Resource Locator) indicating the location on the network 60 where the content is stored is transmitted to the terminal device 10. The URL to be transmitted is determined by the reference device 30 according to the spot ID and context ID received from the target device 20. In order to make the determination, the reference device 30 stores a correspondence table indicating the correspondence between the spot ID and context ID and the content URL.

  The content distributed to the terminal device 10 is stored in the content storage device 40 (40a to 40c). The terminal device 10 that has received the URL accesses the content storage device 40 corresponding to the URL via the network 60 and requests content. In response to the request, the content storage device 40 distributes the target content to the terminal device 10 via the network 60.

  Here, the session keys SK1 and SK2 generated by the terminal device 10 are configured not to include data unique to the terminal device 10 in order to prevent the terminal device 10 from being specified by the target device 20. In addition, since it is possible to determine that the session keys SK1 and SK2 acquired by two different paths in the reference device 30 are sent from the same terminal device 10, the session keys from other terminal devices are duplicated. The session keys SK1 and SK2 are configured as character strings not to be processed. The terminal device 10 uses the following method as a session key generation method that can obtain the session keys SK1 and SK2 that satisfy these conditions. In any of the following methods, since the session key is generated by the terminal device 10 alone, it is not necessary to manage the session key by providing, for example, some management server, and the system configuration can be simplified. it can.

(1) A case where a random number is used as a first method for generating a session key will be described. In this method, when generating the session key, the terminal device 10 generates a random number of a predetermined size (number of digits or number of bits) each time, and uses the generated random numbers as session keys SK1 and SK2. Since the session key generated by this method is generated randomly, the terminal device 10 cannot be identified by the target device 20, and a sufficiently large random number is used to prevent duplication. be able to.
When strict anonymity for the terminal device 10 is not required, a unique ID that can identify the terminal device 10 may be added to the generated random number. By doing so, it is possible to avoid duplication with session keys from other terminal devices.
The method of generating a session key using a random number in this way has an advantage that the session key generation process in the terminal device 10 is easy.

(2) A case where a hash function is used as a second method for generating a session key will be described. In this method, the terminal device 10 uses, as session keys SK1 and SK2, character strings obtained by hashing a character string obtained by combining an ID unique to the terminal device 10 and a predetermined counter value. The session key is given by h (unique ID + counter value) where h is a hash function. However, “+” represents a combination as a character string. Typical hash functions include MD5 (Message Digest 5) and SHA-1 (Secure Hash Algorithm 1), and any of them may be used. The counter value is a variable used to obtain a different session key every time even in the same terminal device 10. For example, the counter value is incremented by 1 each time a session key is generated.
Here, the input of the hash function includes the unique data of the terminal device 10, but since the hash function is an irreversible one-way function, the terminal device 10 is specified from the session keys SK1 and SK2 that are the outputs thereof. It is not possible to obtain high anonymity. In addition, due to the nature of the hash function, it is possible to generate a session key that is unlikely to overlap with a session key generated from another unique ID (another terminal device) or another counter value.
Thus, the method of generating a session key using a hash function also has an advantage that the session key generation process in the terminal device 10 is easy.
A variable other than the above “unique ID + counter value” may be used as the input of the hash function. For example, the session key may be obtained by hashing the random number (1) described above.

(3) A case where encryption is used as a third method for generating a session key will be described. In this method, the terminal device 10 uses, as session keys SK1 and SK2, character strings obtained by encrypting a character string obtained by connecting a unique ID to the terminal device 10 and a predetermined counter value. Any encryption method may be used as long as it is normally used in the field of information processing. The counter value is a variable used to obtain a different session key every time even in the same terminal device 10. For example, the counter value is incremented by 1 each time a session key is generated.
The session key generated by this method can obtain high anonymity by encryption and can be a session key that completely eliminates duplication with other session keys.

  (4) A case where a session key is generated by the reference device 30 will be described as a fourth method for generating a session key. In this method, the terminal apparatus 10 issues a session key issuance request to the reference apparatus 30 in advance, acquires the character string generated by the reference apparatus 30, and sets the acquired character strings as session keys SK1 and SK2. As a method for generating a character string (session key) in the reference device 30, for example, the same methods as (1) to (3) described above can be used. Since the reference device 30 itself generates a session key, it is possible to generate a session key so that duplication does not occur.

The terminal device 10 transmits a reception confirmation key K1 to the target device 20 simultaneously with the session key SK1. When the target device 20 receives the reception confirmation key K1, the target device 20 starts transmitting data including the reception confirmation key K1 as target device reception confirmation data to surrounding terminal devices by infrared rays.
Then, the terminal device 10 receives the target device reception confirmation data and confirms whether or not the reception confirmation key K1 transmitted by the terminal device 10 is included. If included, the terminal device 10 sends the session key SK2 to the reference device 30. A reception confirmation key K1 is transmitted. At this time, the terminal device 10 outputs to the user that the request from the user has been acquired by the target device 20. For example, the fact that the request from the user has been acquired by the target device 20 is displayed on the display screen of the terminal device 10.
When the reference device 30 receives the reception confirmation key K1 from the terminal device 10, the reference device 30 transmits data including the reception confirmation key K1 to the target device 20 as reference device reception confirmation data.
When the target device 20 receives the reference device reception confirmation data, the target device 20 stops transmitting the target device reception confirmation data corresponding to the reception confirmation key K1.

  FIG. 2 is a block diagram showing the configuration of the terminal device 10 in the content distribution system according to the first embodiment of the present invention. The terminal device 10 includes a user input unit 101, a session key generation unit 102, a session key conversion unit 103, an infrared transmission processing unit 104, a network transmission processing unit 105, a content request processing unit 106, a network reception processing unit 107, and a display processing unit 108. A display unit 109, an infrared transmission unit 110, a network transmission / reception unit 111, a reception confirmation key generation unit 112, a reception confirmation key conversion unit 113, an infrared reception unit 114, and an infrared reception processing unit 115.

