JP2006127416A - Data transmitter, data transmission system, control method for data transmitter, control program of the data transmitter and recording medium recorded with the control program of the data transmitter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unauthorized use of data by a third party and to more promptly perform transmission processing of the data. <P>SOLUTION: The unauthorized use of contents to be transmitted is prevented and time required for the transmission processing of contents is shortened since this content transmitter 6 of this invention has a basic data extraction part 21 which extracts basic data 50 including partial data to be required for reproducing data as significant information from the contents and element specification information indicating what element of the contents the partial data is from the contents and separately transmits the basic data 50 and basic omission data 51 after the basic data 50 is extracted to a content acquisition processor 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data transmission device, a data transmission system, a data transmission device control method, and a data transmission device control program for transmitting the requested data to the information processing device with respect to the information processing device that requests data transmission. The present invention relates to a recording medium on which a control program for a data transmission apparatus is recorded.

  In recent years, new services utilizing large amounts of data, which are realized by the spread of high-speed communication lines, have been provided. For example, as this service, there is a service that distributes video content or music content to the user.

  Usually, when the user receives a video or music content distribution service, the user accesses the operator's site that provides the content and acquires the video or music content. In this way, when the user side receives a content distribution service from the operator's site, information that is normally transmitted and received between the user side and the operator side is encrypted to prevent unauthorized use of information by a third party. It has become. That is, security techniques such as public key encryption or private key encryption, digital certificate, and hash function are combined to prevent eavesdropping or falsification of information.

  For example, when content such as video or music data is transmitted from a server providing content to a terminal device owned by the user, the server itself encrypts the content to be transmitted as shown in FIG. Then, the server transmits the encrypted content to the terminal device. On the other hand, the user side apparatus receives the encrypted content, performs decryption processing on the content, and acquires the content. The encrypted content is transmitted using a protocol for performing encrypted communication such as SSL.

In order to prevent unauthorized use of information as described above, for example, in Patent Document 1, a decryption key for decrypting encrypted content and a supply of the decryption key to a terminal device connected to a network are provided. A key distribution device that manages the number of possible managements is disclosed. This key distribution device determines whether or not the terminal device connected to the home network is a valid supply destination, and distributes the decryption key to the valid supply destination. Therefore, unauthorized use of data is prevented and transmitted data cannot be used quickly.
JP 2004-112788 A (published April 8, 2004)

  However, in the above conventional configuration, in order to prevent unauthorized use of data by a third party in data transmission, the data is encrypted and transmitted to the transmission destination. For this reason, when content such as large-capacity moving image data is transmitted to a transmission destination and this content is used at the transmission destination, it takes a lot of time to encrypt the content or decrypt the encrypted content. This causes a problem.

  The present invention has been made in view of the above problems, and its purpose is to prevent unauthorized use of data by a third party and to perform data transmission processing more quickly, A data transmission system, a data transmission device control method, a data transmission device control program, and a recording medium recording the data transmission device control program are provided.

  In order to solve the above-described problem, a data transmission device according to the present invention is a data transmission device that transmits data to an information processing device that requests transmission of data. And the information processing apparatus can identify the partial data including information necessary for reproducing the data as significant information and which element of the data is the partial data. Extraction means for extracting basic data including element specifying information for performing extraction from the data, basic data transmission means for transmitting the basic data extracted by the extraction means to the information processing apparatus, and extraction from the data And a missing data transmission means for transmitting missing data, which is residual data from which basic data has been extracted by the means, to the information processing apparatus.

  According to the above configuration, since the basic data transmission unit and the missing data transmission unit are provided, the basic data extracted by the extraction unit and the missing data that is the residual data from which the basic data is extracted from the data are provided. The information can be transmitted separately to the information processing apparatus.

  The basic data is, for example, data indicating luminance information or color information included in the image data when the data to be transmitted is image data. Alternatively, when the data is compressed and transmitted to the information processing apparatus, the basic data is information necessary for reproduction from the compressed data, for example.

  That is, if the basic data is stolen by a malicious third party during transmission, the third party cannot be used illegally because the basic data alone is not complete data. Further, when missing data is stolen by a malicious third party during transmission, the missing data cannot be used illegally because the missing data alone is not complete data.

  The element specifying information included in the basic data is data that allows the information processing apparatus to specify which element of the data the partial data is. For this reason, even if basic data and missing data are stolen by a third party, the third party cannot combine both the stolen data with the above data. For this reason, the third party cannot illegally reproduce the data.

  By the way, conventionally, when data is transmitted, the data is encrypted and transmitted to the information processing apparatus as a transmission destination in order to prevent the data from being stolen and used illegally.

  For this reason, the information processing apparatus requires a process for encrypting data to be transmitted and a process for decrypting the encrypted data. Note that the data encryption or the decryption process of the encrypted data requires a longer time for the process as the data amount of the data increases.

  However, since the data transmission device according to the present invention is configured to separate the basic data and the missing data and transmit each separately, in the data transmission processing, the conventional encryption processing and encryption There is no need to perform a decryption process. For this reason, the time required for the data transmission processing between the data transmission device and the information processing device can be shortened.

  Therefore, the data transmission apparatus according to the present invention has an effect of preventing unauthorized use by a third party of data to be transmitted and performing data transmission processing more quickly.

  The data transmitting apparatus according to the present invention further includes a compression unit that encodes and compresses the data in the configuration described above, and the partial data is information obtained from the data encoded by the compression unit. It is preferable that the data includes information necessary for normal reproduction of the data compressed in the information processing apparatus.

  According to the above configuration, since the compression unit is provided, the data can be compressed and transmitted to the information processing apparatus. For this reason, since the data amount of the data to transmit can be reduced, the transmission time of the data can be shortened.

  Note that the information necessary for reproducing the compressed data is, for example, information used for prediction when the data is encoded. Examples of this information include the following information.

  For example, when the data is video data, it is intra-coded information that is encoded from information in a frame and does not use other images for prediction.

  Further, for example, when the data is moving image data, it is a quantized value of a direct current (DC) component of a DCT coding coefficient when inter-frame coding using DCT is performed on the moving image data.

  In addition, for example, by referring to a frame that has already been encoded, this indicates a spatial deviation when a frame to be encoded next is predicted, and information (motion vector) expressing a motion amount used in motion compensation It is.

  For example, when the data is moving image data, it is an I-picture that is a frame used when high-speed playback is performed from compressed data.

  Further, when the data has a hierarchical information configuration, for example, the content includes basic hierarchical information and difference information thereof, and partial data may be the basic delivery information.

The information necessary for normally reproducing the compressed data includes, for example, luminance information of the data when the data is moving image or still image data.
Also, the information necessary for normal reproduction of the compressed data is, for example, either information indicating a basic layer or information indicating an additional layer in layer coding information.

  In addition, the range of partial data extracted from the data may be a picture unit, a slice unit, or a macroblock unit. The partial data extracted from the data may be in units of blocks.

  Thus, since the partial data included in the basic data is data including information necessary for normal reproduction of the compressed data, it is normal if both the basic data and the missing data are not combined. Will not play.

  That is, even if either the basic data or the missing data is stolen during transmission by a malicious third party, the third party cannot reproduce the data normally.

  Further, since there is no need to perform a process of decrypting the encrypted data, the information processing apparatus can quickly reproduce the data acquired from the data transmission apparatus.

  Therefore, the data transmission device according to the present invention can prevent unauthorized use of data by a third party and perform data transmission processing more quickly.

  In the data transmission device according to the present invention, in the configuration described above, the data has information in the time axis direction, and the basic data transmission means includes a basic data extracted from data every predetermined time in the data. Each piece of data is transmitted in the order in which the data is reproduced. Further, user identification information, which is information for identifying a user of the information processing apparatus, is periodically transmitted from the beginning of basic data transmission by the basic data transmission means. Receiving means for receiving the information and determining means for determining whether or not the user of the information processing apparatus is a regular transmission destination of the data based on the user specifying information received by the reception means. When the determination means determines that the user is an authorized transmission destination of data, the basic data transmission means It is preferably configured to transmit the basic data as a raw sequence.

  Here, the data having information in the time axis direction is information having time direction information such as moving image data or music data.

  According to the above configuration, a determination unit is provided, and the determination unit can determine whether or not the user is a regular transmission destination. For this reason, during transmission of data having information in the time axis direction, it is possible to periodically check whether the transmission destination of the data is a regular transmission destination.

  Further, when the determination means determines that the user is a regular transmission destination, the basic data transmission means is the basic reproduction extracted from the data for every predetermined period in the data, which is the next reproduction order. Send data.

  In this way, the basic data transmitting means transmits only basic data extracted from data every predetermined period of data, so even if the data transmission destination is not a regular transmission destination, this is not regular. The above data cannot be completely acquired at the transmission destination.

  As described above, the data transmission apparatus according to the present embodiment can periodically check the data transmission destination and can transmit complete data only to the regular transmission destination. Can be prevented from unauthorized use.

  Further, the data transmission device according to the present invention may be configured such that, in the configuration described above, the basic data transmission unit includes an encryption unit that encrypts the basic data transmitted to the information processing device. .

  According to the above configuration, since the basic data transmission means includes the encryption means, the encrypted basic data can be transmitted to the information processing apparatus that is the data transmission destination.

  For this reason, it is possible to prevent the basic data and the missing data from being acquired by a malicious third party and combining them.

  In addition, since the basic data to be encrypted occupies a small amount of data in the entire data, the time required for decrypting the basic data encrypted in the information processing apparatus as the transmission destination is the same as the entire encrypted data. It becomes smaller than the case of decoding.

  Therefore, the data transmission apparatus according to the present invention prevents the unauthorized use of data by a third party and allows the data to be reproduced in a short time in the information processing apparatus that is the data transmission destination. There is an effect that it can be transmitted.

  In addition, a data transmission system according to the present invention is a data transmission system including the above-described data transmission device and an information processing device that requests the data transmission device to transmit data in order to solve the above-described problem. The information processing apparatus is a part of the elements constituting the data, and includes partial data including information necessary for reproducing the data as significant information, and the partial data is the data Basic data receiving means for receiving basic data including element specifying information for specifying which element of the data from the data transmitting device, and missing data obtained by extracting the basic data from the data Received from the data transmitting device, the basic data received by the basic data receiving means, and the missing data receiving means. The received missing data, characterized in that it comprises a synthesizing means for synthesizing on the basis of the element identification information included in the basic data.

  According to the above configuration, in the data transmission system according to the present invention, since the data transmission device includes the extraction unit, the data to be transmitted is separated into the basic data and the missing data and transmitted to the information processing device. be able to.

  Further, since the information processing apparatus includes the synthesizing unit, the data can be obtained by synthesizing the basic data received from the data transmitting apparatus and the missing data.

  Therefore, when the data transmission system according to the present invention transmits data from the data transmission device to the information processing device, it is possible to prevent unauthorized use of the data by a third party and to perform data transmission processing. There exists an effect that the time which concerns can be shortened.

  In order to solve the above-described problem, a data transmission system according to the present invention includes a data transmission device including the basic data transmission unit, the missing data transmission unit, the reception unit, and the determination unit. A data transmission system including an information processing device that requests the data transmission device to transmit data, wherein the data has information in a time axis direction, and the information processing device Basic data receiving means for receiving basic data extracted from data every predetermined time from the data transmitting apparatus, missing data receiving means for receiving the missing data from the data transmitting apparatus, and basic data receiving means The basic data received and the missing data received by the missing data receiving means are included in the basic data. When the basic data and the missing data are combined by the combining means for combining based on the element specifying information, the storage device for storing the user specifying information, and the combining means, the information is stored in the storage device. And a user identification information transmitting means for transmitting the user identification information to the data transmission device.

