JP2011170423A - Content transmission/reception system and operation method in content transmission/reception system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content transmission/reception system for facilitating countermeasures to such a case that content which should not be originally transmitted is transmitted. <P>SOLUTION: In a content transmitter 1, deletion object content which should not originally transmitted is selected. The content transmitter 1 selects transmission history information corresponding to the deletion object content. The content transmitter 1 transmits a deletion instruction including a content name in the selected transmission history information to a content receiver 2 (S105). The content receiver 2 retrieves and deletes the content having the content name in the deletion instruction (S109). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a content transmission / reception system and a method for operating in a content transmission / reception system that can cope with content that should not be transmitted, and a content reception device that should not be transmitted. The present invention relates to a content transmission / reception system and an operation method in the content transmission / reception system.

  Conventionally, in order to send and receive content (files that make up digital content) using a telephone number, content can be transmitted using TCP (HTTP, etc.) after call connection is completed using SIP call control. Send and receive.

  FIG. 14 is a diagram showing a schematic operation sequence example in a conventional content transmission / reception system.

  When content is selected in content transmission device 1A and dialing and transmission are instructed, content transmission device 1A makes a call by SIP to content reception device 2A. The content receiving device 2A makes a response by SIP. When the TCP session is established, the content transmission device 1A transmits a reception side capability notification request to the content reception device 2 (S1A). The content reception device 2A transmits a reception side capability notification response to the content transmission device 1 (S3A).

  In the reception side capability notification request, it is notified that notification of the capability of the receiving device is necessary. In the reception side capability notification response, the capability of the reception device is notified. The content transmission device 1A confirms whether the capability of the reception device is sufficient.

  If it is confirmed that the content transmission device 1A has sufficient capability (S11A), the content transmission device 1A and the content reception device 2A transmit and receive content (S15).

  Specifically, the content transmitting apparatus 1A notifies the file name and MIME-Type of the content, and when receiving the reception start, transmits the content in multiple times, for example. If the content reception device 2A transmits a transmission completion response and the content transmission device 1A disconnects the call by SIP, a series of processing ends.

JP 2003-345699 A JP 10-336233 A

  However, the conventional content transmission / reception system has the following problems.

  First, (1) the content transmitting apparatus 1 transmits content that should not be transmitted to the content receiving apparatus due to an operation mistake or the like, and the content, for example, content that should not be browsed is browsed. There is a risk of it.

  In addition, (2) the content transmitting apparatus 1 may transmit content to a content receiving apparatus that should not be transmitted due to an operation error or the like, and the content may be viewed by a person who should not browse. .

The present invention has been made in view of the above problems, and its object is to
(1) A content transmission / reception system capable of handling when content that should not be transmitted has been transmitted, an operation method in the content transmission / reception system, and
(2) To provide a content transmission / reception system and an operation method in the content transmission / reception system that can cope with transmission to a content reception apparatus that should not be transmitted.

  In order to solve the above-described problem, a first aspect of the present invention is a content transmission / reception system including a content transmission device that transmits content and a content reception device that receives content, wherein the content transmission device includes the content A transmission history information storage unit that stores transmission history information including the content name of the content transmitted from the transmission device, and a transmission that selects transmission history information corresponding to the content that should not be transmitted from the transmission history information storage unit A history information selection unit; and a deletion instruction transmission unit that transmits a deletion instruction including a content name in the selected transmission history information to the content reception device, wherein the content reception device transmits from the content transmission device. If the content storage unit that stores the received content and the delete instruction is transmitted, Content having the content name in the removal instruction and having a content deletion unit for deleting retrieved from the content storage unit.

  A second aspect of the present invention is a content transmission / reception system including a content transmission device for transmitting content and a content reception device for receiving content, wherein the content transmission device is encrypted and transmitted by the content transmission device. A transmission history information storage unit that stores transmission history information including a destination of the content that has been transmitted, and a key for decrypting the content transmitted to the destination for each destination of the content that is encrypted and transmitted by the content transmission device The key transmission destination information storage unit for storing the key transmission destination information indicating the transmission destination at the time of transmission without passing through the content reception device that receives the content, and the content to be transmitted from the content transmission device A content encryption unit for encrypting and transmitting the encrypted content to the content receiving device A key for searching the content transmission unit and the key transmission destination information corresponding to the destination of the content from the key transmission destination information storage unit, and transmitting the key for decrypting the content to the transmission destination indicated by the transmission destination information And a transmission unit.