  The user input unit 101 is an interface that receives an operation input from a user. For example, a cursor key for selecting a menu or a command on the display screen (display unit 109) or a button assigned to a command for a specific purpose Etc. As the contents of the operation input from the user, the operation input for starting the acquisition of the content by transmitting infrared rays from the infrared transmission unit 110, the operation input for accessing the URL received from the reference device 30 and requesting the content are distributed. There is an operation input for changing the display state such as displaying the content on the display screen and scrolling the displayed content. When an operation input for infrared transmission is performed, a session key generation command is output to the session key generation unit 102 and a reception verification key K1 generation command is output to the reception confirmation key generation unit 112. When a content request operation input is performed, a content request command is output to the content request processing unit 106.

Session key generation unit 102 generates session keys SK1 and SK2 and outputs them to session key conversion unit 103. The session key generation method is set in advance as to which of the above-described method using the random numbers (1) to (3), the method using the hash function, and the method using encryption. The unit 102 generates a session key according to the set algorithm.
Session key conversion unit 103 converts the session key generated by session key generation unit 102 into the data format of data transmitted from infrared transmission unit 110 or network transmission / reception unit 111, and transmits the converted session key SK1 by infrared transmission. The converted session key SK2 is output to the processing unit 104 to the network transmission processing unit 105, respectively.

The infrared transmission processing unit 104 performs processing such as data modulation used for infrared communication on the input session key SK1 and reception confirmation key K1, and transmits the processed session key SK1 and reception confirmation key K1 to the infrared transmission unit. 110 to the target device 20.
The URL acquired from the reference device 30 from the network reception processing unit 107 is input to the content request processing unit 106. In accordance with this URL, the content request processing unit 106 generates content acquisition request data for requesting the content storage device 40 corresponding to the URL to deliver the target content, and performs the network transmission processing on the generated content acquisition request data. Output to the unit 105.

  The network transmission processing unit 105 receives the session key SK2 input from the session key conversion unit 103, the reception confirmation key K1 input from the reception confirmation key conversion unit 113, and the content acquisition request input from the content request processing unit 106. Data is converted into data of a predetermined communication protocol. For example, when the terminal device 10 and the reference device 30 or the content storage device 40 are connected by a wireless LAN and TCP / IP (Transmission Control Protocol / Internet Protocol) is used as a communication protocol, the input data packet And adding headers. The converted data is transmitted to the network transmission / reception unit 111, the session key SK2 is transmitted from the network transmission / reception unit 111 to the reference device 30, and the content acquisition request data is transmitted to the corresponding content storage device 40. The network transmission processing unit 105 also transmits address data on the network of the terminal device 10 from the network transmission / reception unit 111 to the reference device 30.

In addition to transmitting the above data, the network transmission / reception unit 111 receives data transmitted from the reference device 30 and the content storage device 40, and outputs the received data to the network reception processing unit 107. The data from the reference device 30 is URL data indicating the storage location of the content related to the content distribution request, and the data from the content storage device 40 is the content to be distributed.
The network reception processing unit 107 performs processing such as header removal and packetized data reconstruction on the data input from the network transmission / reception unit 111. Among the processed data, the URL data from the reference device 30 is sent to the content request processing unit 106 and the display processing unit 108, and the content from the content storage device 40 is output to the display processing unit 108.

The display processing unit 108 performs processing for causing the display unit 109 to display input URL data, content, and reception notification of target device reception confirmation data. For example, if the content is encoded image data, it is decoded and output to the display unit 109, and if it is character data, it is output to the display unit 109 as character data.
The display unit 109 is a display device that displays data input from the display processing unit 108, and includes a liquid crystal panel or the like. In the present embodiment, when the reception confirmation key K1 is received from the target apparatus 10, the display unit 109 is used as a notification unit for notifying that the reception confirmation key K1 has been received. However, the present invention is not limited to this. It is not a thing. For example, when audio data is included in the content to be distributed, an audio processing unit or speaker for reproducing audio data may be provided instead of the display unit 109, or the audio processing unit or speaker may be provided as a display unit. 109 may be provided.

The reception confirmation key generation unit 112 generates a reception confirmation key K1 and outputs the reception confirmation key K1 to the reception confirmation key conversion unit 113. As a method for generating the reception confirmation key K1, the same method as the above-described method for generating the session key (1) to (4) can be used.
The reception confirmation key conversion unit 113 converts the reception confirmation key K1 generated by the reception confirmation key generation unit 112 into a data format of data transmitted from the infrared transmission unit 110 or the network transmission / reception unit 111, and is converted. The reception confirmation key K1 is output to the infrared transmission processing unit 104 and the network transmission processing unit 105, respectively.

FIG. 3 is an external view of the terminal device 10 according to the first embodiment of the present invention. A display unit 109 and a user input unit 101 are provided on the front surface of the terminal device 10, and an infrared transmission unit 110, an infrared reception unit 114, and a network transmission / reception unit 111 are provided on the top surface.
Although not shown in detail in the user input unit 101, an infrared transmission button operated at the start of content acquisition, a content request button operated at the start of content distribution from the content storage device 40, menu selection and distributed content Up / down / left / right cursor keys to be operated for browsing / scrolling are arranged. The network transmission / reception unit 111 is configured as a wireless antenna. When the user presses the infrared transmission button to transmit the session key SK1 and the reception confirmation key K1 to the target device 20 to receive the target device reception confirmation data, the surface on which the infrared transmission unit 110 is provided is targeted. The operation is performed in the direction of the device 20.

  FIG. 4 is a block diagram showing the configuration of the target device 20 of the content distribution system according to the first embodiment of the present invention. The target device 20 includes an infrared reception unit 201, an infrared reception processing unit 202, a data generation unit 203, a spot database 204, a state management unit 205, a network transmission processing unit 206, an output processing unit 207, an image display unit 208, and a network reception processing unit. 209, an infrared transmission processing unit 210, an infrared transmission unit 211, a target device reception confirmation data generation unit 212, and a spot ID storage unit 213.