  According to the above configuration, in the data transmission system according to the present invention, since the information processing apparatus includes the user specifying information transmission unit, the basic data extracted from the data for every predetermined time in the data and the missing data When the data is combined, the user identification information can be transmitted to the data transmission device.

  On the other hand, if the data transmission device determines that the user is a regular transmission destination based on the user identification information received from the information processing device by the determination means, the data for every predetermined time in the data Can be transmitted to the information processing apparatus.

  That is, in the information processing apparatus used by the user who is the regular transmission destination of the data, the basic data and the missing data are synthesized. Then, when the data desired to be transmitted is partially combined, it is possible to request transmission of basic data in the next reproduction order by transmitting the user specifying information.

  In other words, if the information processing device that is the data transmission destination is being used by a legitimate user, the data that has the next playback order can be obtained by transmitting user-specific information each time data synthesis is partially completed. Basic data extracted from can be acquired, and finally, basic data of the entire data can be acquired.

  Therefore, the data transmission system according to the present invention can synthesize and acquire complete data only for users who are recognized as regular transmission destinations.

  In addition, in order to solve the above-described problem, a data transmission device control method according to the present invention controls a data transmission device that transmits data to an information processing device that requests data transmission. A partial data including information necessary for reproducing the data as significant information, and the partial data is included in the data. A step of extracting basic data including element specifying information for enabling the information processing apparatus to specify which element of the information processing apparatus, and the basic data extracted by the extraction means to the information processing apparatus And transmitting to the information processing apparatus missing data, which is residual data obtained by extracting the basic data from the data by the extracting means. Characterized in that it comprises a flop.

  Therefore, the control method of the data transmission device according to the present invention has the effects of preventing unauthorized use by a third party of data to be transmitted and performing data transmission processing more quickly.

  The data transmission device may be realized by a computer. In this case, the data transmission device control program for causing the data transmission device to be realized by the computer by operating the computer as each of the means, and the data thereof A computer-readable recording medium in which a control program for the transmission apparatus is recorded also falls within the scope of the present invention.

  As described above, the data transmission apparatus according to the present invention is a data transmission apparatus that transmits data to an information processing apparatus that requests transmission of data, and is one of the elements constituting the data. In order for the information processing apparatus to be able to specify partial data including information necessary for reproducing the data as significant information and which element of the data is the partial data Extraction means for extracting basic data including the element specifying information from the data, basic data transmission means for transmitting the basic data extracted by the extraction means to the information processing apparatus, and extraction means from the data by the extraction means And a missing data transmitting means for transmitting missing data, which is residual data from which basic data has been extracted, to the information processing apparatus.

  As described above, the extraction means for extracting the basic data from the data, the basic data transmission means for transmitting the basic data extracted by the extraction means to the information processing apparatus, and the remaining data from which the basic data is extracted from the data Data transmission means for transmitting the missing data to the information processing device, the data transmission device according to the present invention prevents unauthorized use of the data to be transmitted by a third party, and data transmission processing The effect is that it can be performed more quickly.

  The data transmission system according to the present invention is a data transmission system including the data transmission device described above and an information processing device that requests the data transmission device to transmit data, as described above. The information processing device is a part of the elements constituting the data, and includes partial data including information necessary for reproducing the data as significant information, and the partial data Basic data receiving means for receiving basic data including element specifying information for specifying whether the data is an element from the data transmitting device, and missing data obtained by extracting the basic data from the data are transmitted to the data Missing data receiving means received from the device, basic data received by the basic data receiving means, and missing data received by the missing data receiving means And over data, characterized by comprising a synthesizing means for synthesizing on the basis of the element identification information included in the basic data.

  Therefore, when the data transmission system according to the present invention transmits data from the data transmission device to the information processing device, it is possible to prevent unauthorized use of the data by a third party and to perform data transmission processing. There exists an effect that the time which concerns can be shortened.

  In order to solve the above-described problem, the data transmission system according to the present invention includes a data transmission apparatus including the basic data transmission unit, the missing data transmission unit, and the determination unit as described above. A data transmission system including an information processing device that requests the data transmission device to transmit data, wherein the data has information in a time axis direction, and the information processing device Basic data receiving means for receiving basic data extracted from data every predetermined time from the data transmitting apparatus, missing data receiving means for receiving the missing data from the data transmitting apparatus, and basic data receiving means Elements included in the basic data, the received basic data and the missing data received by the missing data receiving means When the basic data and the missing data are synthesized by the synthesizing unit, the synthesizing unit for synthesizing based on the constant information, the storage device for storing the user specifying information, and the synthesizing unit, the data is stored in the storage device. It is characterized by comprising user identification information transmitting means for transmitting user identification information to the data transmission device.

  Therefore, the data transmission system according to the present invention can synthesize and acquire complete data only for users who are recognized as regular transmission destinations.

  In addition, as described above, the data transmission device control method according to the present invention is a data transmission device control method for controlling a data transmission device that transmits data to an information processing device that requests data transmission. And is a part of the elements constituting the data, including partial data including information necessary for reproducing the data as significant information, and which element of the data is the partial data. A step of extracting basic data including element specifying information for enabling the information processing device to specify whether or not there is, and a step of transmitting the basic data extracted by the extracting means to the information processing device. And transmitting the missing data, which is residual data obtained by extracting the basic data from the data by the extracting means, to the information processing apparatus. And it features.

  Therefore, the control method of the data transmission device according to the present invention has the effects of preventing unauthorized use by a third party of data to be transmitted and performing data transmission processing more quickly.

  An embodiment of the present invention will be described below with reference to FIGS.

  First, the content distribution processing system 1 according to the present embodiment will be described with reference to FIG. FIG. 2 shows an embodiment of the present invention and is a block diagram showing a configuration of a main part of the content distribution processing system 1.

  As shown in FIG. 2, the content distribution processing system 1 according to the present embodiment includes a content providing server 2 and a user terminal 3, which are connected to each other through a communication network.

  The content providing server 2 transmits the requested content 10 to the user terminal 3 in response to a transmission request for the content 10 from the user terminal 3. The content providing server 2 includes a content management server 5 that manages a content group 7 including a plurality of contents 10 and a content distribution device. The content 10 managed by the content management server 5 is a sentence, music, image, video, or a combination thereof expressed in digital data.

  The content distribution apparatus acquires and holds a plurality of types of content 10 from the content management server 5 in advance. Then, in response to a transmission request for the content 10 from the user terminal 3, the content distribution device sends the requested content 10 among the held content 10 to the content acquisition processing device 8 included in the user terminal 3. To be sent.

  In addition, when the content distribution apparatus receives a transmission request for the content 10 from the user terminal 3, the content distribution apparatus performs personal authentication of the user who operates the user terminal 3. The content distribution apparatus can also determine whether or not the user of the user terminal 3 making a transmission request for the content 10 is an authorized user. A detailed description of the configuration of the content distribution apparatus will be described later.

  The user terminal 3 requests transmission of the content 10 and reproduces the transmitted content 10. The user terminal 3 includes a content acquisition processing device 8 and an input / output device 9.

  The content acquisition processing device 8 requests the content distribution device 6 included in the content providing server 2 to transmit the content 10 desired by the user. The content acquisition processing device 8 also performs content 10 synthesis processing based on the content 10 received from the content distribution device 6 so that the content 10 can be reproduced by the input / output device 9. A detailed description of the configuration of the content acquisition processing device 8 will be given later.

  The input / output device 9 receives input from the user using an input unit, and displays the contents of an input instruction to the user or information of the transmitted content 10 using an output unit.

  Examples of the input means include a keyboard, a numeric keypad, a cursor key, a pointing device such as a mouse, and a touch panel. Examples of output means include various displays such as an LCD (Liquid Crystal Display).

  Here, with reference to FIG. 3, the relationship of the data transmitted / received between the content delivery apparatus 6 with which the content provision server 2 is provided, and the content acquisition processing apparatus 8 with which the user terminal 3 is provided is demonstrated. FIG. 3 shows an embodiment of the present invention and is a diagram showing a relationship of data transmitted and received between the content distribution device 6 and the content acquisition processing device 8.

  First, the transmitted / received data is roughly divided into content 10 and control information. The content 10 is the content 10 requested from the user terminal 3, and the content 10 is separated into basic data 50 and basic missing data 51, which are transmitted separately. A detailed description of the basic data 50 and the basic missing data 51 will be described later.

  In the content distribution processing system 1 according to the present embodiment, the basic data 50 and the basic missing data 51 are not encrypted and are transmitted using protocols such as TCP, UDP / IP, RTP / RTSP. The basic data 50 and the basic missing data 51 are transmitted by non-encrypted communication.

  The control information is transmitted from the user terminal 3 to the content providing server 2, for example, information requesting transmission of the content 10 (content transmission request), information specifying the requested content 10, Authentication information 42 and the like. Alternatively, information for confirming transmission of the content 10 transmitted from the content providing server 2 to the user terminal 3, information for requesting transmission of the user authentication information 42, and the like.

  The control information is transmitted and received after establishing a session for encrypted communication such as SSL communication between the content providing server 2 and the user terminal 3. That is, the control information is transmitted and received between the user terminal 3 and the content providing server 2 through an encrypted communication path.

(Configuration of content distribution device)
Next, the configuration of the content distribution device 6 will be described with reference to FIG. FIG. 1 is a diagram showing a schematic configuration of the content distribution apparatus 6 according to the present embodiment. Moreover, in this figure, only the member with which the content delivery apparatus 6 is directly transmitted / received among the members with which the content acquisition processing apparatus 8 is provided is shown. This is to clarify data transmission / reception between the content distribution device 6 and the content acquisition processing device 8.

  Therefore, the description of the members of the content acquisition processing device 8 shown in FIG. 1 will be made in the description of the configuration of the content acquisition processing device 8 described later.

  The content distribution device 6 includes a content information encoding unit 20, a basic data extraction unit 21, an information storage unit 22, a user authentication unit 26, a content request reception processing unit 23, an authentication information receiving unit 24, a periodic authentication information receiving unit 25, A basic data transmission processing unit 27 and a basic missing data transmission processing unit 28 are provided.

  The information storage unit 22 is a readable / writable recording medium, and includes content list information 40, authentication information 42, periodic authentication information 41, and a content data group 43. The content list information 40 is list information for indicating each content 10 acquired from the content management server 5.

  That is, the content information encoding unit 20 (described later) acquires a content ID from the content 10 when the content 10 is received from the content management server 5 and encoded. Then, the content information encoding unit 20 records the acquired content ID in the information storage unit 22 and manages it as the content list information 40. That is, the content list information 40 is content ID list information assigned to the content 10 received from the content management server 5.

  The authentication information 42 is information indicating a user who is properly registered as a transmission destination of the content 10, and is information such as a user ID assigned to the normal user or a user password arbitrarily determined by the user.

  That is, in order for the user to use the content distribution processing system 1 according to the present embodiment, user registration is performed, and the user ID and the user password are stored in the information storage unit 22 at the time of registration. .