  A third aspect of the present invention is a content transmission / reception system including a content transmission device for transmitting content and a content reception device for receiving content, wherein the content transmission device is a content of content transmitted from the content transmission device A transmission history information storage unit that stores transmission history information including a name and a destination of the content, and for each content destination encrypted and transmitted by the content transmission device, decrypts the content transmitted to the destination A key transmission destination information storage unit for storing a key transmission destination information indicating a transmission destination at the time of transmission without passing through a content receiving device that receives the content, and a transmission history information storage unit. A transmission history information selection unit for selecting transmission history information corresponding to content that should not have been, and the selected A deletion instruction transmission unit that transmits a deletion instruction including the content name in the transmission history information to the content reception device, a content encryption unit that encrypts content to be transmitted from the content transmission device, and the content transmission A content transmission unit that transmits the content to be transmitted from the device or the encrypted content to the content reception device, and key transmission destination information corresponding to the destination of the content from the key transmission destination information storage unit; A content transmission unit that stores a content transmitted from the content transmission device, the key transmission unit configured to transmit a key for decrypting the content to a transmission destination indicated by the transmission destination information If the delete instruction is transmitted, the content name in the delete instruction is included. And having a content deletion unit for deleting the content retrieved from the content storage unit.

  A fourth aspect of the present invention is an operation method performed by a content transmission / reception system including a content transmission device that transmits content and a content reception device that receives content, wherein the content transmission device is transmitted from the content transmission device. A transmission history information storage unit that stores transmission history information including a content name of the content, and the content reception device includes a content storage unit that stores content transmitted from the content transmission device, and the operation method The transmission history information selection unit of the content transmission device selects the transmission history information corresponding to the content that should not have been transmitted from the transmission history information storage unit, and the deletion instruction transmission unit of the content transmission device A delete instruction including the content name in the selected transmission history information. A step of transmitting to the content receiving device and a content deleting unit of the content receiving device, if the delete instruction is transmitted, searches the content storage unit for the content having the content name in the delete instruction and deletes it And a step.

  A fifth aspect of the present invention is an operation method performed by a content transmission / reception system including a content transmission device for transmitting content and a content reception device for receiving content, wherein the content transmission device is encrypted by the content transmission device Transmission history information storage unit for storing transmission history information including the destination of the transmitted content, and for each content destination encrypted and transmitted by the content transmitting device, the content transmitted to the destination is decrypted A key transmission destination information storage unit that stores key transmission destination information indicating a transmission destination when transmitting the key for transmission without going through the content reception device that receives the content, and the operation method includes: The content encryption unit of the content transmission device encrypts content to be transmitted from the content transmission device A step in which the content transmission unit of the content transmission device transmits the encrypted content to the content reception device, and a key transmission destination corresponding to the destination of the content by the key transmission unit of the content transmission device. A step of retrieving information from the key transmission destination information storage unit and transmitting a key for decrypting the content to a transmission destination indicated by the transmission destination information.

  For example, the content storage unit stores the content transmitted from the content transmission device with an alias, and the content reception device includes a content name of the content transmitted from the content transmission device and an alias of the content. A reception history information storage unit that stores the reception history information including the content history deletion unit, and the content deletion unit searches the reception history information storage unit for reception history information including the content name in the deletion instruction. The content having another name is retrieved from the content storage unit and deleted.

(1) According to the present invention, the content transmitted from the content transmitting device and stored in the content receiving device can be deleted from the content transmitting device. Can be deleted later, preventing browsing.

(2) According to the present invention, the content is encrypted and transmitted to the content receiving device, and the key for decrypting the content is transmitted without passing through the content receiving device so as to pass to the recipient who should originally browse the content. Therefore, even if content is transmitted to a content receiving device that should not be transmitted originally, the content receiving device cannot immediately decrypt the content, and content other than the recipient who should originally view the content Can be prevented from being browsed, and the key for decrypting the content is passed to the recipient who should originally browse the content, so that the recipient can browse the content.