The session key SK1 and the reception confirmation key K1 transmitted from the terminal device 10 by infrared are received by the infrared receiving unit 201, and predetermined processing such as data demodulation is performed by the infrared receiving processing unit 202, and the session key SK1 is data. The reception confirmation key K1 is input to the generation unit 203 and the target device reception confirmation data generation unit 212, respectively.
The data generation unit 203 refers to the received session key SK1, the context ID input from the state management unit 205, and the spot ID stored in the spot ID storage unit 213 (ID unique to the target device 20). Transmission data to be transmitted to the device 30 is generated and output to the network transmission processing unit 206.

The network transmission processing unit 206 converts the input transmission data into a predetermined communication protocol, and transmits the converted transmission data to the reference device 30. For example, when TCP / IP is used as a communication protocol, input data is packetized and a header is added.
In the spot database 204, context data that is data to be displayed on the image display unit 208 and a context ID that designates the context data are stored in association with each other. By preparing a plurality of context data, a large amount of data can be switched and displayed on one target device 20.

  FIG. 5 is a diagram showing an example of a spot database stored in the spot database 204 according to the first embodiment of the present invention. In FIG. 5, for example, Context-A, which is context data, is assigned 1 as a context ID. Each context data has a predetermined condition for displaying the context data. This condition includes, for example, day of the week, weather, temperature, and the like. That is, the display of the image data (context data) displayed on the image display unit 208 can be switched according to the day of the week, the weather, and the temperature.

  Returning to FIG. 4, the state management unit 205 manages switching of context data to be displayed on the image display unit 208. Specifically, the state management unit 205 selects and reads context data from the spot database 204 according to the above conditions. Then, the read context data is output to the output processing unit 207 (display on the image display unit 208 is performed), and the context ID corresponding to the read context data is output to the data generation unit 203. Since different context data is selected under different conditions, the display of the image display unit 208 is switched accordingly. Further, the context ID input to the data generation unit 203, that is, the context ID transmitted to the reference device 30 indicates the current state of the target device 20 (display content of the image display unit 208).

The output processing unit 207 performs processing for displaying the context data input from the state management unit 205 on the image display unit 208. The image display unit 208 is a display device that displays context data, and includes a liquid crystal panel, a plasma display panel, or the like.
The network reception processing unit 209 performs reception confirmation by performing processing such as header removal and packetized data reconstruction on the reference device reception confirmation data input from the reference device 30. The reception confirmation key K1 is output to the infrared transmission processing unit 210.

The infrared transmission processing unit 210 performs processing such as data modulation used in infrared communication on the reception confirmation key K1 input from the target device reception confirmation data generation unit 212, and targets the processed reception confirmation key K1. The data is transmitted from the infrared transmission unit 211 to the terminal device as device reception confirmation data. When the reception confirmation key K1 is input from the network reception processing unit 209, the output of the target device reception confirmation data of the corresponding reception confirmation key K1 is terminated.
The target device reception confirmation data generation unit 212 generates transmission data to be transmitted to the terminal device from the received reception confirmation key K1 and outputs the transmission data to the infrared transmission processing unit 210.

  6A and 6B are external views of the target device 20 and the like according to the first embodiment of the present invention. FIG. 6A is an example of the flat display type target device 20, and an infrared receiving unit 201 and an infrared transmitting unit 211 are installed on the upper part of the image display unit 208. A user M having the terminal device 10 operates the terminal device 10 toward the infrared receiving unit 201. The infrared transmission unit 211 transmits the target device reception confirmation data for notifying the user M that the data has been received by the infrared reception unit 201 toward the surroundings as infrared data.

  FIG. 6B is an example of the target device 20 that does not have the image display unit 208. The main body of the target device 20 is incorporated in, for example, a pedestal 51 on which the exhibit 50 is placed, and an infrared receiving unit 201 and an infrared transmitting unit 211 similar to those in FIG. 6A are installed on the pedestal 51. . If there is no image display unit 208, the context data and context ID are not used. Therefore, the target device 20 in FIG. 6B does not include the spot database 204, and the data generation unit 203 has a session key SK1 and a spot ID (which is a unique ID of the target device and corresponds one-to-one with the exhibit 50). To the reference device 30 is generated.

  FIG. 7 is a diagram illustrating an example of a screen display in the image display unit 208 of the target device 20 in FIG. The image display unit 208 of the target device 20 is divided into a moving image display area 2081, a still image display area 2082, a telop display area 2083, a web content display area 2084, and the like. The display of each of these areas is switched depending on which of the context data in the spot database 204 is used.

  FIG. 8 is a block diagram showing the configuration of the reference device 30 of the content distribution system according to the first embodiment of the present invention. The reference device 30 includes a network reception processing unit 301, a network transmission processing unit 302, a session key management unit 303, a content determination unit 304, a session key database 305, and a content database 306.

  The network reception processing unit 301 receives transmission data from the target device 20 including the session key SK1, the spot ID, and the context ID, and outputs the transmission data to the session key management unit 303. Further, it receives the session key SK2, the reception confirmation key K1, and the address of the terminal device 10 transmitted from the terminal device 10, and outputs the session key SK2 and the reception confirmation key K1 to the session key management unit 303, The address of the terminal device 10 is output to the content determination unit 304.

  The session key management unit 303 records the session key SK1, the spot ID, and the context ID included in the received transmission data in the session key database 305 in association with each other. When the session key SK2 is received and input from the network reception processing unit 301, the session key SK1 is compared with the session key SK1 in the session key database 305, and the input session key SK2 and each session key SK1 It is determined whether or not there is a relationship (a relationship in which the session keys SK1 and SK2 are the same in this embodiment). If the session key SK1 in the session key database 305 has the predetermined relationship, the spot ID and the context ID corresponding to the session key SK1 are output to the content determination unit 304, and the reception confirmation key K1 Is output to the network transmission processing unit 302.