  The content data group 43 is a data group of the content 10 received from the content management server 5. For each content 10, basic data 50 and basic missing data 51 of the content 10 are associated and stored. The basic data 50 is divided into basic data 50 every predetermined time as shown in FIG. FIG. 4 is a diagram showing the relationship between the content 10 and the divided basic data 50.

That is, when the total reproduction time of the content 10 is 10 minutes, the basic data 50 of the content 10 is divided for each basic data 50 extracted from the content 10 for 2 minutes. For example, in FIG. 4, the basic data extracted from the content 10 of the reproduction time _{0 to T} 1 (2 min), the basic data extracted from the content 10 of the reproduction time _T 1 _~T 2 (2 min), ... and so on The basic data 50 is divided.

  By the way, the content distribution processing system 1 according to the present embodiment is configured such that during the transmission of the compressed content 10, the user of the user terminal 3 that is the transmission destination is periodically authenticated, that is, the periodic authentication is performed. Has been.

  Therefore, the content distribution apparatus 6 according to the present embodiment does not transmit all the basic data 50 of the requested content 10 to the user terminal 3 in order to perform the periodic authentication process, and the predetermined content 10 in the requested content 10 The basic data 50 extracted from the content 10 for the time is transmitted. The content distribution device 6 sequentially transmits the remaining divided basic data 50 each time it is confirmed that the transmission destination of the content 10 is a regular user.

  A detailed description of this periodic authentication will be given later.

  The content information encoding unit 20 receives each content 10 from the content group 7 held by the content management server 5 and encodes and compresses each content 10. The content information encoding unit 20 transmits each compressed content 10 to the basic data extraction unit 21 and instructs to extract the basic data.

  The basic data extraction unit 21 extracts basic data 50 from the received compressed content 10 in response to an instruction from the content information encoding unit 20. The basic data 50 includes partial data and element specifying information.

  This partial data is an element of data constituting the content 10 and is information necessary for reproducing the content 10 as significant information. That is, the content distribution apparatus 6 according to the present embodiment extracts numerical information about luminance information in a macroblock (motion compensation unit) after the content 10 is compressed as shown in FIG. 5 as the partial data. It is configured as follows.

  FIG. 5 is a diagram showing luminance information before and after compression for one frame constituting the content 10 that is moving image data. In FIG. 5, the pre-compression frame shows only luminance information as 8-bit information (0-255), and shows one pixel as a block representative value.

  By the way, when the content 10 is encoded and compressed, each frame can be composed of numerical information (information of intra coding) in the macroblock and difference information between the numerical information (after compression in FIG. 3). Frame). For this reason, when the compressed content 10 is reproduced, if the numerical information in the macroblock is missing, it cannot be reproduced as a significant moving image only by the difference information. On the contrary, a significant moving image cannot be reproduced only by the extracted partial information (numerical information in the macroblock).

  As described above, when partial information is extracted from the data of the content 10, it is not possible to reproduce and use only the extracted partial information or only the basic missing data 51 that is data after the partial information is extracted. .

  The element specifying information is information indicating the position from which partial information is extracted, such as which frame and position in the content 10 the macroblock is located in. Further, the element specifying information includes information indicating from which basic missing data 51 the basic data 50 is extracted.

  More specifically, the element specifying information is position coordinates regarding each macroblock in each frame. The element specifying information is expressed in a format that can be specified by the content acquisition processing device 8 provided in the user terminal 3 that is the data transmission destination.

The position coordinates can be obtained as follows. That is, the content 10 as moving image data is composed of a plurality of frames as shown in FIG. The content 10 can be expressed in three dimensions: a horizontal direction (x), a vertical direction (y), and a time axis direction (t). Accordingly, the position of the macro blocks contained in each _{frame, A (x T0, y T0} ), A (x T1, y T1), ... A (x Tn, y Tn) can be identified by expressed as.

X _T0 , x _T1 , x _Tn ... Is the x coordinate of a predetermined point of the macroblock (the top left vertex of the macroblock in this embodiment) after the time T0, T1,. Indicates the value.

In addition, y _T0 , y _T1 ,..., Y _Tn are y coordinates of a predetermined point of the macroblock (the top left vertex of the macroblock in this embodiment) after the time T0, T1,. Indicates the value.

  The element specifying information is added to the header portion of the basic data 50 as shown in FIG. 5 by replacing the information of the coordinate point indicating the position of the macro block of each frame obtained as described above with a bit string.

  In this way, when the basic data extracting unit 21 extracts the basic data 50 (element specifying information and partial data), the basic data extracting unit 21 stores the basic data 50 in association with the basic missing data 51 in the information storage unit 22.

  The content request acceptance processing unit 23 confirms the content 10 that the user of the user terminal 3 desires to transmit in response to the transmission request for the content 10 transmitted from the content acquisition processing device 8, Or instructing to perform authentication.

  The authentication information receiving unit 24 receives the authentication information 42 transmitted from the user terminal 3. The authentication information receiving unit 24 transmits the received authentication information 42 to the user authentication unit 26.

  If the periodic authentication information receiving unit 25 is set to periodically transmit the authentication information 42 from the user terminal 3 to the content distribution device 6 in the present embodiment, this periodic authentication information ( The periodic authentication information 41) is received.

  The user authentication unit 26 permits the user of the user terminal 3 as a regular transmission destination of the content 10 based on the authentication information 42 or the periodic authentication information 41 received from the authentication information receiving unit 24 or the periodic authentication information receiving unit 25. It is determined whether or not it has been done. Note that the user authentication unit 26 determines whether or not this is a regular transmission destination with reference to the authentication information 42 or the periodic authentication information 41 stored in advance in the information storage unit 22.

  The user authentication unit 26 confirms the use of the content 10 to the content request reception processing unit 23 when it is determined that the user who has requested transmission of the content 10 is a legitimate user based on the authentication information 42. To instruct.

  The user authentication unit 26 receives the information (content ID) of the content 10 selected by the user from the content request reception processing unit 23 and transmits the content 10 to the content acquisition processing device 8. The data transmission processing unit 27 and the basic missing data transmission processing unit 28 are instructed.

  Further, whenever the user authentication unit 26 determines that the transmission destination of the content 10 is a legitimate user based on the periodic authentication information 41, the user authentication unit 26 acquires the basic data 50 divided for the basic data transmission processing unit 27. To instruct.

  In response to an instruction from the user authentication unit 26, the basic data transmission processing unit 27 selects the basic data 50 of the content 10 requested to be transmitted from the information storage unit 22 and sends it to the content acquisition processing device 8. To be sent. In the basic data transmission processing unit 27, the basic data 50 acquired from the information storage unit 22 in response to an instruction from the user authentication processing unit is one of the basic data 50 divided as described above. is there. Then, the basic data transmission processing unit 27 acquires each of the divided basic data 50 in the order in which the content 10 is reproduced.

  Communication between the basic data transmission processing unit 27 and the content acquisition processing device 8 is performed by a protocol such as TCP, UDP / IP, or RTP / RTSP.

  The basic data transmission processing unit 27 includes a basic data acquisition unit 30, an encryption processing unit 31, and a basic data transmission unit 32.

  The basic data acquisition unit 30 acquires basic data stored in the information storage unit 22 in response to an instruction from the user authentication unit 26. The basic data acquisition unit 30 transmits the acquired basic data to the encryption processing unit 31 and instructs it to be encrypted. Note that the basic data 50 is acquired in accordance with the order in which the content 10 is reproduced, in accordance with the instruction to acquire the basic data 50 from the user authentication, in accordance with the order in which the content 10 is extracted. To do.

  The encryption processing unit 31 encrypts the basic data 50 in response to an instruction from the basic data acquisition unit 30. The encryption processing unit 31 transmits the encrypted basic data 50 to the basic data transmission unit 32 and instructs the content acquisition processing device 8 to transmit the basic data 50.

  The basic data transmission unit 32 transmits the basic data 50 to the basic data acquisition unit 30 included in the content acquisition processing device 8 in response to an instruction from the encryption processing unit 31.

  In response to an instruction from the user authentication unit 26, the basic missing data transmission processing unit 28 selects the basic missing data 51 of the content 10 desired by the user from the information storage unit 22 and transmits it to the content acquisition processing device 8. To do. The communication between the basic missing data transmission processing unit 28 and the content acquisition processing device 8 is performed by a protocol such as TCP, UDP / IP, or RTP / RTSP.

  The basic missing data transmission processing unit 28 includes a basic data acquisition unit 30 and a basic missing data transmission unit 34.

  The basic data acquisition unit 30 selects and acquires the basic missing data 51 of the content 10 desired by the user from the information storage unit 22 in accordance with an instruction from the user authentication unit 26. The basic data acquisition unit 30 transmits the acquired basic missing data 51 to the basic missing data transmission unit 34 and instructs the content acquisition processing device 8 to transmit the basic missing data 51.

  The basic missing data transmitting unit 34 transmits the basic missing data 51 to the basic missing data receiving unit 64 included in the content acquisition processing device 8 in response to an instruction from the basic missing data acquiring unit 33.

(Configuration of content acquisition processing device)
Next, the configuration of the content acquisition processing device 8 that receives the content 10 from the content distribution device 6 will be described with reference to FIG. FIG. 7 is a block diagram showing a schematic configuration of the content acquisition processing apparatus 8 according to the present embodiment.

  As shown in FIG. 7, the content acquisition processing device 8 includes an information input / output processing unit 62, a content request processing unit 60, an authentication information transmission processing unit 61, a periodic authentication information transmission processing unit 67, a basic data receiving unit 63, a cipher. A decryption processing unit 65, a basic missing data reception unit 64, a separated data composition processing unit 66, a content decryption processing unit 68, and a user information storage unit 69 are provided.

  The information input / output processing unit 62 performs input / output of information between the input / output device 9 and the content acquisition device. Specifically, the information input / output processing unit 62 transmits information input from the input / output device 9 to the content request processing unit 60 and the authentication information transmission processing unit 61, and the content is input via the content request processing unit 60. The input / output device 9 is instructed to display based on the information received from the distribution device 6.

  Further, the information input / output processing unit 62 causes the input / output device 9 to display information for inquiring whether or not the content 10 converted to the reproduction data needs to be reproduced. When receiving an instruction to perform reproduction from the input / output device 9, the content 10 converted into the reproduction data is transmitted to the input / output device 9.

  The content request processing unit 60 transmits and receives information to and from the content request reception processing unit 23 of the content distribution device 6. Details of information transmitted and received between the content request processing unit 60 and the content request reception processing unit will be described in the content request processing described later.

  The authentication information transmission processing unit 61 transmits the authentication information 42 input by the user of the user terminal 3 to the content distribution device 6. When the authentication information transmission processing unit 61 receives the authentication information 42 from the information input / output processing unit 62, the authentication information transmission processing unit 61 transmits the received authentication information 42 to the authentication information receiving unit 24 included in the content distribution device 6.

  The basic data receiving unit 63 receives the basic data 50 from the content distribution device 6. The basic data receiving unit 63 transmits the received basic data 50 to the separation / combination processing unit.

  The basic missing data receiving unit 64 receives the basic missing data 51 from the content distribution device 6. The basic missing data reception unit 64 transmits the received basic missing data 51 to the separated data composition processing unit 66.

  The separated data composition processing unit 66 synthesizes the basic data 50 received from the basic data receiving unit 63 and the basic missing data 51 received from the basic missing data receiving unit 64 to generate the compressed content 10. . The separated data composition processing unit 66 performs composition processing of the basic data 50 and the basic missing data 51 with reference to the composition information table 71 stored in the user information storage unit 69. Then, the content 10 corresponding to the amount for which the synthesizing process is completed is transmitted to the content decryption processing unit 68.