It is a block diagram of the content transmission / reception system which concerns on this Embodiment. It is the table | surface which put together the solution method of the subject in this Embodiment. It is a block diagram which concerns on the specific example of the content transmitter 1 and the content receiver 2. FIG. 3 is a diagram illustrating a configuration of a transmission history information storage unit 11. FIG. 3 is a diagram illustrating a configuration of a key transmission destination information storage unit 12. FIG. 3 is a diagram illustrating a configuration of a reception history information storage unit 22. FIG. It is a figure which shows the 1st operation | movement sequence example which concerns on this Embodiment. It is a figure which shows some details of the 1st operation | movement sequence example which concerns on this Embodiment. It is a figure which shows the 2nd operation | movement sequence example which concerns on this Embodiment. It is a figure which shows the example of an operation | movement flowchart which concerns on the 1st operation | movement sequence example in the content transmission apparatus. FIG. 10 is a diagram illustrating an example of an operation flowchart according to a first operation sequence example in the content receiving device 2; It is a figure which shows the example of an operation | movement flowchart which concerns on the 2nd operation | movement sequence example in the content transmission apparatus. FIG. 10 is a diagram illustrating an example of an operation flowchart according to a second operation sequence example in the content reception device 2; It is a figure which shows the example of a rough operation | movement sequence in the conventional content transmission / reception system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a content transmission / reception system according to the present embodiment.
The content transmission / reception system includes a content transmission device (appropriately abbreviated as “transmission device”) 1 for transmitting content such as documents, photos, data, and the like, and a content reception device for receiving content (appropriately, “reception device” 2 and a similar content transmitting device and content receiving device (both not shown), which are connected via a communication network. A telephone number is assigned to each content transmission device 1 and content reception device 2. The content transmission device 1 makes a call by designating the content reception device 2 by a telephone number, thereby establishing a TCP session, and transmits the content to the content reception device 2 using this TCP session.

  The content transmission device 1 includes a transmission history information storage unit 11 that stores transmission history information including a content name of the content transmitted from the content transmission device 1 and a destination such as a recipient name of a recipient who originally browses the content; For each destination of content that is encrypted and transmitted by the content transmission apparatus 1, information for decrypting the content transmitted to the destination (so-called key, hereinafter referred to as "key") is received. Content transmission device 2 for encrypting the content to be transmitted from the content transmission device 1 and the key transmission destination information storage unit 12 for storing the transmission destination information indicating the transmission destination at the time of transmission. And the content to be transmitted from the content transmission device 1 or the encrypted content container. A key for decrypting the content by searching the key transmission destination information storage unit 12 for the key transmission destination information corresponding to the destination of the encrypted content. The key transmission unit 15 that transmits the message to the transmission destination indicated by the transmission destination information, the transmission history information selection unit 16 that selects the transmission history information corresponding to the content that should not be transmitted from the transmission history information storage unit 11, A deletion instruction transmission unit 17 that transmits a deletion instruction including the content name in the selected transmission history information to the content reception device 2.

  The content receiving device 2 includes a content storage unit 21 that stores the content transmitted from the content transmission device 1, a content name of the content transmitted from the content transmission device 1, and an alias that is a file name of the content in the content storage unit 21. When a deletion instruction is transmitted from the content transmission device 1 and the reception history information storage unit 22 that stores reception history information including the contents of the reception history information, the content storage unit 21 is searched for the content having the content name in the deletion instruction. And a content deletion unit 23 to be deleted.

FIG. 2 is a table summarizing the solution of the problem in the present embodiment.
Problem (1): With respect to “the content that should not be transmitted originally is transmitted”, the content transmitted from the content transmitting device and stored in the content receiving device can be deleted from the content transmitting device. As a result, even if content that should not be transmitted is transmitted, it can be deleted later and prevented from being viewed.

  Problem (2): For “content is transmitted to a content receiving device that should not be transmitted originally”, the content is encrypted and transmitted to the content receiving device, and the key for decrypting the content is the content receiving device The content is transmitted to the recipient who should originally browse the content without going through. As a result, even if the content is transmitted to the content receiving device that should not be transmitted, the content receiving device cannot immediately decrypt the content, and the content is not received by a person other than the recipient who should originally view the content. In addition to preventing browsing, the key for decrypting the content is passed to the recipient who should originally browse the content, so that the recipient can browse the content.

  FIG. 3 is a block diagram according to a specific example of the content transmission device 1 and the content reception device 2.

  The device according to the specific example includes, for example, a hard disk device (HDD) A1, an operating system (OS) A2, a memory A3, and a digital content transmission / reception application A4 in which content files are stored.

  The digital content transmission / reception application A4 includes a graphic user interface (GUI) 41, a transmission service function 42, a reception service function 43, a file management function 44, an HTTP (SOAP) protocol 45, a communication function (content transfer protocol) 46, an SMTP protocol, and the like. A protocol 47, an encryption function 48, and a key transmission function 49 are provided. The communication function 46 includes a transmission / reception device authentication function 461, a sender / receiver authentication function 462, and a file management function 463.

