JP2000324166A - Content directory system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retrieve the contents of video, music, etc., on the basis of identification information for content management and its attribute information and to find a place on a network where the contents of an original copy exist by the identification information. SOLUTION: A content directory server 1 authenticates a user by using a user authenticating means 12 in response to a content ID issue request from a terminal 2 and issues a content ID. A means 15 which registers and updates the attribute information of the content ID and a means 17 which manages the relation to 2nd ID information of a representation format being different from the representation format of the content ID are provided, and contents are made retrievable by utilizing them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a system for managing registration and update of digital content or attribute information such as copyright thereof.

[0002]

2. Description of the Related Art In recent years, the age of digital content distribution has begun. However, digital content is stored and
Since the quality does not deteriorate even when copying, processing, and transferring are repeated, the processing of the copyright caused by these operations is a serious problem. Until now, there has been no precise method for copyright processing of digital contents, and copyright law or contracts have been used. In the Copyright Law, compensation for digital recording / recording equipment has been institutionalized. Only.

[0003] In such a situation, how to handle the copyright of the digital contents in the database becomes a big problem, but no copyright management means has been completed to date.

For example, Japanese Patent Application Laid-Open No. H11-7241 discloses a digital content management system using a digital watermark.
There are techniques disclosed in Japanese Patent Application Publication No. 008 “Data Content Distribution System” and Japanese Patent Application Laid-Open No. Hei 10-254909 “Data Management System”.

For example, in a digital content management system using a digital watermark disclosed in Japanese Patent Application Laid-Open No. H11-7241,
The digital content management program is incorporated into the operating system of the user device as a microkernel, and a monitoring program or a monitoring command linked to the digital content management program is transmitted to the user device by using a network or data broadcasting to prevent the illegal use of the digital content. Monitor. Visible watermarks are embedded in illegally used digital contents, and subsequent use is suppressed. By embedding an invisible watermark even for regular use, it is possible to confirm the path for copying and transferring. Also, the public key is entered on the public key distribution screen and distributed via a network or broadcast. The public key distribution screen is attached with image information in which the information of the public key owner or the user is embedded as an invisible digital watermark, and the validity of the public key or the user is confirmed using the digital watermark.

In the data contents distribution system disclosed in Japanese Patent Application Laid-Open No. Hei 10-302008, objects are handled as data contents, and data contents are processed by processing the data contents as objects by a processing program. The processed data content is expressed by the original data content and a processing scenario in which the processing content by the processing program is described. Only the encrypted processing scenario is circulated, and the user who has obtained the encrypted processing scenario decrypts the encrypted processing scenario using the encryption key obtained from the key management center, and obtains the original from the database according to the processing scenario. Obtain the data content and reconstruct the processed data content. If there is a person who wants to sell the processing scenario, an auction is conducted and the right to use the processing scenario is sold.

In the data management system disclosed in Japanese Patent Application Laid-Open No. 10-254909, in order to prevent theft or leakage of data contents, a data management center embeds user data in data contents to be supplied to a user as an electronic watermark. Content is supplied after being encrypted with an encryption key. The encrypted data content is decrypted and used using the encryption key from the data management center, and is stored and encrypted using another encryption key. To copy / transfer data content to another user, register a scenario for embedding the user data of another user as a digital watermark in the data management center, and encrypt the data content with the digital watermark embedded with another encryption key. Supply. If the validity of the other user is confirmed in the scenario, another encryption key is delivered to the other user, and the encrypted data content is decrypted and used with the other encryption key. Encrypt. If the data content is illegally copied or transferred, the user can be identified by checking the digital watermark.

[0008]

However, in the prior art described above, the contents such as video or music can be searched based on the identification information for content management and its attribute information, and at the same time, the identification can be performed. It was not possible to know the location on the network where the original content exists from the information.

[0009]

SUMMARY OF THE INVENTION The present invention provides a means for authenticating a user, a means for issuing a content ID which is ID information for a content in response to a user request, and a registration / update of attribute information of the content ID. And a means for managing the relationship between the content ID and the second ID information in an expression format different from the expression format of the content ID, and a means for searching for the content.

Further, the present invention provides a means for authenticating a user, a means for issuing a content ID which is ID information for a content in response to a user request,
A content directory server having means for registering and updating attribute information of the content, means for transmitting and receiving data, and means for searching for content; means for transmitting and receiving data;
A content name server having means for managing the relationship with the second ID information in an expression format different from the expression format may be provided, and these two may share the functions of the system.