  FIG. 9 is a diagram showing an example of a session key database stored in the session key database 305 according to the first embodiment of the present invention. In the session key database, a session key, a spot ID, a context ID, and an upd are stored in association with each other. As upd, the time when data is received from the target device 20 is recorded. In FIG. 9, for example, data in the first row is data relating to a content distribution request made in a state where an image display corresponding to context ID = 0 is being performed in the target device having spot ID = 1, and the terminal device 10 indicates that the session key transmitted from SK1 = fa03948591fcb629a124d0s6cba1962e729ca7b01 and the time when the data was received is 2006-06-05 15:22:35 (06:05, 15:22:35) ing.

Returning to FIG. 8, in the content database 306, for each content specified by the spot ID and the context ID, a URL indicating a location on the network 60 where the content is stored as data for acquiring the content. Is stored.
The content determination unit 304 reads the URL corresponding to the spot ID and context ID input from the session key management unit 303 from the content database 306, and reads the URL and the address of the terminal device 10 input from the network reception processing unit 301. Are output to the network transmission processing unit 302.
The network transmission processing unit 302 transmits the input URL to the terminal device 10 having the above address, and transmits the input reception confirmation key K1 to the target device 20 as reference device reception confirmation data.

FIG. 10 is a diagram showing an example of a database stored in the content database 306 according to the first embodiment of the present invention. The content database 306 stores a spot ID, a context ID, and data for acquiring content in association with each other.
In FIG. 10, for example, the URL of the location on the network 60 where the content corresponding to the spot ID = 1 and the context ID = 1 is stored is http: // example. com / i /. Also, here, the target device with spot ID = 1 has four context IDs, the target device with spot ID = 2 has one context ID, and the target device with spot ID = 3 has five context IDs. The case where it has is shown.

  FIG. 11 is a block diagram showing the configuration of the content storage device 40 of the content distribution system according to the first embodiment of the present invention. The content storage device 40 includes a network reception processing unit 401, a content processing unit 402, a content database 403, and a network transmission processing unit 404.

  The network reception processing unit 401 receives the content acquisition request data transmitted from the terminal device 10 and outputs it to the content processing unit 402. The content processing unit 402 reads the content corresponding to the URL specified by the content acquisition request data from the content database 403 and outputs it to the network transmission processing unit 404. The network transmission processing unit 404 transmits the content to the terminal device 10 that is the content request source. The content database 403 stores content corresponding to each URL.

FIG. 12 is a sequence diagram showing processing of the content distribution system according to the first embodiment of the present invention. FIGS. 13A to 13F are diagrams illustrating examples of images displayed on the display unit 109 of the terminal device during the processing according to the sequence diagram of FIG.
The content distribution system 100 a starts its operation when the user presses the infrared transmission button of the terminal device 10. For example, when the user desires content related to the image data displayed on the image display unit 208 of the target device 20, the user goes near the target device 20 and sets the infrared transmission unit 110 of the terminal device 10 to the target device. The infrared transmission button is pressed toward 20. At this time, an initial screen on which a message “Please press the button” appears as shown in FIG. 13A on the display unit 109 of the terminal device 10.

When the terminal device 10 receives an operation input from the user by pressing the infrared transmission button, the terminal device 10 generates session keys SK1 and SK2 (step S101). On the other hand, a reception confirmation key K1 is generated (step S113). Then, the session key SK1 and the reception confirmation key K1 are transmitted from the infrared transmission unit 110 to the target device 20 (step S102). At this time, a screen having a message “session key is being sent” is displayed on the display unit 109 of the terminal device 10 as shown in FIG.
The target device 20 that has received the session key SK1 and the reception confirmation key K1 displays the received session key SK1, the spot ID stored in the spot ID storage unit 213, and the image display unit 208 when receiving the session key. The context ID corresponding to the context data that has been transmitted is transmitted to the reference device 30 (step S103), and transmission of the target device reception confirmation data to the terminal device 10 is started (steps 114 and 115).
In this embodiment, the session key SK1 and the reception confirmation key K1 are transmitted from the terminal device 10 to the target device 20 in step S102, and the target device reception confirmation data is transmitted from the target device 20 to the terminal device in step S115. However, the present invention is not limited to such a configuration. For example, in step S102, the session key SK1 is transmitted from the terminal device 10 to the target device 20 without transmitting the reception confirmation key K1, or in step S115, the session key SK1 or the session key SK1 or The reception confirmation key K1 may be transmitted from the target device 20 to the terminal device 10.
In addition, when the target device 20 does not include the image display unit 208 as illustrated in FIG. 6B, the context ID is not transmitted from the target device 20 to the reference device 30.

  When the terminal device 10 receives the target device reception confirmation data from the target device 20 and confirms that the reception data includes the reception confirmation key K1 transmitted by the terminal device 10 (step 116), the terminal device 10 asks the user. On the other hand, the display unit 109 of the terminal device 10 outputs that the target device reception confirmation data has been received from the target device 20 (step 117), and the session key SK2, the reception confirmation key K1, and the terminal device 10 The address is transmitted from the network transmitting / receiving unit 111 to the reference device 30 (step 105). At this time, a screen having a message “infrared transmission complete” is displayed on the display unit 109 of the terminal device 10 as shown in FIG.