  The file management function 44 is a function for managing the transmission history information storage unit 11, the key transmission destination information storage unit 12, the content storage unit 21, the reception history information storage unit 22, and other files. The encryption function 48 exhibits the function of the content encryption unit 13. The key transmission function 49 uses the protocol 47 to demonstrate the function of the key transmission unit 15. The file management function 463 exhibits the function of the content deletion unit 23.

  FIG. 4 is a diagram illustrating a configuration of the transmission history information storage unit 11.

  The transmission history information storage unit 11 stores transmission history information for each content transmission date and time.

  Each transmission history information includes a corresponding transmission date and time, a telephone number (destination number) of the content receiving apparatus 2 that is a transmission destination of the transmitted content, a content name of the content, and a destination of the content. If the content is encrypted, the transmission history information includes an encryption flag indicating that.

  The content name is, for example, a file name. The destination is, for example, the recipient name of the recipient who should originally browse the content.

FIG. 5 is a diagram illustrating the configuration of the key transmission destination information storage unit 12.
The key transmission destination information storage unit 12 stores a key for each content destination (the original destination of the content, for example, the recipient name of the recipient who should originally browse the content) transmitted by being encrypted by the content transmission device 1. Store destination information. Each key transmission destination information indicates a key transmission destination and a key transmission method, and includes a destination (recipient name). When the key transmission method is electronic mail, the key transmission destination is an electronic mail address. On the other hand, when the key transmission method is FAX (facsimile), the key transmission destination is the line number of the telephone line to which the facsimile receiver is connected.

FIG. 6 is a diagram illustrating a configuration of the reception history information storage unit 22.
The reception history information storage unit 22 stores reception history information for each content reception date and time.

  Each reception history information includes a corresponding reception date and time, a telephone number (calling number) of the content transmission apparatus 1 that is a transmission source of the received content, a content name of the content, and a file name in the content storage unit 21 of the content. Includes aliases. The alias has, for example, a main part in which the reception date and time is a number.

FIG. 7 is a diagram showing a first operation sequence example according to the present embodiment.
When content is selected in the content transmission device 1 and a dialing and transmission instruction is given, the content transmission device 1 makes a call to the content reception device 2 by SIP. The content receiving device 2 makes a response by SIP. When the TCP session is established, the content transmission device 1 transmits a reception side capability notification request to the content reception device 2 (S1). The content reception device 2 transmits a reception side capability notification response to the content transmission device 1 (S3).

  The receiving side capability notification request requires notification of the capability of the receiving device, authentication of the receiving device is required (reception device authentication is required), and receiver authentication is required (recipient authentication is required) Will be notified.

  In the reception side capability notification response, it is notified that the capability of the reception device, the authentication of the transmission device is necessary (transmission device authentication is required), and the authentication of the sender is necessary (sender authentication is required).

The content transmission device 1 confirms whether the capability of the reception device is sufficient.
Next, transmission / reception apparatus authentication (S5) and transmission / reception person authentication (S7) are performed. These orders are unquestioned.

  It is confirmed that the capability is sufficient in the content transmitting apparatus 1 and that the authentication is successful, that is, that the other party is a party permitted to receive (S11), and that the authentication is successful in the content receiving apparatus 2. If it is confirmed that the partner is a partner permitted to transmit (S13), the content transmitting device 1 and the content receiving device 2 transmit and receive content (S15).

  Specifically, when the content transmission unit 14 of the content transmission device 1 notifies the file name of the content and MIME-Type and receives the reception start, the content transmission unit 14 divides the content into, for example, a plurality of times and sends it to the content reception device 2. Send. The content transmission unit 14 of the content transmission device 1 transmits content using, for example, HTTP (hypertext transfer protocol).

  The content transmission device 1 generates transmission history information including the transmission date and time, the telephone number (destination number) of the content reception device 2 that is the transmission destination of the transmitted content, the content name of the content, and the destination of the content, It is stored in the transmission history information storage unit 11 (S16).

  On the other hand, the content receiving device 2 stores the content in the content storage unit 21. Further, the content receiving device 2 uses the reception date and time, the telephone number (calling number) of the content transmission device 1 that is the transmission source of the received content, the content name of the content, and the file name in the content storage unit 21 of the content. Reception history information including a certain alias is generated and stored in the reception history information storage unit 22 (S17).

  Then, if the content receiving device 2 transmits a transmission completion response and the content transmitting device 1 disconnects the call by SIP, a series of processing ends. The content receiving device 2 reads the content from the content storage unit 21 as necessary, and performs printing or display.

  Here, it is assumed that the content transmitted in step S15 is content that should not have been originally transmitted. In this case, in step S18, processing for deleting the content is performed.