The system may have means for creating second ID information in a different expression format based on the content attribute information on the content ID when the content ID is issued or when the registration of the content attribute information is updated. It may be.

The data format of the content ID may include the logical address of the machine in which the content exists and the logical address in the machine. The data format of the content ID may include the user ID and the work in which the content exists. It may be configured to include an ID.

[0013] The second ID information may include a user ID of the content, or the second ID information may include a logical address of a machine where the content exists. .

[0014] When the user is referred to here, the ID is used.
A user who uses the issuance service is also a copyright holder of the content whose ID is to be issued, and may be read as a rights holder ID in that sense. The content ID is ID information for the content, and also has a function as identification information for content management in the system.

[0015]

FIG. 1 is a block diagram of a content directory system. As shown in FIG.
The content directory server 1 and the user terminal 2 are connected via a network 3.

The server control means 11 of the content directory server 1 includes a user authentication means 12, an ID information management means 13, a content ID transmission / reception means 14, a content attribute information registration / update means 15, a content search means 16, It controls the synchronization between the content naming means 17 and the data transmitting / receiving means 18.

The user authentication means 12 is a means for receiving a content ID issuance request from the terminal 2 and authenticating the requester. As the authentication method, any method may be used. For example, a public key cryptosystem using a public key and a secret key may be used. Using the procedure described in Japanese Patent Application Laid-Open No. 10-39752, entitled "Communication and Authentication Method Using Public Key Cryptography, and Their Devices", it is possible to realize high-strength encryption.

The public key cryptosystem described in Japanese Patent Application Laid-Open No. 10-39752 has a strength equal to or higher than that of a conventional public key cryptosystem on a rational integer ring for complete decryption. In order to realize encryption with higher strength against a broadcast attack than before, the key generation device generates prime ideals (p) and (q) in an integer ring O on an algebraic field to generate a first A secret key, and the remainder of the product (n) = (p) (q) is a first public key. Further, a second secret key d and a second public key e are generated from (p) and (q). Encryption apparatus divides the input plaintext M into blocks, ideal a (n) to encrypt the e-th power calculation modulo, ciphertext (C0, C1, ..., C r-1) communication path Output to The decryption device decrypts the input ciphertext block by a d-th power operation modulo ideal (n), integrates the decrypted plaintext blocks, and outputs a plaintext M. There are various other public key cryptosystems, and a detailed procedure thereof is well known, and a detailed description thereof will be omitted.

The content ID transmitting / receiving means 14 receives the user authentication by the user authentication means 12 and receives the content ID.
And transmits and receives content ID information to and from the terminal 2. ID information management means 13
This is a means for managing content ID information issued to an authenticated user in a database in association with the user. The content attribute information registration / updating unit 15 is a unit that registers and updates content attribute information for each content ID in a database based on content attribute information for each content ID received from the terminal 2.

[0020] The content search means 16 stores the content I
This is a means for notifying attribute information of each D or notifying a set of contents that match the search condition when the search condition of the content attribute information is narrowed down. The content naming unit 17 is a unit that manages, as a content ID conversion table 19, a correspondence table between content IDs and second ID information in an expression format different from the expression format of the content IDs. The data transmitting / receiving unit 18 receives a request for acquiring ID information expressed in another expression format of the content ID, and transmits the ID information expressed in another expression format corresponding to the designated content ID via the content naming unit 17. This is a means for obtaining the information and passing it to the requester.

In the terminal 2 shown in FIG. 1, the terminal control means 21 synchronizes the content ID issuance request means 22, the content attribute registration request means 23, the content ID transmission / reception means 24, and the content ID assignment means 25. Control.

The content ID issuance requesting unit 22 requests the content directory server 1 to issue a content ID. The content ID transmitting / receiving means 24 is a means for receiving the content ID issued by the content directory server 1 and transmitting the content ID to the content directory server 1.

The content ID assigning unit 25 assigns a content ID issued by the content directory server 1 to the content. As a method of giving, it is possible to use a method of embedding the content in the main body of the content by a digital watermark or setting a content ID in the header information of the file. For the specific procedure of digital watermarking, see, for example, Japanese Patent Application Laid-Open No.
A procedure described in, for example, Japanese Patent Application Laid-Open No. 145,575, “Method of Inserting and Extracting Digital Watermark” may be used.