  The reference device 30 receives the session key SK1, spot ID, and context ID from the target device 20, and records the received session key SK1, spot ID, and context ID in the session key database 305 in association with each other (step S104). Further, the session key SK2, the reception confirmation key K1, and the address of the terminal device 10 transmitted from the terminal device 10 are received, and the received session key SK2 is stored in the session key database 305 in step S104. Check with SK1. As a result of the collation, when a session key SK1 having a predetermined relationship with the session key SK2 (in this embodiment, the relationship that the session keys SK1 and SK2 are the same) is obtained, the spot ID and context corresponding to the session key SK1 are obtained. The ID is read from the session key database 305 (step S106). The reception confirmation key K1 received together with the session key SK2 is included in the reference device reception confirmation data and transmitted to the target device 20 (step S118).

The reference device 30 further reads out the URL corresponding to the extracted spot ID and context ID from the content database 306 by searching (step S107), and transmits the read URL to the terminal device 10 at the address received in step S105. (Step S108).
The target device 20 receives the reference device reception confirmation data transmitted from the reference device 30 (step 118), and includes the data associated with the reception confirmation key K1 included in the received data. Is terminated (step 119). The target device may transmit the reference device reception confirmation data received from the reference device 30 in step S118 to the terminal device 10.

  The terminal device 10 receives the URL transmitted from the reference device 30 and displays a content access screen as shown in FIG. 13D on the display unit 109 (step S109). The content access screen includes the received URL, a message for confirming the user “Do you want to acquire content?”, Selection icons for “Yes” and “No”, and the like. Here, a case will be described in which “Yes” confirmation input is performed by the user using the cursor key of the user input unit 101 or the content request button.

Upon receiving the user input, the terminal device 10 transmits content acquisition request data to the content storage device 40 corresponding to the URL received in step S108 (step S110). At this time, the display unit 109 of the terminal device 10 displays a screen having a message “Content Accessing” as shown in FIG.
The content storage device 40 that has received the content acquisition request data reads the content corresponding to the URL specified by the received content acquisition request data from the content database 403 and transmits it to the terminal device 10 (step S111).
The terminal device 10 receives the content transmitted from the content storage device 40, and displays the received content on the display unit 109 as shown in FIG. 13F (step S112).
In this way, the distribution of the content from the content storage device 40 to the terminal device 10 is completed, and the operation of the content distribution system 100a ends.

FIGS. 14A to 14G are diagrams for explaining processing in the transmission queue of the target device reception confirmation data of the target device 20. These figures show the transmission procedure in the target device 20 when the reference device reception confirmation data is transmitted using infrared rays to a plurality of terminal devices, and the target device reception confirmation data of the target device 20 is temporarily stored. The operation of the transmission queue to be stored is shown as an example.
Here, U1, U2, U3, and U4 indicate target device reception confirmation data to be transmitted to each of the four terminal devices 10 (terminal devices 10a, 10b, 10c, and 10d). The transmission times t and n are set such that t = 1, n = 0.5, for example, indicating the number of seconds set in advance in the target apparatus.

  First, as illustrated in FIG. 14A, when the target device receives the reception confirmation key K1 from the terminal device 10, the target device transmits the target device reception confirmation data to be transmitted to each terminal device as a pair with the transmission time. Set in the queue. Here, the reception confirmation key K1 is received in the order of the terminal device 10a, the terminal device 10b, and the terminal device 10c, and the target device reception confirmation data U1, U2, and U3 for each terminal device are set in the queue.

  Next, as shown in FIG. 14B, the target device reception confirmation data U1 is continuously transmitted to the terminal device 10a for t seconds.

  Next, as illustrated in FIG. 14C, when the terminal device 10a fails to receive the target device reception confirmation data within a predetermined time, the transmission time t of the target device reception confirmation data U1 is set to n seconds. In addition, it is set at the end of the queue. At this time, whether or not the terminal device 10a has received the target device reception confirmation data U1 can be confirmed by whether or not the reference device reception confirmation data including the corresponding reception confirmation key K1 has been received from the reference device 30. .

  Next, as illustrated in FIG. 14D, the target device reception confirmation data U2 is continuously transmitted for t seconds toward the terminal device 10b. Here, a reception confirmation key K1 is newly received from the terminal device 10d.

  Next, as illustrated in FIG. 14E, when the terminal device 10b receives the target device reception confirmation data U2, the terminal device 10b deletes the target device reception confirmation data U2 from the queue. Then, the target device reception confirmation data U3 is continuously transmitted to the terminal device 10c for t seconds.

  Next, as shown in FIG. 14 (F), in the same way as in FIG. 14 (C), if the terminal device 10c fails to receive the target device reception confirmation data U3 within a predetermined time, the target device reception confirmation is performed. N seconds is added to the transmission time t of the business data U3 and set at the end of the queue. Then, the target device reception confirmation data U1 is continuously transmitted to the terminal device 10a for t + n seconds.

  Next, as shown in FIG. 14G, when the terminal device 10a fails to receive the target device reception confirmation data for a predetermined time, the transmission time t + n of the target device reception confirmation data U1 is set to n seconds. In addition, it is set again at the end of the queue.

If the timeout is repeated a certain number of times, for example, three times, the terminal device 10 deletes the target device reception confirmation data from the queue even if it has not received the data.
With the above processing, when the target device reception confirmation data is transmitted from the target device 20 to the plurality of terminal devices 10, the terminal device 10 is less likely to miss the target device reception confirmation data.

(Second Embodiment)
FIG. 15 is a configuration diagram showing an outline of a content distribution system 100b according to the second embodiment of the present invention. The second embodiment is different from the first embodiment (see FIG. 1) in that the content device 40 (40a, 40b, 40c) is not connected to the terminal device 10 via the network 60. The content device 40 is directly connected to the reference device 30. Here, the reference device 30 and the content distribution device 40 are collectively referred to as a content distribution device.
The configurations of the terminal device 10, the target device 20, the reference device 30, and the content storage device 40 are substantially the same as those in the first embodiment, but the reference device 30 has a predetermined relationship between the session key SK1 and the session key SK2. When the reference device 30 determines that the content is acquired, the reference device 30 does not transmit data (URL or the like) for acquiring the content to the terminal device 10, but based on the data for the reference device 30 to acquire the content. The point of difference is that the content is read from the content storage device 40 and transmitted to the terminal device 10.