FIG. 8 is a diagram illustrating a detailed operation sequence example of step S18.
When the content transmission device 1 selects a content to be deleted that should not have been originally transmitted and issues an instruction for dialing and transmission of a deletion instruction, the content transmission device 1 calls the content reception device 2 using SIP. I do. The content receiving device 2 makes a response by SIP. When the TCP session is established, the content transmission device 1 transmits a reception side capability notification request to the content reception device 2 (S101). The content reception device 2 transmits a reception side capability notification response to the content transmission device 1 (S103).

  In the reception side capability notification request, a request to delete the transmitted content (request for deleting transmitted content) is notified.

  In the reception side capability notification response, deletion of transmitted content (sent content deletion response) is notified.

The content transmission device 1 confirms whether the capability of the reception device is sufficient.
The transmission history information selection unit 16 of the content transmission device 1 selects transmission history information corresponding to the content to be deleted from the transmission history information storage unit 11.

  Next, the deletion instruction transmission unit 17 of the content transmission device 1 transmits a deletion instruction including the content name in the selected transmission history information to the content reception device 2 (S105).

  The content receiving device 2 transmits a delete instruction reception indicating that the delete instruction has been received to the content transmitting device 1 (S107).

  Further, the content deleting unit 23 of the content receiving device 2 searches the content storage unit 21 for the content having the content name in the deletion instruction and deletes it (S109).

  Specifically, the content deletion unit 23 searches the reception history information storage unit 22 for reception history information including the content name in the deletion instruction, and searches the content storage unit 21 for content having an alias in the reception history information. And delete it.

  Then, if the content receiving apparatus 2 notifies the completion of deletion (S111), and the content transmitting apparatus 1 performs call disconnection by SIP (S113), a series of processing ends.

FIG. 9 is a diagram showing a second operation sequence example according to the present embodiment.
When content is selected in the content transmission device 1, a recipient who should originally browse the content, that is, a destination is selected, and when a dialing and transmission instruction is given, the content transmission device 1 instructs the content reception device 2 by SIP. Make a call. The content receiving device 2 makes a response by SIP. When the TCP session is established, the content transmission device 1 transmits a reception side capability notification request to the content reception device 2 (S51). The content reception device 2 transmits a reception side capability notification response to the content transmission device 1 (S53).

  Next, the content encryption unit 13 encrypts the content to be transmitted (S55).

  Next, the content transmission device 1 and the content reception device 2 transmit and receive content (S57). The transmission / reception of the content here is the same as the transmission / reception of the content in step S15 except that the content is encrypted.

  The content transmitting apparatus 1 generates the transmission history information including the encryption flag in the same manner as in the above step S16, and stores it in the transmission history information storage unit 11.

  In addition, the content receiving device 2 stores the content in the content storage unit 21. In addition, the content receiving device 2 generates reception history information and stores it in the reception history information storage unit 22 as in step S17.

  Then, the content receiving device 2 transmits a transmission completion response, and the content transmitting device 1 disconnects the call by SIP.

  Next, the key transmission unit 15 of the content transmission apparatus 1 searches the key transmission destination information storage unit 12 for key transmission destination information corresponding to the destination (recipient), and decrypts the encrypted content. Is transmitted to the key transmission destination indicated by the key transmission destination information by the key transmission method indicated by the key transmission destination (S59).

  For example, when the key transmission method is electronic mail and the key transmission destination is an electronic mail address, the key transmission unit 15 transmits the key to the address using an electronic mail protocol (such as SMTP).

  On the other hand, when the key transmission method is FAX (facsimile) and the transmission destination of the key is a line number, the key transmission unit 15 transmits the key to the line of the line number using a facsimile protocol.

  The recipient who should originally browse the content receives the key, and decrypts the content transmitted in step S57 using the key (S61).

  FIG. 10 is a diagram illustrating an example of an operation flowchart according to the first operation sequence example in the content transmission device 1.

  The transmission history information selection unit 16 of the content transmission apparatus 1 transmits a transmission corresponding to the content to be deleted that should not have been transmitted from the transmission history information storage unit 11 when the TCP session is established and the reception side capability notification is made. History information is selected (S201).

  Next, the deletion instruction transmission unit 17 of the content transmission apparatus 1 transmits a deletion instruction including the content name in the selected transmission history information to the content reception apparatus 2 (S203).

  Next, the content transmitting apparatus 1 receives a deletion instruction acceptance (S205).

  If the content transmission apparatus 1 has received the deletion instruction reception, the content transmission apparatus 1 receives the deletion completion (S207) and disconnects the call (S209).