In the apparatus described in Japanese Patent Application Laid-Open No. Hei 10-191025, additional embedding of information into image data can be performed safely and reliably in order to promote smooth distribution of image data. For the purpose of making it possible, the processing of the inverse encoding device for restoring the encoded image data to the original image and the processing of the digital watermark insertion device for embedding information in the image data are inseparable, When the original image is restored from the image data, the decoding process is performed by the inverse encoding device, and the information is embedded by the digital watermark insertion device. Embed

Further, the method described in Japanese Patent Application Laid-Open No. H10-145557 aims to improve the reliability by accumulating watermark information in a partial image and extracting the watermark information from the partial image. The processing is performed according to the following procedure. First, the data to be watermarked is divided into a plurality of small areas. The frequency coefficient of the data to be watermarked is calculated for each small area. The watermark signal to be inserted is modulated into a spread spectrum by mapping the watermark signal to a pseudo-random noise sequence. The PN as a function of the average power is spectrally formed into respective frequency coefficients of the data. Then, each spectrum-formed PN sequence is inserted into a predetermined coefficient of the data of each small area. In this way, digital watermarking of data including image, video, and audio data is performed by repeatedly inserting a watermark into a small area or partial image of data. Similarly, the watermark is repeatedly extracted from a small area of the data.

The content attribute registration requesting means 23 is a means for requesting the content directory server 1 to register or update content attribute information relating to the issued content ID, based on the information sent here. In the content naming means 17 of the content directory server 1, a second I of an expression format different from the content ID
D information is created and managed in the database of the content ID conversion table 19. Note that a user authentication unit may be added to the terminal 2.

A part of the functions of the content directory server 1 shown in FIG. 1 can be separated and configured as a content name server. FIG. 2 is a block diagram of a system including a content directory server and a content name server in which the functions of the content directory server 1 of FIG. 1 are separated into two servers.

The function of the content directory server 1 of FIG. 1 is separated from the function of the management of the content ID conversion table 19 and the function of transmitting a response to the inquiry of another expression format of the content ID. The name server 4. The content directory server 1 'after separation includes a server control unit 11', a user authentication unit 12 ', an ID information management unit 13', a content ID transmission / reception unit 14 ', a content attribute information registration / update unit 15', a content search unit 16 'have. These means correspond to the contents directory server 1 shown in FIG.
It has the same function as each of the means 11 to 16 described above.

In the content name server 4, the content name server control means 41 controls the content naming means 42 and the data transmission / reception means 43.
The content naming unit 42 is a unit that manages a content ID conversion table 44, which is a correspondence table between the content ID and second ID information having a different expression format from the expression format of the content ID, in a database or the like. The data transmission / reception means 43 is a means for transmitting / receiving data to / from the content directory server 1 'or the terminal 2, receives a request for acquiring ID information expressed in another expression format of the content ID, and corresponds to the specified content ID. The ID information expressed in another expression format is obtained through the content naming means 42 and passed to the acquisition requester.

Since the basic operation outline is the same for the system shown in FIG. 1 and the system shown in FIG. 2, the content directory server 1 and the terminal 2 shown in FIG.
The case where the pair operates as a pair will be described.

FIG. 3 shows an example of each data structure of user ID information and content attribute information. User ID
The information is identification information (user number) given by the user from an authentication organization for encrypted communication. The content attribute information stores attribute information of the content for each content ID. For example, the registration date, media type (still image, moving image, music, etc.), search classification code 1.
2, 3, and content storage addresses. Here, the content storage address includes, for example, the address of a home page posted so that the content can be browsed, or the communication address of a contact for purchasing the content.

FIG. 4 shows an example of the data structure of the content ID and the contents ID conversion tables 19 and 44 managed by the content naming means 17 of the content directory server 1 or the content naming means 42 of the content name server 4 shown in FIG. Two sets of examples are shown.

The example shown in FIG. 4A is a case where the data format of the content ID is composed of the logical address of the machine where the content exists and the logical address inside the machine. Of course, it may be constituted only by the logical address of the machine. Content ID conversion table 1 in this case
9 (or 44), as shown in the figure, the content IDi includes the user IDi (that is, the right holder IDi),
A pair of work IDi corresponds. Here, the content ID
i may be associated with only the user IDi.