  The terminal device 10 according to the second embodiment of the present invention generates a session key SK1 and a session key generation unit 102 (first session key generation) that generates a session key SK2 having a predetermined relationship with the session key SK1. And a second session key generation unit), a reception confirmation key generation unit 112 that generates a reception confirmation key K1 for confirming whether or not the session key SK1 is received by the target device 20, and the session key SK1 And the reception confirmation key K1 to the target device 20, the infrared transmission unit 110 (first transmission unit), and when the reception confirmation key K1 is received from the target device 20, the session key K1 is , A network to be transmitted to the content distribution device comprising the reference device 30 and the content storage device 40. Click transceiver 111 and a (second transmitting unit).

  The target device 20 according to the second embodiment of the present invention includes a spot ID storage unit 213 (target device identification data storage unit) that stores in advance target device identification data for identifying the target device 20, and the terminal device 10. When the session key SK1 and the reception confirmation key K1 are received, the session key SK1 and the target device identification data stored in the spot ID storage unit 213 are transmitted to the content distribution device and received. An infrared transmission unit 211 (third transmission unit, fourth transmission unit) that continuously transmits the confirmation key K1 to the terminal device 10 is provided.

In addition, the content distribution device including the reference device 30 and the content storage device 40 according to the second embodiment of the present invention includes a content database 306 (content storage unit) that stores target device identification data and content in association with each other in advance. ,
A session key management unit 303 (determination unit) that determines whether or not the session key SK1 transmitted from the target device 20 and the session key SK2 transmitted from the terminal device 10 have a predetermined relationship;
Receiving confirmation indicating that the session key SK1 and the session key SK2 have a predetermined relationship when the session key management unit 303 determines that the session key SK1 and the session key SK2 have a predetermined relationship Data is transmitted from the reference device 30 to the target device 20, and content corresponding to the target device identification data transmitted from the target device 20 is read from the content database 403 (content storage unit) and the terminal device And a network transmission processing unit 404 (content distribution unit) for distribution to the network 10.
The infrared transmission unit 211 continuously transmits the reception confirmation key K1 to the terminal device 10 when the target device 20 receives the reception confirmation data from the network transmission processing unit 404. Stop.

  As described above, according to the first or second embodiment of the present invention, the terminal device 10 generates the two session keys SK1 and SK2, and refers to one of the session keys SK1 via the target device 20. The other session key SK2 is directly transmitted to the reference device 30 and the session key sent by the reference device 30 through two different paths is collated. The session keys SK1 and SK2 are generated using random numbers, hash functions, or encryption so that the unique data of the terminal device 10 is not included, and only the address as the unique data of the terminal device 10 is directly transmitted to the reference device 30. . Similarly, the reception confirmation key K1 transmitted to acquire the target device reception confirmation data from the target device 20 is generated so that the unique data of the terminal device 10 is not included. Therefore, the specific data of the terminal device 10 is not acquired by the target device 20, and the security of the terminal device 10 can be protected.

  In addition, when the target device 20 transmits the spot ID and the context ID to the reference device 30 and the session key can be verified, the URL corresponding to the spot ID and the context ID is transmitted to the terminal device 10. The terminal device 10 acquires content corresponding to the URL from the content storage device 40. The context ID is associated with the state of the target device 20, and by using this, different contents can be distributed for each state of the target device 20.

  Further, in the communication between the terminal device 10 and the target device 20, only the session key SK1 and the reception confirmation key K1 are transmitted from the terminal device 10 and the reception confirmation key K1 is received. Therefore, the communication process is simplified. The content distribution request can be made in a short time, and the configuration of the transmission / reception unit can be simplified.

According to the content distribution system according to the first or second embodiment of the present invention, the first session key is transmitted to the reference device 30 via the target device 20, and the second session key is directly transmitted to the reference device 30. Since the content is distributed to the terminal device 10 when these two session keys can be collated by the reference device 30, the content can be distributed even if the unique data of the terminal device 10 is not included in the first session key. be able to.
Similarly, the reception confirmation key K1 transmitted to acquire the target device reception confirmation data from the target device 20 is generated so as not to include the unique data of the terminal device 10. Therefore, since it is not necessary to include the unique data of the terminal device 10 in the first session key to be sent to the target device 20, it is possible to prevent the unique data of the terminal device 10 from being obtained by a third party, thereby protecting the security. It is possible.
Furthermore, when the target device 20 transmits the target device reception confirmation data to the terminal device 10, the user can know that the request from the terminal device can be transmitted to the target device 20 without being known to a third party. It is possible to grasp.

As described above, the first and second embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the above-described one, and the scope of the present invention is not deviated. Various design changes can be made.
For example, in the first or second embodiment of the present invention described above, the case where a URL is used as “data for acquiring content” has been described. However, if the content can be specified, other than the URL May be used. As an example of “data for acquiring content” other than the URL, an IP (Internet Protocol) address, a file name, pointer data set uniquely, and the like can be used.

In addition, the target device 20 in the first or second embodiment of the present invention is not limited to the one provided with the image display unit 208, and as illustrated in FIG. It is good also as the object apparatus 20 which is installed near the display of this, and an advertisement thing, and does not display an image by itself.
Further, in addition to displaying the distributed content on the display unit 109, the terminal device 10 may store the content in a built-in memory or send the content to a home server device via a network for storage. Or you may. Further, the distributed content may be reproduced as audio content from a speaker or the like newly provided in the terminal device 10.