  On the other hand, if the content transmission apparatus 1 has not received the deletion instruction acceptance, the content transmission apparatus 1 disconnects the call (S209).

  FIG. 11 is a diagram illustrating an example of an operation flowchart according to the first operation sequence example in the content receiving device 2.

  When the TCP session is established and the reception side capability notification is performed, the content reception device 2 receives the deletion instruction (S301).

  The content deletion unit 23 of the content receiving device 2 searches the content storage unit 21 for content having the content name in the deletion instruction (S303).

  If there is the corresponding content, the content receiving device 2 transmits a delete instruction acceptance to the content transmitting device 1 (S305).

Next, the content deletion unit 23 deletes the corresponding content (S307).
Next, the content reception device 2 notifies the content transmission device 1 of the completion of deletion (S309), and processes call disconnection (S311).

  On the other hand, if there is no corresponding content, the content receiving device 2 transmits a notification to that effect to the content transmitting device 1 (S313), and processes call disconnection (S311).

  FIG. 12 is a diagram illustrating an example of an operation flowchart according to the second operation sequence example in the content transmission device 1.

  When content is selected in the content transmission device 1 and a recipient (destination) that should originally browse the content is selected (S401), the content transmission device 1 calls the content reception device 2 using SIP (dial). (S403).

When the TCP session is established and the reception side capability notification is made, the content encryption unit 13 encrypts the content to be transmitted (S405), and the content transmission unit 14 transmits the encrypted content to the content reception device. 2 (S407).

  Next, when the content transmission device 1 receives a transmission completion response from the content reception device 2 (S409), the content transmission device 1 disconnects the call (S411).

  Next, the key transmission unit 15 of the content transmission apparatus 1 searches the key transmission destination information storage unit 12 for key transmission destination information corresponding to the selected recipient (destination), and decrypts the encrypted content. The key to be transmitted is transmitted to the key transmission destination indicated by the key transmission destination information by the key transmission method indicated by the key transmission destination (S413).

Subsequently, the next process (for example, reception of the next content) is performed (S415).
FIG. 13 is a diagram illustrating an example of an operation flowchart according to the second operation sequence example in the content receiving device 2.

  When the reception of the encrypted content is completed (S501), the content receiving device 2 processes the call disconnection (S503), and performs the next processing (for example, reception of the next content) (S505).

  Thereafter, the content receiving apparatus 2 accepts an instruction to decrypt the encrypted content (S507), and when the key (S509) received by the receiver is input, the content receiving device 2 decrypts the content with the key. (S511).

  If the content receiving device 2 can decrypt the content, the content receiving device 2 prints or displays the decrypted content, for example (S513).

  On the other hand, if the content receiving device 2 could not decrypt, the content receiving device 2 re-enters the key (S515).

  As described above, in the content transmission / reception system according to the embodiment of the present invention, the content transmission device 1 stores transmission history information including the content name of the content transmitted from the content transmission device 1 and the destination of the content. For each destination of the content that is encrypted and transmitted by the history information storage unit 11 and the content transmission device 1, a key for decrypting the content transmitted to the destination is passed through the content reception device that receives the content. Without selecting the transmission history information corresponding to the content that should not have been transmitted from the key transmission destination information storage unit 12 for storing the key transmission destination information indicating the transmission destination at the time of transmission and the transmission history information storage unit 11 And a deletion instruction including the content name in the selected transmission history information to the content receiving device 2 A delete instruction transmission unit 17 to be transmitted, a content encryption unit 13 for encrypting content to be transmitted from the content transmission device 1, and a content to be transmitted from the content transmission device 1 or the encrypted content. The content transmission unit 14 to be transmitted to the content receiving device 2 and the key transmission destination information corresponding to the destination of the content are searched from the key transmission destination information storage unit 12, and the key for decrypting the content is determined by the transmission destination information. The content transmission device 2 stores the content transmitted from the content transmission device 1, and if a deletion instruction is transmitted, the content reception device 2 includes a key transmission unit 15 that transmits to the transmission destination indicated. Content to be searched for and deleted from the content storage unit 21 with the content name in the delete instruction Constructed and a removal portion 23.