  That is, the content distribution device 6 is configured to transmit basic data 50 corresponding to 2 minutes of the content 10 to the content 10 having a playback time of 10 minutes, for example.

  For this reason, the separated data composition processing unit 66 synthesizes the content for 2 minutes out of the content 10 with a reproduction time of 10 minutes, and transmits it to the content decryption processing unit 68.

  The content acquisition processing device 8 is configured to perform periodic authentication processing while receiving the content 10 from the content distribution device 6. For this reason, the separation data composition processing unit 66 notifies the periodic authentication information transmission processing unit 67 that the composition is completed when the composition processing of the content 10 is completed based on only the transmitted basic data.

  The content decryption processing unit 68 decrypts the compressed content 10 synthesized by the separated data synthesis processing unit 66 and converts it into reproduction data.

  Incidentally, since the content distribution processing system 1 according to the present embodiment is configured to perform periodic authentication processing, the basic data 50 of the content 10 that requests transmission is partially transmitted. Therefore, the content 10 synthesized by the separated data synthesis processing unit 66 cannot be continuously converted into reproduction data. That is, if the reproduction data obtained by partial synthesis and decoding is reproduced as it is, the video is reproduced in a state where it is interrupted.

  Therefore, the content decryption processing unit 68 temporarily stores the decrypted content 10 so that the video is not interrupted. Then, the content decryption processing unit 68 sends the information 10 to the information input / output unit of the content 10 that has already been converted into reproduction data until the composition by the divided basic data 50 transmitted from the content distribution device 6 is completed. Synchronize the output.

  Further, in response to an instruction from the periodic authentication information transmission processing unit 67, the content decryption processing unit 68 sets the content ID of the content 10 together with the reproduction time of the content 10 that has been converted into the reproduction data to the periodic authentication processing. To the department.

  Note that content ID information and information indicating the total reproduction time of the content 10 are recorded at the beginning of the missing basic data received from the content distribution device 6. Therefore, when the content decryption processing unit 68 receives and decrypts the content 10 synthesized by the separated data composition processing unit 66, the content decryption processing unit 68 knows the total playback time of the content 10 and the playback time of the decrypted content 10. it can.

  The periodic authentication information transmission processing unit 67 acquires the periodic authentication information 41 from the user information storage unit 69 and transmits it to the content distribution device 6.

  That is, when the periodic authentication information transmission processing unit 67 receives a notification that the synthesis is completed from the separated data synthesis processing unit 66, the periodic authentication information transmission processing unit 67 sends to the content decryption processing unit 68 which of the content 10 data to be converted into reproduction data. It is confirmed whether data corresponding to only the playback time is synthesized. Then, the notification of the reproduction time of the data that has been combined and the content ID of the content 10 that is requested to be transmitted is received from the content decryption processing unit 68.

  Then, the periodic authentication information transmission processing unit 67 determines the necessity of transmission of the periodic authentication based on the content ID received from the content decryption processing unit 68 and the reproduction time of the data that has been converted into the reproduction data. When it is determined that there is a need for transmission of periodic authentication, that is, when it is determined that reproduction data for the entire content 10 has not been obtained, the periodic authentication information stored in the user information storage unit 69 41 is transmitted to the content distribution apparatus 6 together with the content ID.

  The periodic authentication information 41 is a user ID assigned to the user.

  Further, the periodic authentication information 41 transmitted from the periodic authentication information transmission processing unit 67 is encrypted and transmitted to the content distribution apparatus 6 using a protocol such as TCP, UDP / IP, or RTP / RTSP.

(Content request and transmission process)
Here, with reference to FIG. 8, the request | requirement and transmission process of the content 10 between the content provision server 2 and the user terminal 3 are demonstrated. FIG. 8 is a flowchart showing an example of a request for content 10 and a transmission process.

  First, a user authentication process is performed between the user terminal 3 and the content providing server 2 (S11). As a result of this authentication processing, when the content distribution device 6 of the content providing server 2 determines that the user is a regular user (“YES” in S12), the content acquisition processing device 8 of the user terminal 3 is notified. Information for prompting confirmation of whether or not to use the content 10 is transmitted (S13). If it is determined in step S12 that the user who performed the authentication process is not a regular user (“NO” in S12), the process ends.

  When the content acquisition processing device 8 receives information indicating whether or not the content 10 is to be used from the content distribution device 6 (S14), the content acquisition processing device 8 displays the information on the display unit of the input / output device 9 via the information input / output processing unit 62. A display for confirming whether or not to use the content 10 is performed (S15).

  Here, when the user inputs information indicating that the content 10 is to be used by operating the input / output device 9 (“YES” in S15), the content request processing is performed between the user terminal 3 and the content providing server 2. Is performed (S16). On the other hand, when the user inputs from the input / output device 9 that the content 10 is not used (“NO” in S15), the process ends.

  In the content request process of step S16, when the content 10 that the user desires to transmit is determined, the transmission process of the content 10 is performed between the content providing server 2 and the user terminal 3 (S17).

  That is, the divided basic data 50 and the basic missing data 51 of the content 10 are transmitted from the content distribution device 6 provided in the content providing server 2 to the content acquisition processing device 8 provided in the user terminal 3.

  In this way, when the divided basic data 50 and basic missing data 51 are received, the content acquisition processing device 8 determines whether or not the periodic authentication processing is necessary (S18). Here, when it is determined that periodic authentication is necessary, transmission processing of periodic authentication is performed between the user terminal 3 and the content providing server 2 (S19).

  As a result of the periodic authentication process, while the authentication is successful (“YES” in S20), the processes in steps S17 to S19 are repeated. On the other hand, if the authentication fails as a result of the periodic authentication process (“NO” in S20), the process ends.

  If there is no need for periodic authentication (“NO” in S18), that is, the basic data 50 and the basic missing data 51 of the content 10 that has already been requested to be transmitted without performing periodic authentication are all combined. If it is, the user terminal 3 confirms whether or not the content 10 is reproduced (S21).

  That is, when the basic data 50 and the basic missing data 51 of the content 10 that is requested to be transmitted are all combined and converted into reproduction data by the content decryption processing unit 68, the information input / output processing unit 62 Whether or not the requested content 10 is reproduced is displayed on the output device 9. Here, when the user inputs information to request the reproduction of the content 10 by operating the input / output device 9 (“YES” in S21), the information collection output processing unit converts the content converted into the reproduction data. 10 is transmitted to the input / output device 9. When the input / output device 9 receives the reproduction data for the content 10, the content 10 is reproduced based on the reproduction data (S22). This reproduction is performed until the information input / output processing unit 62 receives an instruction indicating the end of the reproduction from the user (until “YES” in S23).

  In step S21, when the user makes an input indicating that the content 10 is not reproduced ("NO" in S21), the processing in the content distribution processing system 1 ends.

(Authentication process)
Here, a detailed flow of the authentication process in the content distribution processing system 1 according to the present embodiment shown in FIG. 8 will be described with reference to FIG. FIG. 9 is a flowchart showing authentication processing in the content distribution processing system 1 according to the present embodiment.

  First, the user terminal 3 makes a transmission request for the content 10 (S31).

  That is, when the user inputs a transmission request for the content 10 through the input / output device 9, the input / output device 9 transmits the input transmission request to the content acquisition processing device 8. In the content acquisition processing device 8, the information input / output processing unit 62 receives a transmission request for the content 10. Then, the information input / output processing unit 62 passes the transmission request for the content 10 to the content request processing unit 60 and instructs the content distribution device 6 to transmit it.

  The content request processing unit 60 transmits a transmission request for the content 10 to the content distribution device 6 in response to an instruction from the information input / output processing unit 62.

  On the other hand, the content request reception processing unit 23 receives the content 10 transmission request transmitted from the content request processing unit 60 in this manner in the content distribution apparatus 6 (S32).

  When receiving the content 10 transmission request, the content request acceptance processing unit 23 requests the user terminal 3 to transmit the authentication information 42 (S33). That is, the content request acceptance processing unit 23 transmits information indicating a transmission request for the authentication information 42 to the content request processing unit 60 of the content acquisition processing device 8.

  When the content request processing unit 60 receives information indicating the transmission request for the authentication information 42 (S34), the content request processing unit 60 transmits the received information to the information input / output processing unit 62. The information input / output processing unit 62 instructs the input / output device 9 to perform display based on the received information. In response to an instruction from the information input / output processing unit 62, the input / output device 9 outputs to prompt the user to input the authentication information 42.

  When the user operates the input / output device 9 and inputs the user ID and password assigned to him / her as the authentication information 42, the authentication information 42 is sent from the input / output device 9 to the information input / output processing unit of the content acquisition processing device 8. 62. When the information input / output processing unit 62 receives the authentication information 42, the information input / output processing unit 62 passes the received authentication information 42 to the authentication information transmission processing unit 61 and instructs the content distribution apparatus 6 to transmit it. In response to the instruction from the information input / output processing unit 62, the authentication information transmission processing unit 61 transmits the authentication information 42 to the authentication information receiving unit 24 included in the content distribution device 6 (S35).

  Upon receiving the authentication information 42 from the authentication information transmission processing unit 61 of the content acquisition processing device 8, the authentication information receiving unit 24 transmits it to the user authentication unit 26. The user authentication unit 26 performs authentication by comparing the authentication information 42 received from the authentication information receiving unit 24 with the authentication information 42 recorded in the information storage unit 22 (S36).

(Content request processing)
Next, content request processing in the content distribution processing system 1 shown in step S16 of FIG. 8 will be described with reference to FIG. FIG. 10 is a flowchart showing content request processing in the content distribution processing system 1 according to the present embodiment.

  When it is determined in step S15 shown in FIG. 8 that the user uses the content 10, the user requests information (content list request information) for transmitting list information of the available content 10 to the input / output device 9. Enter by. The content list request information input by the user is received by the information input / output processing unit 62. When receiving the content list request information, the information input / output processing unit 62 instructs the content request acceptance processing unit 23 to transmit the content request information.

  In response to the instruction from the information input / output processing unit 62, the content request reception processing unit 23 transmits content list request information to the content request reception processing unit 23 included in the content distribution device 6 (S41).

  On the other hand, when receiving the content list request information (S42), the content request acceptance processing unit 23 acquires the content list information 40 from the information storage unit 22 and transmits it to the content acquisition processing device 8 (S43).

  In the content acquisition processing device 8, when the content request processing unit 60 receives the content list information 40 (S44), the content request processing unit 60 transmits the content list information 40 to the information input / output processing unit 62. When receiving the content list information 40, the information input / output processing unit 62 instructs the input / output device 9 to display the content list information 40. In response to an instruction from the information input / output processing unit 62, the input / output device 9 displays a content list (S45).

  Here, the user looks at the displayed content list and confirms whether or not the desired content 10 is included (S46). When the desired content 10 is included in the content list (“YES” in S46), the user selects the desired content 10 from the content list, and inputs / outputs the content ID of the selected content 10 The device 9 is operated to input.