Further, communication is performed between the terminal device 10 and the reference device 30, the target device 20 and the reference device 30, the terminal device 10 and the content storage device 40, and the reference device 30 and the content storage device 40 by a communication function that can be used by the computer. The type of communication function does not matter. For example, a wired connection such as Ethernet (registered trademark), RS-232C (Recommended Standard 232C), USB (Universal Serial Bus), IEEE 1394 (Institute of Electrical and Electronics Engineers 1394), IEEE 802.11a / b / g, Wireless connections such as mobile phone communication, infrared communication, Bluetooth, optical transmission, etc. may be used.
In addition, although each said communication function can be used also for communication between the terminal device 10 and the object apparatus 20, it is suitable if infrared communication, Bluetooth, and optical transmission are used especially.

  In addition, the output processing when the terminal device 10 receives the target device reception confirmation data corresponding to itself from the target device 20 has been described here. However, the method is not limited to this method. For example, the user may be notified using vibration by a vibrator or the like, lighting of a lamp, sound, or the like. Moreover, you may continue a process automatically, without notifying a user.

  In the first or second embodiment of the present invention described above, the user input unit 101, session key generation unit 102, session key conversion unit 103, infrared transmission processing unit 104, network transmission of the terminal device 10 of FIG. Processing unit 105, content request processing unit 106, network reception processing unit 107, display processing unit 108, display unit 109, infrared transmission unit 110, network transmission / reception unit 111, reception confirmation key generation unit 112, reception confirmation key conversion unit 113 , Infrared reception unit 114, infrared reception processing unit 115, infrared reception unit 201, infrared reception processing unit 202, data generation unit 203, spot database 204, state management unit 205, network transmission processing unit 206 of the target device 20 in FIG. , Output processing unit 207, image display unit 208, network reception processing unit 09, infrared transmission processing unit 210, infrared transmission unit 211, target device reception confirmation data generation unit 212, spot ID storage unit 213, network reception processing unit 301 of reference device 30 in FIG. 8, network transmission processing unit 302, session Functions of the key management unit 303, content determination unit 304, session key database 305, content database 306, network reception processing unit 401, content processing unit 402, content database 403, and network transmission processing unit 404 of the content storage device 40 of FIG. Alternatively, a program for realizing a part of these functions is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute a content distribution system. Temu 100a, may be subjected to control of 100b. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it is also assumed that a server that holds a program for a certain time, such as a volatile memory inside a computer system that serves as a server or client. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

It is a block diagram which shows the outline | summary of the content delivery system 100a by the 1st Embodiment of this invention. It is a block diagram which shows the structure of the terminal device 10 in the content delivery system by the 1st Embodiment of this invention. It is an external view of the terminal device 10 by the 1st Embodiment of this invention. It is a block diagram which shows the structure of the target apparatus 20 of the content delivery system by the 1st Embodiment of this invention. It is a figure which shows an example of the spot database memorize | stored in the spot database 204 by the 1st Embodiment of this invention. It is an external view of the object apparatus 20 grade | etc., By the 1st Embodiment of this invention. It is a figure which shows an example of the screen display in the image display part 208 of the target apparatus 20 of FIG. 6 (A). It is a block diagram which shows the structure of the reference apparatus 30 of the content delivery system by the 1st Embodiment of this invention. It is a figure which shows an example of the session key database memorize | stored in the session key database 305 by the 1st Embodiment of this invention. It is a figure which shows an example of the database memorize | stored in the content database 306 by the 1st Embodiment of this invention. It is a block diagram which shows the structure of the content storage apparatus 40 of the content delivery system by the 1st Embodiment of this invention. It is a sequence diagram which shows the process of the content delivery system by the 1st Embodiment of this invention. It is a figure which shows an example of the image displayed on the display part 109 of a terminal device at the time of the process by the sequence diagram of FIG. 6 is a diagram for explaining processing in a transmission queue of target device reception confirmation data of the target device 20. FIG. It is a block diagram which shows the outline | summary of the content delivery system 100b by the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Terminal device, 20 ... Target device, 30 ... Reference device, 40 ... Content storage device, 100a, 100b ... Content distribution system, 101 ... User input part, 102 ... Session key generation unit 103: Session key conversion unit 104: Infrared transmission processing unit 105: Network transmission processing unit 106: Content request processing unit 107: Network reception processing unit , 108 ... display processing unit, 109 ... display unit, 110 ... infrared transmission unit, 111 ... network transmission / reception unit, 112 ... key generation unit for reception confirmation, 113 ... for reception confirmation Key conversion unit 114... Infrared reception unit 115... Infrared reception processing unit 201... Infrared reception unit 202... Infrared reception processing unit 203. Data generation unit, 204 ... spot database, 205 ... state management unit, 206 ... network transmission processing unit, 207 ... output processing unit, 208 ... image display unit, 209 ... network reception Processing unit 210 ... Infrared transmission processing unit 211 ... Infrared transmission unit 212 ... Target device reception confirmation data generation unit 213 ... Spot ID storage unit 301 ... Network reception processing unit 302 ... Network transmission processing unit 303 ... Session key management unit 304 ... Content determination unit 305 ... Session key database 306 ... Content database 401 ... Network reception processing unit 402: Content processing unit 403: Content database 404: Network transmission processing Part

Claims (15)