  According to this content transmission / reception system, the first problem can be solved, that is, the content transmitted from the content transmission device 1 and stored in the content reception device 2 can be deleted from the content transmission device 1, and thus originally transmitted. Even if content that should not be sent is transmitted, it can be deleted later and prevented from being viewed. Moreover, according to this content transmission / reception system, the second problem can be solved, that is, the content is encrypted and transmitted to the content receiving device 2, and the key for decrypting the content does not pass through the content receiving device 2. Therefore, even if the content is transmitted to the content receiving apparatus 2 that should not be transmitted, the content receiving apparatus 2 immediately decrypts the content. The content can be prevented from being viewed by a person other than the recipient who should originally view the content, and the key for decrypting the content is passed to the recipient who should originally view the content. The recipient can view the content.

  The content transmission / reception system may be configured to execute at least the first operation sequence example to solve the first problem. On the contrary, the content transmission / reception system may be configured to at least execute the second operation sequence example to solve the second problem.

  That is, the content transmission device 1 of the former content transmission / reception system includes a transmission history information storage unit 11 that stores transmission history information including the content name of the content transmitted from the content transmission device 1, and a transmission history information storage unit 11. A transmission history information selection unit 16 that selects transmission history information corresponding to content that should not have been transmitted, and a deletion instruction transmission unit that transmits a deletion instruction including the content name in the selected transmission history information to the content receiving device 2 17, the content receiving device 2 stores the content storage unit 21 that stores the content transmitted from the content transmitting device 1, and the content having the content name in the delete instruction when the delete instruction is transmitted. And a content deletion unit 23 that searches and deletes from the content storage unit 21. It is, can solve at least a first challenge.

  On the other hand, the content transmission device 1 of the latter content transmission / reception system includes a transmission history information storage unit 11 that stores transmission history information including the destination of the content encrypted and transmitted by the content transmission device 1, and the content transmission device 1. For each destination of the content to be transmitted after being encrypted, a destination for transmitting the key for decrypting the content transmitted to the destination without passing through the content receiving device 2 that receives the content is indicated. A key transmission destination information storage unit 12 that stores key transmission destination information, a content encryption unit 13 that encrypts content to be transmitted from the content transmission device 1, and transmits the encrypted content to the content reception device. Search the content transmission unit 14 and the key transmission destination information storage unit 12 for the key transmission destination information corresponding to the destination of the content , Is composed of at least a key for decrypting the content and a key transmission unit 15 to be transmitted to the transmission destination indicated by the destination information, we can solve at least the second problem.

  In the above description, each key transmission destination information in the key transmission destination information storage unit 12 associates a key transmission destination with a recipient (a content destination, that is, a person who should originally view the content). When the content is viewed on the recipient's personal computer or a personal computer shared by the group, it can be said that the original destination of the content is the personal computer, so the key transmission destination and the personal computer (content destination, that is, the original content A personal computer to be displayed) may be associated. For example, when the key is transmitted to the personal computer by electronic mail, the address indicates the personal computer, and there is no need to provide a recipient name or the like. When the key is transmitted by facsimile, a personal computer name or a group name sharing the personal computer may be provided instead of the recipient name.

  In any content transmission / reception system, a computer program for causing a computer to function as the content transmission apparatus or content reception apparatus is recorded on a computer-readable recording medium such as a semiconductor memory, a magnetic disk, an optical disk, a magneto-optical disk, or a magnetic tape. It can be recorded on a medium and can be widely distributed by being transmitted through a communication network such as the Internet.

DESCRIPTION OF SYMBOLS 1 ... Content transmitter 2 ... Content receiver 11 ... Transmission history information storage part 12 ... Key transmission destination information storage part 13 ... Content encryption part 14 ... Content transmission part 15 ... Key transmission part 16 ... Transmission history information selection part 17 ... Deletion instruction transmission unit 21 ... content storage unit 22 ... reception history information storage unit 23 ... content deletion unit

Claims (8)