  The content ID input by the input / output device 9 is received by the information input / output processing unit 62. The information input / output processing unit 62 then passes the received content ID to the content request processing unit 60 and instructs the content distribution device 6 to transmit it. Then, the content request processing unit 60 transmits the content ID to the content request reception processing unit of the content distribution device 6 in response to an instruction from the information input / output processing unit 62. Then, the content request reception processing unit transmits the content ID received from the information input / output processing unit 62 to the content request reception processing unit 23 included in the content distribution device 6 (S47).

  In the content distribution device 6, the content request acceptance processing unit 23 receives the content ID transmitted from the content request processing unit 60 (S48). Then, the content request acceptance processing unit 23 transmits this content ID to the user authentication unit 26.

  The processing flow of the content request processing in the content distribution processing system 1 according to the present embodiment has been described so far.

(Content transmission processing)
Next, the transmission process of the content 10 requested from the user terminal 3 in the content distribution processing system 1 shown in step S17 of FIG. 8 will be described with reference to FIGS. 11, 12, and 13. FIG. FIG. 11 is a flowchart showing a transmission process of the content 10 requested from the user terminal 3 in the content distribution processing system 1. FIG. 12 is a block diagram showing an outline of content transmission processing in the content distribution processing system 1 according to the present embodiment. FIG. 13 is a block diagram showing a comparative example of content transmission processing in the content distribution processing system 1 according to the present embodiment.

  First, when the user authentication is successful and the content 10 desired by the user is determined, the user authentication unit 26 sends the basic missing data corresponding to the content ID of the content 10 desired by the user to the basic missing data acquisition unit 33. 51 is instructed to be acquired from the information storage unit 22.

  In response to this instruction, the basic missing data acquisition unit 33 acquires the basic missing data 51 of the content 10 corresponding to the content ID from the content data group 43 stored in the information storage unit 22. The basic missing data acquisition unit 33 then passes the acquired basic missing data 51 to the basic missing data transmission unit 34 and instructs the content acquisition processing device 8 to transmit it.

  In response to this instruction, the basic missing data transmission unit 34 starts transmitting the basic missing data 51 received from the basic missing data acquisition unit 33 to the basic missing data reception unit 64 included in the content acquisition processing device 8 (S51). On the other hand, the basic missing data receiving unit 64 starts receiving the basic missing data 51 from the basic missing data transmitting unit 34 (S52), and sequentially transmits the received basic missing data 51 to the separated data synthesis processing unit 66.

  When the basic missing data transmitting unit 34 starts transmitting the basic missing data 51 to the basic missing data receiving unit 64, the user authenticating unit 26 next sets the content ID of the content 10 desired by the user to the basic data acquiring unit 30. An instruction to acquire the corresponding basic data 50 is given.

  In response to this instruction, the basic data acquisition unit 30 acquires a part of the basic data 50 of the content 10 corresponding to the content ID from the information storage unit 22. That is, as described above, the basic data 50 is divided every predetermined time with respect to the reproduction time of the entire content 10. For this reason, the basic data acquisition unit 30 acquires the basic data 50 for a predetermined time from the head portion of the basic data 50. Then, the acquired basic data 50 is transmitted to the encryption processing unit 31.

  When the encryption processing unit 31 acquires the basic data 50 from the basic data acquisition unit 30, the encryption processing unit 31 encrypts the basic data 50. Then, the encrypted basic data 50 is transferred to the basic data transmitting unit 32 and instructed to be transmitted to the user terminal 3.

  Then, the basic data transmitting unit 32 transmits the encrypted basic data 50 to the basic data receiving unit 63 included in the content acquisition processing device 8 in response to an instruction from the encryption processing unit 31 (S53).

  When the basic data 50 is received from the basic data transmitting unit 32 (S54), the basic data receiving unit 63 transmits the basic data 50 to the encryption / decryption processing unit 65. The encryption / decryption processing unit 65 decrypts the encrypted basic data 50 and transmits it to the separated data composition processing unit 66.

  The separated data composition processing unit 66 synthesizes the basic missing data 51 that has already been received and the received divided basic data 50. When the composition is finished, the periodic authentication information transmission processing unit 67 is notified that the composition is finished, and the compressed content 10 of the part where the composition is finished is transmitted to the content decryption processing unit 68.

  The processing flow of content transmission processing in the content distribution processing system 1 according to the present embodiment has been described so far.

  As described above, in the content distribution processing system 1 according to the present embodiment, as shown in FIG. 12, the basic missing data 51 and the divided basic data 50 are transmitted through physically different paths. Only the basic data 50 out of both data is encrypted and transmitted.

  Further, as shown in FIG. 13 as the transmission process of the content 10, the content 10 itself is encrypted from the content transmission unit 132 to the content reception unit without separating the content 10 into the basic data 50 and the basic missing data 51 as described above. It can also be configured to transmit to 133.

That is, in the case of the configuration of this comparative example, the content 10 is acquired from the storage device in which the content 10 is stored by the content acquisition unit 130, and the acquired content 10 is encrypted by the encryption processing unit 131. Then, the encryption processing unit 131 instructs the content transmission unit 132 to transmit the encrypted content 10 to the content reception unit 133 provided in the transmission destination of the content 10. The content receiving unit 133 causes the encryption / decryption processing unit 134 to decrypt the received encrypted content 10.
Here, regarding the transmission processing of the content 10, the content distribution processing system 1 according to the present embodiment and the configuration shown in FIG. 13 (comparative example) will be compared in the following points.

  First, when comparing the amount of data to be encrypted, since only the basic data 50 is encrypted in the configuration of the content distribution processing system 1 according to the present embodiment, the amount of data to be encrypted is smaller than in the configuration of the comparative example. . Similarly, the amount of data to decrypt the encrypted data is also reduced.

  That is, the basic data 50 includes partial data and element specifying information. The partial data is one element of data constituting the content 10 and is information necessary for reproducing the content 10 as significant information in the user terminal 3. In other words, in the content distribution device 6 according to the present embodiment, the partial data is numerical information about the luminance information in the macroblock (motion compensation unit) after the content 10 is compressed.

  The element specifying information is information indicating the position from which partial information is extracted, such as which frame and position in the content 10 the macroblock is located in. Accordingly, the data amount of the basic data 50 is smaller than the data amount of the entire content 10. In particular, as the data amount of the entire content 10 increases, the proportion of the basic data 50 to the data amount decreases.

  In other words, as the amount of data to be transmitted increases, the amount of data to be encrypted in the content distribution processing system 1 according to the present embodiment becomes much smaller than the amount of data that must be encrypted in the comparative example. .

  Therefore, the configuration in the content distribution processing system 1 according to the present embodiment regarding the transmission processing of the content 10 is more encryption or decryption processing than the configuration in which the entire content is encrypted as in the comparative example. Such time is significantly reduced.

(Regular authentication process)
Next, details of the transmission process of the periodic authentication information 41 shown in step S19 of FIG. 8 will be described with reference to FIG. FIG. 14 is a flowchart showing the periodic authentication process in the content distribution processing system 1 according to the present embodiment.

  First, before performing periodic authentication processing, the content acquisition processing device 8 according to the present embodiment is configured to determine whether or not periodic authentication processing needs to be performed (step S19 shown in FIG. 8). ).

  That is, the periodic authentication information transmission processing unit 67 receives a notification from the separated data synthesis processing unit 66 that the synthesis process with the basic data 50 has been completed. Then, when receiving this notification, the periodic authentication information transmission processing unit 67 transmits the compressed content 10, the playback time of the content 10, and the content ID of the content 10 to the content decryption processing unit 68. Instruct.

  In response to this instruction, the periodic authentication information processing unit 67 receives the content 10 decompressed and decompressed, the playback time of the content 10, and the content ID of the content 10 from the content decryption processing unit 68. Then, the periodic authentication information processing unit 67 determines whether or not it is necessary to perform periodic authentication, as shown in step S18 of FIG.

  The determination as to whether or not the periodic authentication process needs to be performed can be determined based on the following state.

  That is, when all the basic data 50 necessary for obtaining the content 10 desired by the user has been acquired, it is not necessary to perform the periodic authentication process.

  However, if all the basic data 50 related to the content 10 has not been acquired and only a part of the desired content 10 has been combined by the separated data combining processing unit, authentication is performed again to request transmission of further basic data 50 Must.

  Here, if the periodic authentication information transmission processing unit 67 determines that it is necessary to perform the periodic authentication process (“YES” in S19), the periodic authentication process is performed between the user terminal 3 and the content distribution device 6. This is performed (step S19 shown in FIG. 8).

  Specifically, this periodic authentication process is performed as follows.

  First, the periodic authentication information transmission processing unit 67 acquires the periodic authentication information 41 stored in the user information storage unit 69 and transmits it to the content distribution device 6 (S61).

  In the content distribution device 6, the periodic authentication information receiving unit 25 receives the periodic authentication information 41 transmitted from the periodic authentication information transmission processing unit 67 (S62). When the periodic authentication information receiving unit 25 receives the periodic authentication information 41, the periodic authentication information receiving unit 25 transmits the authentication information to the user authentication unit 26 and instructs to authenticate it.

  The above is the transmission processing of the periodic authentication information 41 in the content distribution processing system 1 according to the present embodiment.

  As described above, in the content distribution processing system 1 according to the present embodiment, when the content 10 is transmitted from the content distribution device 6 to the content acquisition processing device 8, the compressed content 10 is converted into the basic data 50 and the basic missing data 51. Send separately.

  For this reason, it is possible to reduce the time for encrypting the content 10 to be transmitted or decrypting the encrypted content 10. That is, the content distribution device 6 according to the present embodiment can quickly transmit the content 10 by the content acquisition processing device 8.

  The basic data 50 is one element of the data constituting the content 10, and significant information cannot be obtained with this data alone. The basic missing data 51 is data obtained by extracting the basic data 50 from the content 10 to be transmitted. For this reason, after all, only basic missing data 51 cannot obtain significant information.

  Then, in the content distribution processing system 1 according to the present embodiment, the content distribution apparatus 6 transmits the content 10 to be transmitted separately into basic data 50 and basic missing data 51. For this reason, even if basic data 50 or basic missing data 51 is stolen by a third party during transmission, the third party cannot obtain significant information from the stolen data. That is, in the content distribution processing system 1 according to the present embodiment, it is possible to prevent the content 10 from being stolen by a third party during the transmission of the content 10 and being illegally used.

  Therefore, in the content distribution processing system 1 according to the present embodiment, it is possible to prevent unauthorized use of the content 10 in the transmission of the content 10 and to perform the transmission processing of the content 10 more quickly.

  Further, the content distribution device 6 according to the present embodiment divides the basic data 50 into a plurality of pieces, and the divided basic data 50 is a regular user in the user terminal 3 in the periodic authentication process. Is transmitted every time it is confirmed. For this reason, the content distribution apparatus 6 can periodically check whether the transmission destination is an authorized user during transmission of the content 10.

  Therefore, since the content distribution apparatus 6 can transmit the content 10 while periodically checking the validity of the transmission destination of the content 10, the content 10 can be transmitted more safely.

  Note that the content distribution apparatus 6 according to the present embodiment is configured to extract numerical information about luminance information in the macroblock (unit of motion compensation) of the compressed content 10 as partial data included in the basic data 50. ing. However, the information extracted as partial data is not limited to this.

  For example, when there is no need to compress and transmit the content 10 in particular (for example, when the content 10 is text data), the content distribution device 6 may use character data at a predetermined interval or character data indicating a specific keyword. It may be information.

  Moreover, the word information with respect to the specific keyword in text data, or verb information may be sufficient.