In a content distribution system comprising a terminal device, a target device, and a content distribution device,
The terminal device
A first session key generation unit for generating a first session key;
A second session key generation unit for generating a second session key having a predetermined relationship with the first session key;
A reception confirmation key generating unit that generates a reception confirmation key for confirming whether or not the first session key is received by the target device;
A first transmitter that transmits the first session key and the reception confirmation key to the target device;
A second transmission unit that transmits the second session key to the content distribution device when the reception confirmation key is received from the target device;
The target device is:
A target device identification data storage unit that stores in advance target device identification data for identifying the target device;
When the first session key and the reception confirmation key are received from the terminal device, the content distribution includes the first session key and the target device identification data stored in the target device identification data storage unit. A third transmission unit for transmitting to the device and transmitting the reception confirmation key to the terminal device,
The content distribution device includes:
A content storage unit that stores the target device identification data and the content in association with each other;
A determination unit that determines whether or not the first session key transmitted from the target device and the second session key transmitted from the terminal device have a predetermined relationship;
When the determination unit determines that the first session key and the second session key have a predetermined relationship, content corresponding to the target device identification data transmitted from the target device is transmitted from the content storage unit. A content delivery unit that reads and delivers to the terminal device;
A content distribution system comprising: In a content distribution system comprising a terminal device, a target device, and a content distribution device,
The terminal device
A first session key generation unit for generating a first session key;
A second session key generation unit for generating a second session key having a predetermined relationship with the first session key;
A reception confirmation key generating unit that generates a reception confirmation key for confirming whether or not the first session key is received by the target device;
A first transmitter that transmits the first session key and the reception confirmation key to the target device;
A second transmission unit that transmits the second session key to the content distribution device when the reception confirmation key is received from the target device;
The target device is:
A target device identification data storage unit that stores in advance target device identification data for identifying the target device;
When the first session key and the reception confirmation key are received from the terminal device, the content distribution includes the first session key and the target device identification data stored in the target device identification data storage unit. A third transmitter for transmitting to the device and continuously transmitting the reception confirmation key to the terminal device;
The content distribution device includes:
A content storage unit that stores the target device identification data and the content in association with each other;
A determination unit that determines whether or not the first session key transmitted from the target device and the second session key transmitted from the terminal device have a predetermined relationship;
When the determination unit determines that the first session key and the second session key have a predetermined relationship, the first session key and the second session key have a predetermined relationship A content distribution unit that transmits reception confirmation data indicating the above to the target device, and reads content corresponding to the target device identification data transmitted from the target device from the content storage unit and distributes the content to the terminal device And
The third transmission unit stops continuous transmission of the reception confirmation key to the terminal device when the target device receives the reception confirmation data from the content distribution unit. Content distribution system.   The content delivery system according to claim 2, wherein the reception confirmation key generation unit generates data other than terminal device identification data for identifying the terminal device as the reception confirmation key.   The content delivery system according to claim 2, wherein the reception confirmation key generating unit generates the reception confirmation key including a random number.   3. The reception confirmation key generation unit generates the reception confirmation key based on data obtained by combining terminal device identification data for identifying the terminal device and a predetermined counter value. Content distribution system.   The content delivery according to claim 2, wherein the reception confirmation key generation unit generates the same key as the first session key generated by the first session key generation unit as the reception confirmation key. system. In the terminal device that communicates with the target device and the content distribution device,
A first session key generation unit for generating a first session key;
A second session key generation unit for generating a second session key having a predetermined relationship with the first session key;
A reception confirmation key generating unit that generates a reception confirmation key for confirming whether or not the first session key is received by the target device;
A first transmitter that transmits the first session key and the reception confirmation key to the target device;
A second transmission unit that transmits the second session key to the content distribution device when the reception confirmation key is received from the target device;
A terminal device comprising:   The terminal device according to claim 7, further comprising a notification unit that notifies that the reception confirmation key has been received when the reception confirmation key is received from the target device.   The terminal device according to claim 7 or 8, wherein the first transmission unit transmits the first session key and the reception confirmation key to the target device using wireless communication.   The terminal device according to claim 9, wherein the first transmission unit transmits the first session key and the reception confirmation key to the target device using infrared communication.   The terminal device according to claim 7, wherein the second transmission unit transmits the second session key to the content distribution device using wireless communication. In the target device that communicates with the terminal device and the content distribution device,
A target device identification data storage unit that stores in advance target device identification data for identifying the target device;
When the first session key and the reception confirmation key are received from the terminal device, the content distribution includes the first session key and the target device identification data stored in the target device identification data storage unit. A third transmitter for transmitting to the terminal and transmitting the reception confirmation key to the terminal device;
A target device comprising:   When reception confirmation data indicating that the first session key and the second session key have a predetermined relationship is received from the content distribution device, the reception confirmation data is sent to the terminal device. The target device according to claim 12, further comprising a fourth transmission unit for transmission. In a content distribution device that communicates with a terminal device and a target device,
A content storage unit for storing target device identification data for identifying each target device and content in association with each other;
A determination unit that determines whether or not the first session key transmitted from the target device and the second session key transmitted from the terminal device have a predetermined relationship;
When the determination unit determines that the first session key and the second session key have a predetermined relationship, the first session key and the second session key have a predetermined relationship A content distribution unit that transmits reception confirmation data indicating the above to the target device, and reads content corresponding to the target device identification data transmitted from the target device from the content storage unit and distributes the content to the terminal device When,
A content distribution apparatus comprising: In a content distribution method using a terminal device, a target device, and a content distribution device,
The terminal device
A first session key generation process for generating a first session key;
A second session key generating step of generating a second session key having a predetermined relationship with the first session key;
A reception confirmation key generating step for generating a reception confirmation key for confirming whether or not the first session key has been received by the target device;
A first transmission process of transmitting the first session key and the reception confirmation key to the target device;
A second transmission step of transmitting the second session key to the content distribution device when the reception confirmation key is received from the target device;
The target device is:
A target device identification data storage process for storing in advance target device identification data for identifying the target device;
When the first session key and the reception confirmation key are received from the terminal device, the first session key and the target device identification data stored in the target device identification data storage process are stored in the content distribution device. And performing a third transmission process of transmitting the reception confirmation key to the terminal device,
The content distribution device includes:
A content storage process for storing target device identification data and content in association with each other;
A determination process for determining whether or not the first session key transmitted from the target device and the second session key transmitted from the terminal device have a predetermined relationship;
When it is determined in the determination process that the first session key and the second session key have a predetermined relationship, content corresponding to target device identification data transmitted from the target device is read and the terminal device A content distribution method comprising: executing a content distribution process for distributing content to the content.

Images