A content transmission / reception system including a content transmission device for transmitting content and a content reception device for receiving content,
The content transmission device includes:
A transmission history information storage unit for storing transmission history information including the content name of the content transmitted from the content transmission device;
A transmission history information selection unit that selects transmission history information corresponding to content that should not have been transmitted from the transmission history information storage unit;
A deletion instruction transmission unit that transmits a deletion instruction including the content name in the selected transmission history information to the content receiving device;
The content receiving device is:
A content storage unit for storing content transmitted from the content transmission device;
A content transmission / reception system comprising: a content deletion unit that retrieves and deletes content having a content name in the deletion instruction from the content storage unit when the deletion instruction is transmitted. A content transmission / reception system including a content transmission device for transmitting content and a content reception device for receiving content,
The content transmission device includes:
A transmission history information storage unit for storing transmission history information including a destination of the content transmitted encrypted by the content transmission device;
For each content destination encrypted and transmitted by the content transmission device, a key for decrypting the content transmitted to the destination is transmitted without passing through the content reception device that receives the content. A key transmission destination information storage unit for storing key transmission destination information indicating a transmission destination;
A content encryption unit that encrypts content to be transmitted from the content transmission device;
A content transmission unit for transmitting the encrypted content to a content receiving device;
A key transmission unit that retrieves key transmission destination information corresponding to the destination of the content from the key transmission destination information storage unit, and transmits a key for decrypting the content to the transmission destination indicated by the transmission destination information A content transmission / reception system characterized by the above. A content transmission / reception system including a content transmission device for transmitting content and a content reception device for receiving content,
The content transmission device includes:
A transmission history information storage unit that stores transmission history information including a content name of the content transmitted from the content transmission device and a destination of the content;
For each content destination encrypted and transmitted by the content transmission device, a key for decrypting the content transmitted to the destination is transmitted without passing through the content reception device that receives the content. A key transmission destination information storage unit for storing key transmission destination information indicating a transmission destination;
A transmission history information selection unit that selects transmission history information corresponding to content that should not have been transmitted from the transmission history information storage unit;
A deletion instruction transmitting unit that transmits a deletion instruction including the content name in the selected transmission history information to the content receiving device;
A content encryption unit that encrypts content to be transmitted from the content transmission device;
A content transmission unit that transmits content to be transmitted from the content transmission device or the encrypted content to a content reception device;
A key transmission unit that retrieves key transmission destination information corresponding to the destination of the content from the key transmission destination information storage unit and transmits a key for decrypting the content to the transmission destination indicated by the transmission destination information. And
The content receiving device is:
A content storage unit for storing content transmitted from the content transmission device;
A content transmission / reception system comprising: a content deletion unit that retrieves and deletes content having a content name in the deletion instruction from the content storage unit when the deletion instruction is transmitted. The content storage unit stores the content transmitted from the content transmission device with another name,
The content receiving device includes a reception history information storage unit that stores reception history information including a content name of the content transmitted from the content transmission device and an alias of the content,
The content deletion unit searches the reception history information storage unit for reception history information including the content name in the deletion instruction, and searches the content storage unit for content having an alias in the reception history information and deletes the content. The content transmission / reception system according to claim 1 or 3. An operation method performed by a content transmission / reception system including a content transmission device that transmits content and a content reception device that receives content,
The content transmission device includes:
A transmission history information storage unit for storing transmission history information including the content name of the content transmitted from the content transmission device;
The content receiving device is:
A content storage unit for storing content transmitted from the content transmission device;
The operation method is as follows:
A step of selecting transmission history information corresponding to content that should not have been transmitted from the transmission history information storage unit by a transmission history information selection unit of the content transmission device;
A step of transmitting a deletion instruction including a content name in the selected transmission history information to the content reception device, wherein the deletion instruction transmission unit of the content transmission device;
The content deletion unit of the content receiving device includes a step of searching the content storage unit for a content having a content name in the deletion instruction and deleting the content when the deletion instruction is transmitted. Operation method of content transmission / reception system. The content storage unit stores the content transmitted from the content transmission device with another name,
The content receiving device includes a reception history information storage unit that stores a reception history information including a content name of the content transmitted from the content transmission device and an alias of the content,
The content deletion unit searches the reception history information storage unit for reception history information including the content name in the deletion instruction, and searches the content storage unit for content having an alias in the reception history information and deletes the content. The operation method of the content transmission / reception system according to claim 5. An operation method performed by a content transmission / reception system including a content transmission device that transmits content and a content reception device that receives content,
The content transmission device includes:
A transmission history information storage unit for storing transmission history information including a destination of the content transmitted encrypted by the content transmission device;
For each content destination encrypted and transmitted by the content transmission device, a key for decrypting the content transmitted to the destination is transmitted without passing through the content reception device that receives the content. A key transmission destination information storage unit for storing key transmission destination information indicating a transmission destination,
The operation method is as follows:
A content encryption unit of the content transmission device encrypting content to be transmitted from the content transmission device;
A content transmission unit of the content transmission device transmitting the encrypted content to a content reception device;
The key transmission unit of the content transmission device searches the key transmission destination information storage unit corresponding to the destination of the content from the key transmission destination information storage unit, and the transmission indicated by the transmission destination information is a key for decrypting the content A method for operating the content transmission / reception system, comprising: a step of transmitting the content first.   A computer program for causing a computer to function as a content transmission device or a content reception device in the content transmission / reception system according to claim 1.

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