  For example, when the content 10 is voice or music data, it may be information indicating a frequency component at a specific frequency, or time frame information constituting the voice or music data.

  For example, when the content 10 is moving image data, intra-encoded information that is encoded from information in a frame and does not use another image for prediction may be extracted as partial data. .

  That is, the content distribution device 6 uses the direct current (DC) component quantization value or the alternating current (AC) component quantization value of the DCT coding coefficient when the content 10 is subjected to inter-frame coding using DCT. It may be.

  Further, the content distribution device 6 indicates a spatial deviation when a frame to be encoded next is predicted by referring to an already encoded frame, and expresses a motion amount used in motion compensation. (Motion vector) may be used.

  For example, when the data is moving image data, it may be an I-picture that is a frame used when high-speed playback is performed from compressed data.

  Further, when the content has a hierarchical information configuration, the content includes basic hierarchical information and difference information thereof, and partial data can be used as the basic delivery information.

  In addition, the content distribution device 6 may be configured to extract information indicating a basic hierarchy in the hierarchical encoding information as the partial data.

  The range of the partial data extracted from the data may be a picture unit, a slice unit, a macroblock unit, or a block unit.

  That is, the partial data extracted from the content 10 to be transmitted by the content distribution device 6 is data including information necessary for normally reproducing the content 10 in the content acquisition processing device 8 that is the transmission destination of the content 10. I just need it.

  In addition, the content distribution processing system 1 according to the present embodiment is configured to include one user terminal 3 that is connected to the content providing server 2 and receives the content 10 from the content providing server 2. However, the number of user terminals 3 is not limited to this, and a configuration in which a plurality of user terminals 3 are communicably connected to one content providing server 2 may be employed.

  In this way, when receiving a transmission request for content 10 from a plurality of user terminals 3 to one content providing server 2, the partial data included in the basic data 50 may be different information for each user terminal 3. Good. For example, information indicating luminance information of the content 10 is extracted as partial data from the content 10 transmitted to one user terminal 3, and the content 10 is extracted from the content 10 transmitted to the other user terminal 3. An I-picture may be extracted as partial information from the constituent frames.

  Thus, by changing the type of partial information extracted from the content 10 for each user terminal 3 that transmits the content 10, transmission of the content 10 from the content distribution device 6 to the content acquisition processing device 8 is more secure. Can be done.

  In the content distribution processing system 1 according to the present embodiment, the basic data 50 extracted from the compressed content 10 and the basic missing data 51 that is the data of the content 10 from which the basic data 50 is extracted are respectively physically To the content acquisition processing device 8 via different routes.

  However, the basic data 50 and the basic missing data 51 are not transmitted through different paths, but the extracted basic data 50 is incorporated into an arbitrary location of the basic missing data 51 and transmitted as one data. Also good.

  This case can be realized by configuring the content distribution device 6 and the content acquisition processing device 8 as follows.

  That is, the content distribution device 6 includes a content data transmission processing unit (not shown) that acquires the basic data 50 and the basic missing data 51 instead of the basic data transmission processing unit 27 and the basic missing data transmission processing unit 28. The basic data 50 acquired by the content transmission processing unit is incorporated in an arbitrary location of the basic missing data 51 and transmitted to the content acquisition processing device 8 as content data.

  On the other hand, the content acquisition processing device 8 includes a content data receiving unit (not shown) instead of the basic data receiving unit 63 and the basic missing data receiving unit 64, and the content data receiving unit converts the received content data into separated data. The data is transmitted to the composition processing unit 66. Then, the separated data synthesis processing unit 66 refers to the synthesis information table 71 to identify basic data inserted at an arbitrary location in the basic missing data, and synthesizes this basic data with the basic missing data.

  Note that the composition table 71 recorded in the user information storage unit 69 includes information indicating where the basic data 50 is inserted in the transmitted content data and what partial data the basic data contains. Information indicating whether it is included is recorded.

  In the content distribution processing system 1 according to the present embodiment, the basic data 50 is encrypted in the content distribution device 6 and transmitted from the content distribution device 6 to the content acquisition processing device 8. However, the basic data 50 may be transmitted from the content distribution device 6 to the content acquisition processing device 8 without being encrypted.

  However, when a third party possesses a device having the same function as the content acquisition processing device 8 according to the present embodiment, the basic data 50 and the basic missing data 51 are wiretapped and synthesized by the third party. There is a fear. For this reason, the configuration in which the basic data 50 is encrypted and transmitted to the content acquisition processing device 8 as in the content distribution device 6 according to the present embodiment is more preferable in terms of ensuring the safety of data transmission.

  Further, the content distribution device 6 according to the present embodiment is configured to transmit the basic data 50 and the basic missing data 51 separately to the content acquisition processing device 8. In the basic data 50 and the basic missing data 51, only the former is encrypted by the encryption processing unit 31.

  However, the content distribution device 6 may be configured to encrypt the basic missing data 51 and transmit it to the content acquisition processing device 8 instead of encrypting the basic data 50.

  As described above, when the content distribution device 6 is configured to encrypt the basic missing data 51, the basic data 50 and the basic missing data 51 are illegally eavesdropped by a third party in the same manner as the configuration of encrypting the basic data 50. Can be prevented from being synthesized.

  When the content distribution device 6 is configured to encrypt only the basic missing data 51 and transmit it to the content acquisition processing device 8, the basic data transmission processing unit 27 includes the encryption processing unit 31 instead of the basic missing data transmission processing unit. 28 is configured to include a second encryption processing unit (not shown).

  That is, in the basic missing data transmission processing unit 28, the basic missing data 51 acquired by the basic missing data acquisition processing unit 33 is encrypted by the second encryption processing unit and passed to the basic missing data transmission unit 34. Then, the basic missing data transmission unit 34 transmits the encrypted basic missing data 51 to the content acquisition processing device 8.

  In this case, in the content acquisition processing device 8, the basic missing data 51 is received by the basic missing data receiving unit 64, and the received basic missing data 51 is decrypted by the encryption / decryption processing unit 65 and transmitted to the separated data synthesis processing unit 66. .

  The content distribution device 6 includes a second encryption processing unit (not shown) for encrypting the basic missing data 51 in addition to the encryption processing unit 31 for encrypting the basic data 50. It may be. That is, the content distribution device 6 may be configured such that the basic missing data transmission unit 34 transmits the basic missing data encrypted by the second encryption processing unit to the content acquisition processing device 8.

  In this case, the content acquisition processing device 8 on the receiving side of the basic missing data 51 includes a further second encryption / decryption processing unit (not shown) for decrypting the encrypted basic missing data 51.

  That is, the content acquisition processing device 8 receives the encrypted basic missing data 51 by the basic missing data receiving unit 64. Then, the content acquisition processing device 8 decrypts the encryption of the basic missing data 51 by the second encryption / decryption processing unit and transmits it to the separated data composition processing unit 66.

  As described above, when both the basic data 50 and the basic missing data 51 are encrypted and transmitted from the content distribution device 6 to the content acquisition processing device 8, it is possible to further improve the safety related to the transmission processing of the content 10.

  The basic data 50 includes partial data and element specifying information. However, in the content acquisition processing device 8, when the basic data 50 transmitted in real time and the basic missing data 51 are set to be combined, the basic data 50 is the element specifying information, and the basic data 50 is It does not have to include information indicating whether the data corresponds to the basic missing data 51.

  Further, in the content distribution processing system 1 according to the present embodiment, the basic data 50 divided during transmission of the basic missing data 51 from the content distribution device 6 to the content acquisition processing device 8 is used. The system was configured to perform periodic authentication.

  However, when the content 10 transmitted from the content distribution device 6 to the content acquisition processing device 8 does not require periodic authentication, the periodic authentication may not be performed. Note that the case where the content 10 does not require periodic authentication means that the content does not have information on the time axis, such as text data or moving image data. Or even if the information has information on the time axis, the information is very short.

  In such a case, the content distribution apparatus 6 according to the present embodiment does not need to divide the basic data 50 as shown in FIG. When the authentication information 42 input by the user is confirmed, the content distribution device 6 transmits the basic missing data 51 and the basic data 50 (basic data 50 not divided) to the content acquisition processing device 8. . Then, the content acquisition processing device 8 synthesizes the received basic data 50 and the basic missing data 51, and performs a decoding process (compression decompression) of the compressed data.

  Further, the content distribution device 6 according to the present invention has a configuration in which the content 10 is acquired from the content management server 5 in advance, separated into basic data 50 and basic missing data 51, and stored in the information storage unit 22. .

  However, the content distribution device 6 may be configured to acquire the content 10 from the content management server 5 in response to an instruction from the content request reception processing unit 23 that has received a content transmission request from the user of the user terminal 3. Good.

  That is, the user of the user terminal 3 is successfully authenticated, and the content request acceptance processing unit 23 receives the content ID of the selected content 10 from the user via the content request processing unit 60. Then, the content request acceptance processing unit 23 transmits the received content ID to the content management server 5 and instructs to transmit the content 10 corresponding to the content ID.

  On the other hand, the content management server 5 transmits the content 10 corresponding to the received content ID to the content distribution device 6 in response to an instruction from the content request reception processing unit 60.

  As described above, when the content distribution processing system 1 is configured such that the content management server 5 transmits the content 10 to the content acquisition processing device 6 in response to an instruction from the content request reception processing unit 23. The following effects are achieved.

  That is, the content acquisition processing device 6 does not need to acquire a plurality of contents 10 in advance, so that the storage capacity of the information storage unit 22 can be reduced.

  In the content distribution processing system 1 according to the present embodiment, the content distribution device 6 is configured as the content distribution device 106 shown in FIG. 15, and the content acquisition processing device 8 is the content acquisition processing device 108 shown in FIG. You may comprise as follows. In FIG. 15 or FIG. 16, the same members as those shown in FIG. 1 or FIG.

  Here, when the content distribution apparatus 6 shown in FIG. 1 and the content distribution apparatus 106 shown in FIG. 15 are compared, the following points are different. That is, the content distribution device 106 further includes a history information transmission processing unit 29, which acquires the history information 52 stored in the information storage unit 22 and transmits it to the content acquisition processing device 108. It is different in point to do. The history information 52 is information on the data amount of the entire content 10 and is information indicating the reproduction time of the entire content 10.

  The history information transmission processing unit 29 includes a history information acquisition unit 35 and a history information transmission unit 36. The history information acquisition unit 35 acquires the history information 52 stored in the information storage unit 22, passes the acquired history information 52 to the history information transmission unit 36, and transmits it to the content acquisition processing device 108. To instruct.

  Further, the history information transmission unit 36 transmits the history information 52 to the history information reception unit 72 included in the content acquisition processing device 108 in response to an instruction from the history information acquisition unit 35.

  In addition, when the basic data extraction unit 121 extracts the basic data 50 from the compressed content 10, the content distribution device 106 illustrated in FIG. 15 acquires the history information 52 of the content 10 and stores the history information 52 in the information storage unit 22. This is different from the content distribution device 6 in that respect.

  That is, the basic data extraction unit 21 of the content distribution device 6 illustrated in FIG. 1 divides the basic data 50 extracted from the compressed content 10 for each reproduction time of the predetermined content 10, The basic missing data 51 is stored in the information storage unit 22 in association with each other.

  On the other hand, the basic data extraction unit 121 included in the content distribution device 106 further includes information on the data amount of the entire content 10, and history information 52 indicating the playback time of the entire content 10 is converted into the basic data 50 and the basic missing data. 51 and stored in the information storage unit 22.

  When the authentication process performed based on the authentication information 42 input by the user is successful, the history information acquisition unit 35 requests the user from the information storage unit 22 in response to an instruction from the user authentication unit 26. The history information 52 of the content 10 is acquired. Then, the history information acquisition unit 35 instructs the history information transmission unit 36 to transmit the history information 52 to the content acquisition processing device 108.

  In response to this instruction, the history information transmitting unit 36 transmits the history information 52 to the history information receiving unit 72. The history information 52 may be encrypted and transmitted from the history information transmitting unit 36 to the history information receiving unit 72, or may be transmitted without being particularly encrypted.

  It should be noted that the history information 52 is not significant information especially for the third party by this information itself. However, the history information 52 is used in the content acquisition processing device 108 as a material for determining whether or not the periodic authentication information transmission processing unit 67 performs periodic authentication. For this reason, in order to prevent falsification of the history information 52 by a third party, it is preferable that the content distribution device 108 encrypts the history information 52 and transmits it to the content acquisition processing device 108.

  On the other hand, the content acquisition processing device 108 shown in FIG. 16 differs from the content acquisition processing device 8 shown in FIG. 7 in the following points. That is, the content acquisition processing device 108 is different from the content acquisition processing device 8 in that it further includes a history receiving unit 72.

  The history information receiving unit 72 receives the history information 52 transmitted from the content distribution device 106. The history information receiving unit 72 transmits the received history information 52 to the separated data synthesis processing unit 166.

  7 receives the basic data 50 and the basic data 50 received when the basic data 50 that is divided into a plurality of pieces is received while the basic missing data 51 is being received. The missing data 51 is combined, and the periodic authentication information transmission processing unit 67 is notified that the combination has been completed.

  On the other hand, in the content acquisition processing device 108 shown in FIG. 16, the separated data composition processing unit 166 temporarily stores the history information 52 received from the history information receiving unit 72 in the user information storage unit 69. Then, the separation data composition processing unit 166 checks only the data amount corresponding to the reproduction time of the content 10 to be composed in the history information 52 when performing the composition processing of the transmitted basic data 50 and the basic missing data 51.

  Thus, the periodic authentication information 41 is sent to the periodic authentication information transmission processing unit 67 by checking the history information 52 for each data amount corresponding to the reproduction time of the content 10 to be synthesized. Can be promptly instructed to be transmitted to the content distribution apparatus 106.

  That is, the separated data composition processing unit 166 determines how much reproduction time the data amount corresponds to when the basic data 50 transmitted by one transmission process is combined with the basic missing data 51 in advance. Information is set.

  That is, in the separated data composition processing unit 166, the content 10 synthesized based on the basic data 50 transmitted at a time from the content distribution device 106 has a data amount corresponding to, for example, a reproduction time of 2 minutes. Is set.

  Therefore, every time the basic data 50 is received, the separated data composition processing unit 166 needs to check the data amount for a predetermined time (for example, two minutes) from the history information 52 and request further transmission of the basic data 50. Determine whether or not. When it is determined that further basic data 50 needs to be transmitted, the separated data composition processing unit 166 performs the periodic authentication information during the composition process of the received basic data 50 and the basic missing data 51. The transmission processing unit 67 can be instructed to transmit periodic authentication information.

  As described above, the separated data composition processing unit 166 can instruct the periodic authentication information transmission processing unit 67 to transmit the next periodic authentication information 41 during the composition process of the basic data 50 and the basic missing data 51. Therefore, the composition process of the basic data 50 and the basic missing data 51 can be continuously performed and transmitted to the content decryption processing unit 68.

  Therefore, the content decryption processing unit 68 temporarily stores the decrypted content 10 so that the video is not interrupted, and there is no need to delay the output of the content 10 converted into reproduction data to the information input / output unit. .

  For this reason, the content distribution processing system 1 according to the present embodiment includes the content distribution device 106 shown in FIG. 15 and the content acquisition processing device 108 shown in FIG. There is no need to provide a large-capacity buffer for temporarily storing the reproduction data of the content 10 output to the output processing unit 62.

  In the content distribution processing system 1 according to the present embodiment, the content acquisition processing device 8 shown in FIG. 7 may be the content acquisition processing device 208 having the configuration shown in FIG. In FIG. 17, the same members as those shown in FIG. 7 are denoted by the same reference numerals, and description of similar members is omitted.

  That is, the content acquisition processing device 208 shown in FIG. 17 differs from the content acquisition processing device 8 shown in FIG. 7 in the following points.

  In other words, the content acquisition processing device 208 is different from the configuration of the content acquisition processing device 8 shown in FIG. 7 in that a composite data monitoring processing unit 80 is further provided.

  The synthesized data monitoring processing unit 80 monitors the result of decryption processing of the content 10 synthesized by the separated data synthesis processing unit 66. That is, the composite data monitoring processing unit 66 confirms the state of the content 10 compressed and decompressed by the content decryption processing unit 68. When it is determined that the basic data 50 and the basic missing data 51 transmitted from the content distribution device 6 are combined for a predetermined time and converted into reproduction data, the periodic authentication information transmission processing unit 67 is notified of the following. Instructing transmission of the periodic authentication information 41 in order to request transmission of the basic data 50.

  As described above, the content acquisition processing device 208 includes the composite data monitoring processing unit 80. Therefore, the content acquisition processing device 208 confirms the portion that has been normally combined and converted into the reproduction data, and periodically transmits the periodic authentication information 41. The authentication information transmission processing unit 67 can be instructed.

  Further, when the periodic authentication information 41 is determined according to each divided basic data 50 transmitted from the content distribution device, the composite data monitoring processing unit 80 combines the basic data 50 and the basic missing data 51. If it is determined that the partial decryption process is not normally performed, it is possible to instruct to transmit the periodic authentication information 41 for requesting the transmission of the same basic data 50 again.

  Furthermore, in the content distribution processing system 1 according to the present embodiment, the content acquisition processing device 308 (FIG. 18) having a configuration in which the content distribution device 106, the content acquisition processing device 108, and the content acquisition processing device 208 are combined. For example).

  18 includes the composite data monitoring processing unit 80 of the content acquisition processing device 208 shown in FIG. 17 in the configuration of the content acquisition processing device 108 shown in FIG. It is a configuration. For this reason, description of each part with which the content acquisition processing apparatus 308 is provided is abbreviate | omitted.

  As described above, the content distribution device 6 included in the content distribution processing system 1 is the content distribution device 106 having the configuration shown in FIG. 15, and the content acquisition processing device 8 is the content acquisition processing device 308 shown in FIG. Data 50 and basic missing data 51 can be continuously synthesized and decoded. In addition, it is possible to confirm whether or not the synthesis and decoding processing of the basic data 50 and the basic missing data 51 is normally performed.

  Further, the content distribution processing system 1 according to the present embodiment is configured such that the content providing server 2 and the user terminal 3 are communicably connected through a communication network. However, the content providing server 2 and the user terminal 3 may be integrated into a single device.

  More specifically, the content distribution device 6 and the content acquisition processing device 8 can be configured as one device as shown in FIG. 21 (content viewing device 15). That is, the content viewing device 15 is configured to include each member included in the content distribution device 6 and each member included in the content acquisition processing device 8.

  However, in the content viewing apparatus 15, it is not necessary to transmit / receive information through the communication network 4 between the content distribution apparatus 6 and the content acquisition treatment apparatus 8 unlike the content distribution processing system 1.

  For this reason, it is not necessary to provide the encryption processing part 31, the basic data transmission part 32, the basic missing data transmission part 34, and the periodic authentication information reception part 25 among the members with which the content delivery apparatus 6 is provided. Of the members included in the content acquisition processing device 8, it is not necessary to include the content request processing unit 60, the authentication information transmission processing unit 61, the basic data receiving unit 63, the basic missing data receiving unit 64, and the encryption / decryption processing unit 65. .

  That is, in the content viewing device 15, the content request reception processing unit 23 receives the transmission request for the content 10 instructed by the user by operating the input / output device 9 without using the content request processing unit 60. Then, the content request acceptance processing unit 23 causes the input / output device 9 to display a message for confirming the use of the content 10 via the information input / output processing unit 62 or displays the content list information 40 to select the desired content 10 for the user. I will let you.

  The authentication information input by the user is received by the authentication information receiving unit 24 and passed to the user authentication unit 26. Then, the user authentication unit 26 compares the authentication information input by the user with the authentication information 42 stored in the information storage unit 22 and authenticates whether or not the user is an authorized user.

  If it is determined that the periodic authentication process needs to be performed, the periodic authentication information transmission processing unit 67 transmits the periodic authentication information 41 to the user authentication unit 26. The periodic authentication information 41 is not previously stored in the user information storage unit 69 by the user as in the content acquisition processing device 8. That is, in the content viewing apparatus 15, when the authentication information 42 is input by the user, the periodic authentication information 41 is also input. In the content viewing apparatus 15, the user information storage unit 69 temporarily stores the periodic authentication information 41 input by the user.

  When the user authentication unit 26 determines that the user who requests the content is a legitimate user, the basic data acquisition unit 30 separates a predetermined amount of the basic data 10 of the content 10 desired by the user. The data is transmitted to the data composition processing unit 66. In addition, when the user authentication unit 26 periodically determines that the user who requests the content is recognized as an authorized user as the content acquisition destination, the remaining basic data 10 of the content 10 is determined by a predetermined amount. The data is transmitted to the separated data configuration processing unit 66 one by one.

  On the other hand, when the user authentication unit 26 determines that the user requesting the content is a legitimate user, the basic missing data acquisition unit 33 synthesizes the basic missing data of the content 10 desired by the user with the separated data composition. The data is transmitted to the processing unit 66.

  In addition, in each member with which the content viewing apparatus 15 is provided, the same code | symbol is attached | subjected about the member similar to each member with which the content delivery apparatus 6 and the content acquisition processing apparatus 8 are provided, and description of each part is abbreviate | omitted.

  As described above, the content viewing apparatus 15 separates the content 10 desired by the user into the basic data 50 and the basic missing data 51, and performs the periodic authentication process using the separated basic data 50, while the content 10 is received by the user. Can be provided. That is, the content viewing apparatus 15 can provide the content 10 while confirming whether or not the user is a regular acquisition source of the content 10.

  Further, since the content 10 is stored separately in the information storage unit 22 into basic data and basic missing data, it is transmitted from the information storage unit 22 itself or from the information storage unit 22 to the separated data composition processing unit 66. It is possible to prevent the content 10 from being intercepted by a third party and being illegally used in the route.

  The content viewing device 15 is configured to acquire each content 10 from the content management server 5, separate the content 10 into basic data 50 and basic missing data 51, and store them in the information storage unit 22. However, in the content viewing apparatus 15, the basic data 50 and the basic missing data 51 of each content 10 are recorded by a recording medium such as a memory card that stores the basic data 50 and the basic missing data 51 corresponding to the basic data 50 separately. It can also be set as the structure which acquires.

  Thus, when the content viewing apparatus 15 is configured such that the basic data 50 and the basic missing data 51 are rejected by the respective recording media, the following advantages are obtained. That is, a person who provides the content 10 can provide the content viewing apparatus 15 with the basic data 50 and the basic missing data 51 separately. Therefore, when the content 10 is provided to the content viewing device 15, it is possible to prevent the content 10 from being tapped by a third party and used illegally.

  Note that the units included in the content distribution devices 6 and 106, the content acquisition processing devices 8, 108, 208, and 308, and the content viewing device 15 described above may be configured by hardware logic. In addition, each unit and each processing step of the content distribution device 6/106, the content acquisition processing device 8, 108/208/308, and the content viewing device 15 is performed by a calculation unit such as a CPU such as a ROM (Read Only Memory) or a RAM. It can also be realized by executing a program stored in the storage means and controlling input means such as a keyboard, output means such as a display, or communication means such as an interface circuit.

  Therefore, the content distribution device, the content acquisition processing device 8, 108, 208, and the content viewing device of the present embodiment can be obtained simply by a computer having these means reading the recording medium on which the program is recorded and executing the program. Fifteen functions and processes can be realized.

  In addition, by recording the program on a removable recording medium, the various functions and various processes described above can be realized on an arbitrary computer.

  As the recording medium, a memory (not shown) such as a ROM may be used as a program medium for processing by the microcomputer, and a program reader is provided as an external storage device (not shown). It may be a program medium that can be read by inserting a recording medium therein.

  In any case, the stored program is preferably configured to be accessed and executed by the microprocessor. Furthermore, it is preferable that the program is read out, and the read program is downloaded to the program storage area of the microcomputer and the program is executed. It is assumed that the download program is stored in the main device in advance.

  The program medium is a recording medium configured to be separable from the main body, such as a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as a flexible disk or a hard disk, or a disk such as a CD / MO / MD / DVD. Fixed disk system, card system such as IC card (including memory card), or semiconductor memory such as mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), flash ROM, etc. In particular, there are recording media that carry programs.

  In addition, if the system configuration is such that the communication network 4 including the Internet can be connected, the recording medium is preferably a recording medium that fluidly carries the program so as to download the program from the communication network 4.

  Further, when the program is downloaded from the communication network 4 in this way, it is preferable that the download program is stored in the main device in advance or installed from another recording medium.

  In the content distribution processing system 1, as described above, the content providing server 2 includes the content management server 5 and the content distribution device 6, and the content distribution device 6 is communicably connected to the user terminal 3 through the communication network 4. However, the present invention is not limited to this.

  In particular, each unit included in the content distribution device may be a single device, and each device may be connected by the communication network 4. For example, as illustrated in FIG. 19, as an example, the content information encoding device 520, the basic data extraction device 521, the information storage device 522, and the authentication management server 523 may be configured as a system.

  Note that the content information encoding device 520 and the basic data extraction device 521 are devices having the same functions as the content information encoding unit 20 and the basic data extraction unit 21 included in the content distribution device 6. Description is omitted.

  The information storage device 522 is a device that receives and stores the basic data 50 and the basic missing data 51 transmitted from the basic data extraction device 521. Further, the basic data 50 and the basic missing data 51 are transmitted to the authentication management server 523 in response to a transmission request for the basic data 50 and the basic missing data 51 from the authentication management server 523. The basic data 50 and the basic missing data 51 stored in the information storage device 522 are the same as the basic data 50 and the basic missing data 51 stored in the information storage unit 22 included in the content distribution device 6, and thus description thereof is omitted.

  The authentication management server 523 includes a management server information storage unit 524, a content request reception processing unit 23, an authentication information reception unit 24, a periodic authentication information reception unit 25, a user authentication unit 26, a basic data transmission processing unit 27, and basic missing data. A transmission processing unit 28 is provided. Among these units, the content request acceptance processing unit 23, the authentication information receiving unit 24, the periodic authentication information receiving unit 25, the user authentication unit 26, the basic data transmission processing unit 27, and the basic missing data transmission processing unit 28 are used for content distribution. Similar to the content request reception processing unit 23, the authentication information receiving unit 24, the periodic authentication information receiving unit 25, the user authentication unit 26, the basic data transmission processing unit 27, and the basic missing data transmission processing unit 28 provided in the device 6. Therefore, the description is omitted and the same reference numerals are given.

  The management server information storage unit 524 is a readable / writable recording medium similar to the information storage unit 22 included in the content distribution device 6, and includes content list information 40, authentication information 42, and periodic authentication information 41. The content list information 40, the authentication information 42, and the periodic authentication information 41 are the same as the content list information 40, the authentication information 42, and the periodic authentication information 41 stored in the information storage unit 22 of the content distribution device 6. Therefore, description is abbreviate | omitted and the same code | symbol is attached | subjected.

  As described above, the content distribution device 6 according to the present embodiment can be configured as a system in which the above-described devices are communicably connected via the communication network 4.

  Alternatively, the content distribution device 6 may be a system in which the devices described above are directly connected using a PC card or the like instead of the communication network 4.

Or
In addition, this invention is not limited to embodiment mentioned above, A various change is possible in the range shown to the claim. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  The content distribution apparatus according to the present embodiment can transmit content to the content acquisition processing apparatus separately into basic data and basic missing data, and wiretapping by a third party such as a communication network is expected. It can be widely applied to data transmission through a communication path.

1, showing an embodiment of the present invention, is a block diagram illustrating a main configuration of a content distribution apparatus. FIG. 1, showing an embodiment of the present invention, is a block diagram illustrating a main configuration of a content distribution processing system 1. FIG. FIG. 4 is a diagram illustrating an embodiment of the invention and illustrating a relationship between data transmitted and received between a content distribution device and a content acquisition processing device. It is a figure which shows the relationship between a content and the divided | segmented basic data. It is a figure which shows the luminance information before and after compression about 1 frame which comprises the content which is moving image data. It is a figure which shows embodiment of this invention and shows an example of element specific information. 1, showing an embodiment of the present invention, is a block diagram illustrating a main configuration of a content acquisition processing apparatus. FIG. 5 is a flowchart illustrating an example of content request and transmission processing according to the embodiment of this invention. It is a flowchart which shows the authentication process in the content delivery processing system which concerns on embodiment of this invention. It is a flowchart which shows the content request process in the content delivery processing system which concerns on embodiment of this invention. It is a flowchart which shows the transmission process of the content 10 requested | required from the user terminal in the content delivery processing system which concerns on embodiment of this invention. It is a block diagram which shows the outline of the content transmission process in the content delivery processing system which concerns on embodiment of this invention. It is a block diagram which shows the comparative example of the content transmission process in the content delivery processing system which concerns on embodiment of this invention. It is a flowchart which shows the periodical authentication process in the content delivery processing system which concerns on embodiment of this invention. It is a block diagram which shows another structure of the content delivery apparatus of the content delivery processing system which concerns on embodiment of this invention. It is a block diagram which shows another structure of the content acquisition processing apparatus of the content delivery processing system which concerns on embodiment of this invention. It is a block diagram which shows another structure of the content acquisition processing apparatus of the content delivery processing system which concerns on embodiment of this invention. It is a block diagram which shows another structure of the content acquisition processing apparatus of the content delivery processing system which concerns on embodiment of this invention. It is a block diagram which shows the case where the content acquisition processing apparatus of the content delivery processing system which concerns on embodiment of this invention is comprised as a system. It is a block diagram which shows a prior art and shows the transmission process of a content. It is a block diagram which shows the principal part structure of the content viewing-and-listening apparatus which concerns on embodiment of this invention.

Explanation of symbols

1 Content distribution processing system (data transmission system)
6 Content distribution device (data transmission device)
8 Content acquisition processing device (information processing device)
10 Content (data)
11 Element specific information 12 Partial data 21 Basic data extraction part (extraction means)
26 User authentication part (determination means)
27 Basic data transmission processing unit (basic data transmission means)
28 Basic missing data transmission processing unit (missing data transmission means)
31 Encryption processing part (encryption means)
41 Periodic authentication information (user identification information)
50 Basic data 51 Basic missing data (missing data)
63 Basic data receiving unit (basic data receiving means)
64 Basic missing data receiver (missing data receiving means)
66 Separated data composition processing unit (composition means)
67 Periodic authentication information transmission processing unit (user identification information transmission means)
69 User information storage (storage device)

Claims (9)

A data transmitting device that transmits data to an information processing device that requests data transmission,
Part of the elements constituting the data, including partial data including information necessary for reproducing the data as significant information, and which element of the data the partial data is Extraction means for extracting basic data including element specifying information for enabling the information processing apparatus to specify, from the data;
Basic data transmission means for transmitting the basic data extracted by the extraction means to the information processing apparatus;
A data transmission apparatus comprising: missing data transmission means for transmitting missing data, which is residual data obtained by extracting basic data from the data by the extraction means, to the information processing apparatus. A compression means for encoding and compressing the data;
The partial data is information obtained from the data encoded by the compression means, and includes data necessary for normal reproduction of the data compressed by the information processing apparatus. The data transmission apparatus according to claim 1, wherein The above data has information in the time axis direction,
The basic data transmitting means transmits the basic data extracted from the data every predetermined time in the data in the reproduction order of the data,
A receiving unit that periodically receives user identification information, which is information for identifying a user of the information processing device, from the start of transmission of basic data by the basic data transmission unit;
Determination means for determining whether the user of the information processing apparatus is a regular transmission destination as the transmission destination of the data based on the user identification information received by the reception means;
3. The basic data transmitting unit transmits the basic data in the next reproduction order when the determining unit determines that the user is a regular transmission destination of data. The data transmission device described.   4. The data transmission apparatus according to claim 3, wherein the basic data transmission means includes encryption means for encrypting the basic data to be transmitted to the information processing apparatus. A data transmission system comprising the data transmission device according to any one of claims 1 to 4, and an information processing device that requests the data transmission device to transmit data,
The information processing apparatus is
Part of the elements constituting the data, including partial data including information necessary for reproducing the data as significant information, and which element of the data the partial data is Basic data receiving means for receiving basic data including element specifying information for enabling identification from the data transmitting device;
Missing data receiving means for receiving from the data transmitting device missing data obtained by extracting the basic data from the data;
A data transmission comprising: combining means for combining the basic data received by the basic data receiving means and the missing data received by the missing data receiving means based on element specifying information included in the basic data system. A data transmission system comprising the data transmission device according to claim 3 and an information processing device that requests the data transmission device to transmit data,
The above data has information in the time axis direction,
The information processing apparatus is
Basic data receiving means for receiving basic data extracted from data every predetermined time in the data from the data transmitting device;
A missing data receiving means for receiving the missing data from the data transmitting device;
Combining means for combining the basic data received by the basic data receiving means and the missing data received by the missing data receiving means based on element specifying information included in the basic data;
A storage device for storing the user identification information;
A user specifying information transmitting unit configured to transmit the user specifying information stored in the storage device to the data transmitting device when combining the basic data and the missing data by the combining unit; A data transmission system characterized by that. A data transmission device control method for controlling a data transmission device that transmits data to an information processing device that requests data transmission,
Part of the elements constituting the data, including partial data including information necessary for reproducing the data as significant information, and which element of the data the partial data is Extracting basic data including element specifying information for enabling the information processing apparatus to specify from the data;
Transmitting the basic data extracted by the extracting means to the information processing apparatus;
And a step of transmitting to the information processing apparatus missing data, which is residual data obtained by extracting the basic data from the data by the extracting means.   A control program for operating the data transmission device according to any one of claims 1 to 4, wherein the control program for the data transmission device causes a computer to function as each of the means.   A computer-readable recording medium on which the control program for the data transmission device according to claim 8 is recorded.

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