The example shown in FIG. 4B is a case where the data format of the content ID is composed of a user ID (that is, a right holder ID) and a work ID. Content ID
You may comprise only a user ID. In the content ID conversion table 19 (or 44) in this case, as shown in the figure, a pair of the logical address i of the machine where the content exists and the logical address i inside the machine corresponds to the content IDi. Here, only the logical address i of the machine may correspond to the content IDi.

Here, two examples are shown as examples of the structure of the content ID, and how the correspondence relationship between the two types of content IDs is managed in the content ID conversion table 19 (or 44). An example of Ruka was given. Of course, other data formats may be used. The important point is that the correspondence between the second ID information and the content ID in different expression formats is managed by a conversion table or the like, and the second ID information can be extracted when the content ID is designated. Is a point.

Next, an operation example in this embodiment will be described with reference to a content ID registration procedure, a content naming procedure, a content attribute registration procedure, and a content search procedure.

FIG. 5 shows an example of a content ID registration procedure. A content ID issuance request is issued from the content ID issuance request unit 22 of the terminal 2 (step S10), and in response to the request, the user authentication unit 12 authenticates the user who has issued the issuance request based on the user ID information. (S11) If the user is correctly authenticated, the content ID transmitting / receiving means 1
4 issues a content ID (S12) and transmits it to the terminal 2 (S13). Here, as described above, the data format of the content ID may be defined to include a pair of the logical address of the machine where the content exists and the logical address inside the machine or the logical address of the machine.
It may be defined to include a user ID (that is, a right holder ID) and a work ID or a user ID. At this time, the content ID issuing request unit 22 of the terminal 2 may transmit the work ID, the logical address of the machine where the content exists, the logical address inside the machine, and the like to the content directory server 1.

Further, the ID information management means 13 stores the correspondence between the set of the user ID and the issued content ID in the database (S14). Further, the content naming means 17 uses the content ID (for example, the logical address of the machine and the logical address inside the machine) and the second I of an expression format different from the expression format of the content ID.
The correspondence between the D information (for example, the user ID and the work ID) is stored by writing it in the content ID conversion table 19 (S15).

Two examples of the operation of the content naming means 17 will be described. The first example is shown in FIG. 6A. When the data format of the content ID is composed of the logical address of the machine where the content exists and the logical address inside the machine, the user IDi (that is, the right Person I
Di), and receives the work IDi (S20, S2 in FIG. 6)
1), a content ID corresponding to the content IDi
This is written in the conversion table 19 (S22).

The second example is shown in FIG. 6B. In the case where the data format of the content ID is composed of a user ID (that is, a rights holder ID) and a work ID, a machine in which the content exists is provided. And the logical address inside the machine (S30, S31 in FIG. 6), and writes them into the content ID conversion table 19 (S32).

In the terminal 2, the content ID transmitting / receiving means 2
4 receives the content ID (S16 in FIG. 5), and the content ID assigning unit 25 assigns the content ID to the content (S17). When the content ID assignment is completed, the terminal 2 sends a completion notification to the content directory server 1. As for embedding of the content ID by the digital watermark, the digital watermark is embedded by using the fixed key, and before the content ID is added, it is read whether or not the content ID has already been assigned by using the fixed key. If it is already embedded, it may be configured not to perform the assignment.

FIG. 7 shows an example of a content attribute registration procedure. When the content attribute registration requesting unit 23 of the terminal 2 requests registration / update of the content attribute information (S4 in FIG. 7).
0), the user authentication means 12 of the content directory server 1 authenticates the user (S41). If the user is correctly authenticated, the terminal 2 sends the content ID and the attribute information on the content ID to the content directory server 1 (S42). When the content directory server 1 receives this (S43), the content ID and the user ID
Is compared with the content managed by the ID information management means 13 to confirm that the combination matches the management content (S44). When the confirmation is completed, the content attribute information registration / update unit 15 registers or updates the content attribute information related to the content ID (S45).

FIG. 8 shows an example of a content search procedure.
When the content ID transmitting / receiving means 14 of the content directory server 1 receives the content ID from the terminal 2 (S50 in FIG. 8), the content attribute information is transmitted to the terminal 2 (S51). Further, if there is a search request specifying the attribute parameter of the content attribute information from the terminal 2 (S52), the content search means 16 of the content directory server 1 searches for the content that matches the specified condition (S53), and the search result is sent to the terminal. 2 (S5
4). If the processing request for inquiring the ID information in the second expression format of the content ID comes through the data transmitting / receiving means 18, the processing request is sent to the content naming means 1
7, the content naming means 17 refers to the content ID conversion table 19 to obtain ID information in the second expression format, and passes the ID information to the terminal 2 which has requested the processing via the data transmission / reception means 18.

[0044]

According to the present invention, the location on the network where the original content exists can be known from the identification information for content management. It is also possible to search for content based on identification information for content management. In particular, since another expression form of the content ID can be known, the convenience of the user and the convenience of the copyright owner are increased.

[Brief description of the drawings]

FIG. 1 is a block diagram of a content directory system.

FIG. 2 is a block diagram of a system including a content directory server and a content name server.

FIG. 3 is a diagram showing an example of each data structure of user ID information and content attribute information.

FIG. 4 is a diagram showing an example of a data structure of a content ID and a content ID conversion table.

FIG. 5 is a diagram showing an example of a content ID registration procedure.

FIG. 6 is a diagram showing an example of a content naming procedure.

FIG. 7 is a diagram showing an example of a content attribute registration procedure.

FIG. 8 is a diagram showing an example of a content search procedure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 content directory server 11 server control means 12 user authentication means 13 ID information management means 14 content ID transmission / reception means 15 content attribute information registration / update means 16 content search means 17 content naming means 18 data transmission / reception means 19 content ID conversion table 2 terminal 21 Terminal control means 22 Content ID issue request means 23 Content attribute registration request means 24 Content ID transmission / reception means 25 Content ID assignment means

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 1/387 G06F 15/21 Z 5K030 330 9A001 (72) Inventor Kiyoto Tanaka Nishishinjuku-san, Shinjuku-ku, Tokyo No. 19-2 Nippon Telegraph and Telephone Co., Ltd. (72) Inventor Yoshiyoshi Yamanaka 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo F-Term within Nippon Telegraph and Telephone Co., Ltd. 5B017 AA04 AA08 BA05 BA07 BB03 CA16 5B049 AA05 CC01 CC21 EE05 EE07 EE23 GG04 GG07 GG10 5B082 AA13 EA01 EA12 GA02 GC04 5B085 AA08 AC03 AE02 AE13 AE23 AE29 BG03 BG07 5C076 AA14 AA40 5K030 GA15 GA16 HA08 HD09 KA01 EJ03 LD03

Claims (7)

[Claims] 1. A content directory system having a content directory server for managing content as electronic information or attribute information thereof, the content directory server comprising: means for authenticating a user; Means for issuing a content ID, which is ID information for the content, in response to a user request;
Means for registering and updating the attribute information of the content ID;
A content directory system, comprising: means for managing a relationship between the content ID and second ID information having an expression format different from the expression format of the content ID; and means for searching for content. 2. A content directory system comprising a content directory server and a content name server for managing content as electronic information or attribute information thereof, wherein the content directory server authenticates a user. Means for issuing, in response to a user request, a content ID which is ID information for the content, means for registering and updating attribute information of the content ID, means for transmitting / receiving data, and means for searching for content. Wherein the content name server comprises: means for transmitting and receiving data; and means for managing a relationship between the content ID and second ID information having a representation format different from the content ID representation format. Content directory system characterized by the following. And means for generating second ID information in a different expression format based on the content attribute information related to the content ID when the content ID is issued or the registration of the content attribute information is updated. The content directory system according to claim 1 or 2, wherein 4. The data format of the content ID includes a logical address of a machine on which the content exists, or includes a logical address of a machine on which the content exists and a logical address inside the machine. The content directory system according to any one of claims 1 to 3, wherein 5. The data format of the content ID includes a user ID in which the content exists, or is configured to include a user ID in which the content exists and a work ID. The content directory system according to any one of claims 1 to 3. 6. The apparatus according to claim 4, wherein the second ID information includes a user ID in which the content exists, or includes a user ID in which the content exists and a work ID. Content directory system as described. 7. The method according to claim 7, wherein the second ID information includes a logical address of a machine on which the content exists, or includes a logical address of the machine on which the content exists and a logical address inside the machine. 7. The content directory system according to claim 6, wherein: