JP2009058983A - Copyright management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a copyright management system capable of promoting secondary use of contents while eliminating an unexpected disadvantage of a copyright holder.
A copyright management system includes a key management server and a client terminal. The right inheritance logic operation module 72 of the key management server 14 compares the right inheritance condition of the secondary content transmitted from the client terminal 12 with the right inheritance condition read from the license information database 54 by the license information search module 52. Determining whether the secondary content right inheritance condition included in the secondary content registration request satisfies the content right inheritance condition used for generating the secondary content read from the license information database 54. If it is determined that it is satisfied, the resource ID of the secondary content is registered in the license information database 54, and the secondary content can be accessed from a third party.
[Selection] Figure 3

Description

  The present invention relates to a copyright management system.

  A copyright management system for managing the copyright of content distributed on a network is conventionally known. However, conventionally known general copyright management systems prohibit not only illegal use of content but also legitimate secondary use. As a result, the reuse of content and the distribution of reused content have been significantly hindered.

  On the other hand, in Patent Document 1, consideration for the copyright of the original work (material content) and a secondary usage fee are distributed to the original author, and second to the author of the secondary work (secondary content). There has been disclosed a content management system that performs a charging process so that a consideration for the copyright of the next work is distributed. By using such a content management system, it is possible to promote secondary use of content while protecting the copyright of the content.

International Publication WO2003 / 067486

  However, in the content management system according to the above-described conventional technology, the copyright holder of the material content (including secondary content that is secondarily used) is a secondary user of the content (secondary content secondary user). Etc.) and secondary usage methods (including secondary usage methods for secondary content, etc.) cannot be restricted for any reason, and secondary usage of material content is unlimited. There was a problem of being promoted.

  More specifically, the content management system according to the above-described conventional technology has the following features: (1) Even if the copyright holder of the material content does not permit the modification of the material content, the secondary user can use the material content without permission. Secondary content is distributed in the form of permitting modification of the content. (2) Even if the copyright holder of the material content has set the lower limit of the unit price of the material content, the secondary user arbitrarily falls below it Secondary content is distributed by setting a unit price. (3) Even though the copyright holder of the material content restricts the distribution of the material content to amateurs, the secondary user is arbitrarily a professional editor. Inconveniences such as selling material content to the site cannot be resolved. As a result, the copyright holder of the material content (including secondary content used secondarily) may be given an unexpected disadvantage. The phenomenon that the right that the original copyright holder wants to inherit is not inherited by the secondary copyrighted work is called a contradiction of rights inheritance.

  Therefore, the present invention enables the copyright holder of the material content to limit the secondary user and secondary usage method of the content, and as a result, the content holder while eliminating the unexpected disadvantage of the copyright holder. It is an object of the present invention to provide a copyright management system that makes it possible to promote the secondary use of.

  In order to solve the above-described problem, a copyright management system of the present invention is a copyright management system including a client terminal and a key management server, and the client terminal is encrypted and received from a content server. A storage unit for storing content, and a transmission request for a decryption key for decrypting the encrypted content stored in the storage unit, including a use permission condition for using the content The decryption key requesting means to be transmitted to the key management server, the encrypted content is read from the storage means, and the read encrypted content is read from the key management server. The content decrypting means for decrypting the content using the decrypted content and expanding the decrypted content in the working memory; When the decrypted content is expanded in the working memory, the content is encrypted using the re-encryption key transmitted from the key management server together with the decryption key, and the encrypted content is stored in the storage means. Content encryption means, content generation means for generating secondary content using the content decrypted by the content decryption means and expanded in the working memory, and generation of the secondary content generated by the content generation means Secondary content registration request means for transmitting to the key management server a secondary content registration request including identification information of the content used and a right inheritance condition for using the secondary content input by the user The key management server includes a license agreement for using the content. Stores license information storage means for storing rights inheritance conditions for using secondary content generated using the content, a decryption key for decrypting the content, and a re-encryption key for re-encrypting the content When the transmission request transmitted from the key storage means and the client terminal is received, the usage permission condition for the content included in the transmission request and the usage permission condition for the content stored in the license information storage means And the use permission determining means for determining whether the use permission condition of the content included in the transmission request satisfies the use permission condition of the content stored in the license information storage means, and the use The use permission condition of the content included in the transmission request by the permission determination means is the license information rating. In order to re-encrypt the decryption key for decrypting the encrypted content and the content decrypted with the decryption key when it is determined that the license agreement condition of the content stored in the payment unit is satisfied The re-encryption key is read from the key storage means and transmitted to the client terminal, and the decryption key and the re-encryption key are transmitted to the client terminal by the decryption key transmission means. When the secondary content registration request sent from the client terminal and the billing processing means for executing the billing processing is received, the identification information of the content included in the secondary content registration request is a key. The secondary content right inheritance condition included in the secondary content registration request and stored in the license information storage means The secondary content right inheritance condition included in the secondary content registration request is stored in the license information storage means. Right inheritance determination means for determining whether or not the rights inheritance condition of the content used to generate the secondary content is satisfied, and the secondary content included in the secondary content registration request by the right inheritance determination means If it is determined that the rights inheritance condition of the content stored in the license information storage means satisfies the rights inheritance conditions of the content used to generate the secondary content, the rights inheritance condition for using the secondary content is determined. Content registration means for registering the license information in the license information storage means.

  When it is determined that the license agreement for the content transmitted from the client terminal satisfies the license agreement for the content stored in the license information storage unit of the key management server, the key management server sends a decryption key to the client terminal. And the content inheritance condition of the secondary content transmitted from the client terminal is stored in the license information storage means of the key management server. If it is determined that the rights inheritance condition is satisfied, the rights inheritance conditions for using the secondary content are registered in the license information storage means of the key management server for use by others, so that the copyright of the material content can be obtained. The content is limited to other users while limiting the secondary users and secondary usage of the content. It is possible to use the.

  In the copyright management system of the present invention, the license information storage means determines whether or not to charge multiple times when the same content is used multiple times for generating secondary content. First charging control information is included, and the charging processing means performs charging processing when the same content is used a plurality of times for generating secondary content based on the first charging control information. It is preferable to perform it.

  For example, when a certain creator attempts to combine a plurality of contents for secondary use, the plurality of contents may include the same material. In such a case, there is a disadvantage that the creator falls into a breach of having to pay for the copyright of the same material twice. This phenomenon is called content circulation contradiction.

  Based on the first charging control information for determining whether or not to charge multiple times when the same content is used multiple times for generating secondary content, the same content is generated for generating secondary content. Such inconvenience can be solved by executing the billing process in the case of being used multiple times.

  Also, in the copyright management system of the present invention, is the license information storage means charged when content that is copyrighted by the creator of the secondary content is used to generate the secondary content? Second billing control information for determining whether or not the second billing control means is configured to generate the secondary content based on the second billing control information. It is preferable that a charging process is executed when content having copyright is used.

  For example, when a certain creator tries to secondary use a certain content as a material, there may be a case where the content that the user owns copyright (for example, content created by the user before) is included as the material. In such a case, the creator has a disadvantage that he / she falls into a break where he / she has to pay the copyright for himself / herself. Such a phenomenon is also called content circulation contradiction.

  Based on the second charging control information for determining whether or not to charge when the content of which the secondary content creator itself is copyrighted is used to generate the secondary content. Such inconvenience can be solved by executing a billing process in the case where a content whose copyright is owned by the creator of the secondary content is used for generating the content.

  The copyright management system of the present invention enables a copyright holder of material content to allow others to use the content while limiting secondary users, secondary usage methods, consideration for use, etc. of the content. As a result, it is possible to promote secondary use of the content while eliminating the unexpected disadvantages of the copyright owner.

  A copyright management system according to an embodiment of the present invention will be described with reference to the drawings.

  First, the configuration of the copyright management system according to the present embodiment will be described.

  FIG. 1 is a configuration diagram of a copyright management system according to the present embodiment. The copyright management system 10 according to the present embodiment includes a client terminal 12 and a key management server 14 as shown in FIG. Each of the client terminal 12 and the key management server 14 is connected to the Internet 16 and can transmit and receive data to and from each other via the Internet 16. The client terminal 12 can download encrypted content from a content server 18 connected to the Internet 16. The content here includes data of all formats such as still image data, moving image data, music data, text data, and secondary content (source code) produced using these data as materials.

  FIG. 2 is a system configuration diagram of the client terminal 12. Functionally, the client terminal 12 includes a content input port 20, a content storage module 22 (storage means), a resource ID reading module 24, and an encryption key request module 26 (decryption key) as shown in FIG. Request means), user interface 28, license information input / output port 30, encryption key input / output port 32, content decryption module 34 (content decryption means), content production module 36 (content generation means), content encryption Module 38 (content encryption means), content usage monitoring module 40, and license setting module 42 (secondary content registration request means).

  The client terminal 12 is physically configured as a computer system including a CPU, a hard disk, a memory, an input device such as a keyboard and a mouse, an output device such as a display, and a data transmission / reception device such as a modem and a network card. The functions of the functional elements shown in FIG. 2 are realized by installing predetermined computer software.

  FIG. 3 is a system configuration diagram of the key management server 14. Functionally, the key management server 14 has a license information input / output port 50, a license information search module 52, a license information database 54 (license information storage means), and a use execution availability determination module 56 (use availability determination means). An encryption key transmission module 58 (decryption key transmission means), an encryption key database 60 (key storage means), a usage monitoring program transmission module 62, an encryption key input / output port 64, and an accounting processing module 66 (accounting processing means). A customer management database 68, a billing information input / output port 70, a right inheritance logic operation module 72 (right inheritance determination means), a content registration module 74 (content registration means), a license management module 76, and an encryption key generation And module 78.

  The key management server 14 is physically configured as a computer system including a CPU, a hard disk, a memory, an input device such as a keyboard and a mouse, an output device such as a display, and a data transmission / reception device such as a modem and a network card. The functions of the functional elements shown in FIG. 3 are realized by installing predetermined computer software.

  Hereinafter, the components of the client terminal 12 and the key management server 14 will be described in detail.

  1 and 2, when a content download request is transmitted from the client terminal 12 to the content server 18, the content server 18 encrypts it to the client terminal 12 in response to the content download request. Content is sent. The download request for the encrypted content is usually transmitted according to an instruction from the secondary user of the encrypted content. The client terminal 12 receives the encrypted content transmitted from the content server 18 via the content input / output port 20. Here, the header of the encrypted content transmitted from the content server 18 includes a resource ID that is identification information for identifying the content.

  The encrypted content received from the content server 18 is stored in the content storage module.

  The encryption key request module 26 is a request for transmitting a decryption key for decrypting the encrypted content stored in the content storage module 22, and includes a use permission condition for using the content. Is transmitted to the key management server 14. More specifically, the encryption key request module 26 first receives an input of a content use execution instruction from a secondary user of the content via the user interface 28. Here, the input of the content use execution instruction includes specification of secondary use of specific content (for example, specification by an icon) and input of use permission conditions for using the content. Here, the use permission condition of the content is a condition for using the content, such as a condition relating to a use form (viewing permission / denial / modification / distribution / etc.), A condition regarding a user (only amateurs can use, who But it can be used) When receiving the use execution command, the encryption key transmission module 26 transmits a request to read the resource ID of the content specified by the use execution command to the resource ID reading module 24.

  The resource ID reading module 24 searches the encrypted content stored in the content storage module 22 based on the resource ID reading request transmitted from the encryption key request module 26, and is designated by the use execution instruction. The resource ID is read from the header of the read content, and the read resource ID is transmitted to the encryption key request module 26.

  The encryption key request module 26 generates a decryption key transmission request including the resource ID transmitted from the resource ID reading module 24 and the use permission condition received from the secondary user of the content via the user interface 28. It transmits to the key management server 14.

  Returning to FIG. 3, the key management server 14 receives the decryption key transmission request transmitted from the client terminal 12 via the license information input / output port 50.

  When the decryption key transmission request is received by the key management server 14, the license information search module 52 searches the license information database 54 using the resource ID included in the decryption key transmission request as a key, and is specified by the resource ID. Search and read the license agreement for the content.

  FIG. 4 is a configuration diagram of the license information database 54. As shown in FIG. 4, the license information database 54 includes, for each content, a resource ID, copyright holder information, content circulation revocation processing permission identifier, license ID, use permission condition, and right inheritance condition. .

  Here, the content circulation cancellation processing permission identifier is an identifier (first charging control) for determining whether or not to charge multiple times when the same content is used multiple times for generating secondary content. Information) and an identifier (second charging) for determining whether or not to charge when the secondary content creator uses copyrighted content for the generation of the secondary content. Control information). It should be noted that two types of content circulation deletion processing permission identifiers are provided, and whether or not to charge multiple times when the same content is used multiple times for generating the secondary content, and the secondary content for generating the secondary content. It is also possible to independently control whether or not to charge when content for which the creator of the copyright is used is used.

  The license ID is an ID that specifies license conditions including a licensed content, use permission conditions thereof, and right inheritance conditions. In addition, the use permission condition is a condition for using the content, and is related to a use form (viewing permission / denial / modification / distribution permission / etc.) And a user condition (only available to distributors, anyone can use). Yes, etc.) and usage considerations.

  The right inheritance condition is a condition for allowing a third party to use secondary content generated using the content. In particular, the essential condition is a condition that must be observed by the copyright holder of the secondary content when the secondary content generated using the content is used by a third party. In addition, the selection condition is an aspect that may be performed by the copyright holder of the secondary content when the secondary content generated using the content is used by a third party. For example, if a specific example is shown using FIG. 4, when the secondary content generated using the content with the resource ID “0002” is used by a third party, the copyright owner of the secondary content must be assigned to whom. But the secondary content must be viewed for over 500 yen. Further, when the secondary content generated using the content with the resource ID “0003” is used by a third party, the copyright holder of the secondary content distributes the secondary content to a distributor, and costs 50,000 yen. Consideration may be received. The fact that the required condition of the content with the resource ID “0004” is blank indicates that the copyright holder of the secondary content has no obligation to protect (if only the price column is blank, the setting of the price is observed) This means that the selection condition for the content with the resource ID “0002” is left blank by the copyright holder of the secondary content. Means that there are no good mode choices.

  Returning to FIG. 3, when receiving the decryption key transmission request transmitted from the client terminal 12, the use executability determination module 56 stores the content use permission condition and license information database 54 included in the decryption key transmission request. Are compared with the contents use permission conditions of the contents (the contents searched and read by the license information search module 52), and the contents use permission conditions included in the decryption key transmission request are stored in the license information database 54. Judgment is made as to whether or not the usage permission condition of the content is satisfied. When it is determined that the usage permission condition for the content included in the decryption key transmission request does not satisfy the usage permission condition for the content stored in the license information database 54, the usage execution permission determination module 56 The license conditions of the content stored in the license information database 54 are transmitted to the client terminal 12 via the license information input / output port 50. The user of the client terminal 12 refers to the transmitted determination result and the use permission condition of the content stored in the license information database 54, inputs a new use permission condition, and again receives the key from the client terminal 12. It is possible to cause the management server 14 to transmit a decryption key transmission request. In addition, it is possible to design a mechanism in which the process of repetitively correcting in this way is locally processed by the client terminal 12, but even in such a case, it is necessary to design so that the final judgment is performed by the key management server 14. . This is to eliminate the risk of unauthorized processing being performed at the client terminal 12. When it is determined that the use permission condition for the content included in the decryption key transmission request satisfies the use permission condition for the content stored in the license information database 54, the use executability determination module 56 encrypts the determination result. Transmit to the key sending module 58.

The encryption key sending module 58 sends a determination result that the use permission condition of the content included in the decryption key transmission request satisfies the use permission condition of the content stored in the license information database 54 from the use execution determination module 56. Upon receipt, a decryption key for decrypting the encrypted content and a re-encryption key for re-encrypting the content decrypted by the decryption key are generated and recorded in the encryption key database 60, and at the same time, an encryption key input / output The data is transmitted to the client terminal 12 via the port 64. (The encryption key is transmitted in a form protected by SSL or the like.) Here, the encryption key database 60 is used for re-encrypting the decryption key for decrypting the content and the content decrypted by the decryption key. The re-encryption key is stored in time series for each content and for each user.

When the set of the decryption key and the re-encryption key is transmitted from the encryption key transmission module 58 to the client terminal 12, the usage monitoring program transmission module 62 is decrypted with the decryption key and re-encrypted with the re-encryption key. A usage monitoring program for monitoring the usage status of the content is transmitted to the client terminal 12 via the encryption key input / output port 64.

  The charging processing module 66 transmits the set of the decryption key and the re-encryption key to the client terminal 12 by the encryption key transmission module 58 and receives the set of the decryption key and the re-encryption key from the client terminal 12. If the confirmation is obtained, the accounting process is executed. More specifically, when the reception confirmation is obtained, the billing processing module 66 refers to the license information database 54 and determines the billing amount described in the column of the license information database 54 in the license information database 54 as the recipient of the decryption key. The charge amount is added to the income amount information of the person specified by the copyright holder information. Here, information such as the charge amount and the income amount is stored in the customer management database 68. The information such as the charge amount and the income amount is transmitted to an external settlement server (not shown) via the charge information input / output port 70 at the time of update or at regular intervals.

  Here, when a plurality of content decryption keys are requested at one time, the billing processing module 66 refers to the content circulation revocation processing permission identifier in the license information database 54 and executes the following billing processing. That is, when the content circulation cancellation processing permission identifier is Yes, when the same content is used a plurality of times for generating the secondary content, and when the secondary content creator itself creates the secondary content. Stop duplicate billing when copyrighted content is used. Judgment whether or not the same content is used a plurality of times for the generation of the secondary content and whether or not the content for which the creator of the secondary content is copyrighted is used for the generation of the secondary content , Referring to the license ID in the license information database 54, whether the decryption key of the content having the same license ID is requested redundantly, and the content having the license ID for which the creator of the secondary content itself has the copyright This is done depending on whether a decryption key is requested.

  Returning to FIG. 2, when the set of the decryption key and the re-encryption key is received by the client terminal 12 via the encryption key input / output port 32, the content decryption module 34 encrypts from the content storage module 22. The encrypted content is read, the read encrypted content is decrypted using the decryption key transmitted from the key management server 14, and the decrypted content is expanded in the working memory. Note that after the content is decrypted, the decryption key used for decryption is discarded.

  When the content decrypted by the content decryption module 34 is expanded in the working memory, the content encryption module 38 re-encrypts the content using the re-encryption key transmitted from the key management server 14 together with the decryption key. The re-encrypted content is stored in the content storage module 22.

  The content production module 36 generates secondary content using the content decrypted by the content decryption module 34 and expanded in the working memory. More specifically, the content creation module 36 executes content processing processing, multiple content combining processing, and the like based on instructions input from the user via the user interface 28 to generate secondary content. To do. The secondary content is composed of a source file in which the content content processing and composition processing executed by the secondary content creator is described.

  The content usage monitoring module 40 is configured by executing a usage monitoring program transmitted from the key management server 14. The content usage monitoring module 40 monitors the usage status of the content decrypted with the decryption key and re-encrypted with the re-encryption key. That is, the content usage monitoring module 40 determines whether or not the content used for generating the secondary content is not used against the above-mentioned license agreement when the content production module 36 generates the secondary content. Monitor. When secondary content is generated by the content production module 36, if it is found that the content used for generating the secondary content has been used contrary to the above-mentioned usage permission conditions, the content usage monitoring module 40 Both the secondary content and the content used for generating the secondary content are discarded. Further, even when a change is found in the content usage monitoring program itself, the content usage monitoring module 40 discards both the secondary content and the content used for generating the secondary content.

  The license setting module 42 uses the resource ID (identification information) of the content (hereinafter referred to as “material content”) used to generate the secondary content generated by the content creation module 36 and the desired usage of the secondary content. A secondary content registration request including permission conditions and rights inheritance conditions is transmitted to the key management server 14. The use permission condition and the right inheritance condition are input via the user interface 28 when the creator of the secondary content wants to distribute the secondary content.

Returning to FIG. 3, when the key management server 14 receives the secondary content registration request via the license information input / output port 50, the license information search module 52 includes the resource of the material content included in the secondary content registration request. The license information database 54 is searched using the ID as a key, and the right inheritance condition of the content specified by the resource ID is searched and read.
The right inheritance logical operation module 72 calculates a logical product of the use permission condition included in the secondary content registration request transmitted from the client terminal 12 and the right inheritance conditions of all the material contents read out by the above processing. It is determined whether or not the secondary content use permission condition is satisfied without contradiction.
If it is determined that the use permission condition is not satisfied, the right inheritance logical operation module 72 sends the determination result and the logical product (indicating the range where the use permission condition is satisfied) to the license information input port 50. To the client terminal 12.
The user of the client terminal 12 can correct the use permission condition with reference to the determination result and the logical product, and send back a new secondary content registration request.
The professional profile that is repeatedly corrected in this way can be designed to be processed locally by the client terminal 12, but even in that case, the final judgment must be designed to be performed by the key management server 14. I must. This is to eliminate the risk of unauthorized processing being performed at the client terminal 12.

  Next, the right inheritance logic operation module 72 is read from the license information database 54 by the right inheritance condition and license information search module 52 of the secondary content included in the secondary content registration request transmitted from the client terminal 12. The rights inheritance conditions of the content used for generating the secondary content read from the license information database 54 are compared with the rights inheritance conditions, and the rights inheritance conditions of the secondary content included in the secondary content registration request are read. Judge whether all the conditions are satisfied.

  More specifically, the right inheritance logical operation module 72 (1) is a case where the essential condition of the right inheritance condition of the material content is designated, and the essential condition is included in the secondary content registration request. If the condition is included as an indispensable condition, registration of the secondary content is permitted, and (2) there is no specification in the essential condition of the rights inheritance condition of the material content, and there is a specification in the selection condition. When the essential condition or selection condition included in the secondary content registration request is within the range of the material content selection condition, the secondary content registration is permitted, and (3) the above (1) and In cases other than (2), registration is refused.

For example, in FIG. 4, the content with the resource ID “0002” has an essential condition of the right inheritance condition “viewing [everyone ≧ ¥ 500]”. In this case, the secondary content creator cannot register the secondary content unless a license is set so that anyone can view the content for 500 yen or more. Also, for example, in FIG. 4, when creating secondary content from the content of resource ID “0003” and resource ID “0004”, there is no contradiction if the license setting is as shown in the right inheritance condition of resource ID “0005”. It can be established. This is because “viewing”, which is a use permission condition for the license “X0001”, is designated as an indispensable condition in the license “A0001” and a selection condition in the license “C0001”. This is because the license “A0001” is not specified and the license “C0001” is 300 yen, so there is no contradiction. On the other hand, “reorganization” specified as a selection condition in the license “C0001” is inherited by the license “X0001” because it is not specified as either a mandatory condition or a selection condition in the license “A0001”. Absent.
As for “distribution”, the license “A0001” and the license “C0001” are both designated as selection conditions, and the “distributor” designated as the distribution target in the license “A0001” is designated by the license “C0001”. It is included in the category of “Anyone”, and the license contents are both “billing”. The license “A0001” should be sold for more than 50000 yen, and the license “C0001” should be sold for more than 1000 yen, so it should be established without contradiction. . Nevertheless, there is no designation in the use permission condition of the license “X0001” because Y and A did not select the right.

  When the registration of the secondary content is rejected, the right inheritance logical operation module 72 sends the determination result and the rights inheritance conditions of the material content stored in the license information database 54 via the license information input / output port 50 to the client. Transmit to the terminal 12. The user of the client terminal 12 refers to the transmitted determination result and the rights inheritance condition of the material content stored in the license information database 54, inputs a new rights inheritance condition, and again receives the key from the client terminal 12. The management server 14 can transmit a secondary content registration request. In addition, it is possible to design a mechanism in which the process of repetitively correcting in this way is locally processed by the client terminal 12, but even in such a case, it is necessary to design so that the final judgment is performed by the key management server 14. . This is because the client terminal 12 eliminates the risk of unauthorized processing. When the rights inheritance condition for the secondary user is determined in this way, the rights inheritance logic operation module 72 permits registration of the secondary content. When the secondary content registration is permitted, the right inheritance logic operation module 72 transmits the determination result to the content registration module 74.

  The content registration module 74 determines that the rights inheritance conditions of the secondary content included in the secondary content registration request satisfy the rights inheritance conditions of the material content stored in the license information database 54 by the rights inheritance logical operation module 72. If so, the resource ID and license ID of the secondary content are generated, the resource ID of the secondary content, the copyright holder information, the content circulation revocation processing permission identifier, the license ID, the use permission condition, and the right inheritance condition Is registered in the license information database 54 and is accessible from a third party.

  When the secondary content resource ID, copyright holder information, content circulation revocation processing permission identifier, license ID, use permission condition, and right inheritance condition are registered in the license information database 54, the encryption key generation module 78 An encryption key for encrypting the secondary content is generated, the generated encryption key is stored in the encryption key database 60, and the encryption key and the resource ID of the secondary content are transmitted via the encryption key input / output port 64. To the client terminal 12.

  Note that the license management module 76 performs update management of the license information database 54.

  Returning to FIG. 2, when the secondary content resource ID and the secondary content encryption key are received from the key management server 14, the content encryption module 38 of the client terminal 12 uses the encryption key to store the secondary content. The encrypted secondary content is registered in the content storage module 22 with the resource ID attached to the header. Also, the encrypted secondary content is uploaded from the client terminal 12 to the content server 18 with the resource ID attached to the header, and is used by a third party.

  Hereinafter, processing when secondary usage of secondary content (hereinafter referred to as “tertiary usage”) is performed will be described. First, the encrypted secondary content is downloaded from the content server 18 to the client terminal 12 according to an instruction from a person who performs tertiary usage (tertiary user). The downloaded secondary content is stored in the content storage module 22 of the client terminal 12. Here, a resource ID is attached to the header of the secondary content stored in the content storage module 22.

  Subsequently, a transmission request for a decryption key including a secondary content use execution command and a secondary content resource ID input by a secondary user of the secondary content is transmitted to the key management server 14.

  In the key management server 14, when the transmission request is received, the license information search module 52 searches for the use permission condition for the secondary content corresponding to the resource ID.

  Thereafter, the use execution permission determination module 56 compares the retrieved use permission condition of the secondary content with the content (use permission condition) of the secondary content use execution instruction by the tertiary user, and determines whether or not the execution is possible. . When the determination result is NO, the use execution permission determination module 56 transmits the result to the client terminal 12. In this case, the tertiary user can modify the usage execution command and retransmit the decryption key transmission request as many times as necessary until a satisfactory result is obtained. In addition, it is possible to design a mechanism in which the process of repetitively correcting in this way is locally processed by the client terminal 12, but even in such a case, it is necessary to design so that the final judgment is performed by the key management server 14. . This is because the client terminal 12 eliminates the risk of unauthorized processing.

  On the other hand, when the determination result is acceptable, the encryption key transmission module 58 transmits a set of a decryption key and a re-encryption key corresponding to the resource ID to the client terminal 12. At the same time (more precisely, when reception confirmation of the decryption key and the re-encryption key is obtained from the client terminal 12), the charging processing module 66 executes the charging processing for the secondary content.

  In the client terminal 12, the content decryption module 34 uses the received decryption key to decrypt the secondary content. The decrypted secondary content is expanded in the working memory.

  When the secondary content is decrypted and expanded in the working memory, the encryption key request module 26 decrypts the content including the resource ID of the material content recorded in the secondary content and the content created by the secondary user. Is transmitted to the key management server 14.

  When the decryption key transmission request is received, the encryption key sending module 58 of the key management server 14 transmits a set of the decryption key and the re-encryption key corresponding to the resource ID to the client terminal 12.

  In the key management server 14, the charging processing module 66 executes charging processing related to the material content and the secondary user's creative content based on the transmission of the decryption key. However, if the original author of the material content specifically desires, the following exemption processing can be selected.

  (1) If the content created by the tertiary user is included in the material content as a material, billing is stopped. For example, in FIG. H. Tries to use the content of the resource ID “0005” for the third time, and if the content of the resource ID “0003” created by himself / herself is included as the material content, charging can be avoided for that portion. However, as shown in the resource ID “0006”, if Y, A, are set to the content circulation deletion processing permission identifier wp “No”, the charge exemption processing related to the current tense of the license “X0001” is executed. Not.

  (2) When a plurality of contents having the same license ID are included in the material content, the charging process is executed only for the content with the first resource ID, and the charging process is stopped for the other contents. . For example, in FIG. F. Synthesizes and processes the secondary content with the resource ID “0005” and the content with the resource ID “0001” to produce the tertiary content. The secondary content with the resource ID “0005” includes the resource ID “0003”. "Was included as material content. Here, both the content with the resource ID “0001” and the content with the resource ID “0003” have the license ID “A0001”. In this case, the charging process is executed only for the content with the resource ID “0001”, and the charging process is stopped for the content with the resource ID “0003”. By such processing, Y.R. F. Can avoid double billing for the same content. However, as shown in the resource ID “0006”, when Y, A, and the content circulation deletion processing permission identifier are set to “No”, the charge exemption processing regarding the content of the license “X0001” is not executed. .

  When the client terminal 12 receives the decryption key of the material content and the secondary user's creative content from the key management server 14, the material content or the encrypted content stored in the content storage module 22 is re-encrypted. The content created by the secondary user and stored is decrypted by the content decryption module 34 and expanded in the working memory, and the secondary content is restored using the material content and the content created by the secondary user. . When the material content or the secondary user's creative content is decrypted and expanded in the working memory, the encryption key used for the decryption is discarded, and the material content or the secondary user's creative content is It is re-encrypted with the encryption key and stored in the content storage module 22.

  The restored secondary content is processed and corrected by the content creation module 36 or synthesized with the content created by the tertiary user.

  Next, the operation and effect of the copyright management system according to this embodiment will be described. The copyright management system 10 according to the present embodiment determines that the usage permission condition for the content transmitted from the client terminal 12 satisfies the usage permission condition for the content stored in the license information storage database 54 of the key management server 14. In this case, the key management server 14 transmits a decryption key to the client terminal 12 to use the content. Further, when the rights inheritance condition of the secondary content transmitted from the client terminal 12 satisfies the rights inheritance condition of the material content used for generating the secondary content stored in the license information database 54 of the key management server 14. If it is determined, the right inheritance condition for using the secondary content is registered in the license information database 54 of the key management server and used for others. Accordingly, it becomes possible for the copyright holder of the material content to allow others to use the content while limiting the secondary users and secondary usage methods of the content. As a result, it is possible to promote secondary use of content while eliminating the unexpected disadvantage of the copyright holder.

  In addition, the copyright management system 10 according to the present embodiment permits a content circulation application processing permission to determine whether or not to charge multiple times when the same content is used multiple times for generating secondary content. In accordance with the identifier, a charging process is executed when the same content is used a plurality of times for generating secondary content. Therefore, when the same content is used a plurality of times for generating the secondary content, the billing can be stopped as necessary.

  In addition, the copyright management system 10 according to the present embodiment determines whether or not to charge for the generation of secondary content when content that the copyright of the secondary content itself is used is used. In accordance with the content circulation elimination process identifier, a charging process is executed in the case where a content for which the creator of the secondary content is copyrighted is used to generate the secondary content. Therefore, it is possible to stop the charging when the content for which the creator of the secondary content itself has a copyright is used for generating the secondary content, if necessary.

FIG. 1 is a system configuration diagram of a copyright management system. FIG. 2 is a system configuration diagram of the client terminal. FIG. 3 is a system configuration diagram of the key management server. FIG. 4 is a configuration diagram of the license information database.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Copyright management system, 12 ... Client terminal, 14 ... Key management server, 20 ... Content input port, 22 ... Content storage module, 24 ... Resource ID reading module, 26 ... Encryption key request module, 28 ... User Interface: 30 ... License information input / output port, 32: Encryption key input / output port, 34 ... Content decryption module, 36 ... Content production module, 38 ... Content encryption module, 40 ... Content usage monitoring module, 42 ... License setting module, 50 ... license information input / output port, 52 ... license information search module, 54 ... license information database, 56 ... use execution availability determination module, 58 ... encryption key transmission module 58, 60 ... encryption key database, 62 ... use supervision Program sending module, 64 ... Encryption key input / output port, 66 ... Billing processing module, 68 ... Customer management database, 70 ... Billing information input / output port, 72 ... Rights inheritance logic operation module, 74 ... Content registration module, 76 ... License management module 78: Encryption key generation module.

Claims (3)

In a copyright management system comprising a client terminal and a key management server,
The client terminal is
Storage means for storing encrypted content received from the content server;
A request for transmitting a decryption key for decrypting the encrypted content stored in the storage means, including a use permission condition for using the content, is sent to the key management server. A decryption key requesting means to transmit;
Content that reads the encrypted content from the storage means, decrypts the read encrypted content using the decryption key transmitted from the key management server, and expands the decrypted content in a working memory Decryption means;
When the content decrypted by the content decrypting means is expanded in a working memory, the content is encrypted using a re-encryption key transmitted together with the decryption key from the key management server, and the encrypted content is Content encryption means for storing in the storage means;
Content generating means for generating secondary content using the content decrypted by the content decrypting means and expanded in the working memory;
A secondary content registration request including identification information of the content used for generating the secondary content generated by the content generation means and a right inheritance condition for using the secondary content input by a user Secondary content registration requesting means for transmitting to the key management server,
The key management server
A license information storage means for storing a use permission condition for using the content and a right inheritance condition for using the secondary content generated using the content;
Key storage means for storing a decryption key for decrypting content and a re-encryption key for re-encrypting content;
When the transmission request transmitted from the client terminal is received, the use permission condition of the content included in the transmission request is compared with the use permission condition of the content stored in the license information storage unit, Use permission determining means for determining whether or not the use permission condition of the content included in the transmission request satisfies the use permission condition of the content stored in the license information storage means;
When the use permission determination unit determines that the use permission condition of the content included in the transmission request satisfies the use permission condition of the content stored in the license information storage unit, the encrypted content is A decryption key transmitting means for reading a decryption key for decryption and a re-encryption key for re-encrypting the content decrypted by the decryption key from the key storage means, and transmitting it to the client terminal;
Charging processing means for executing charging processing when the decryption key and the re-encryption key are transmitted to the client terminal by the decryption key transmitting means;
When receiving the secondary content registration request transmitted from the client terminal, the secondary content included in the secondary content registration request using the identification information of the content included in the secondary content registration request as a key The content right inheritance condition is compared with the content right inheritance condition used for generating the secondary content stored in the license information storage means, and the secondary content included in the secondary content registration request is compared. Rights inheritance determination means for determining whether rights inheritance conditions satisfy the rights inheritance conditions of the content used for generating the secondary content stored in the license information storage means;
The right inheritance condition of the content used for generating the secondary content stored in the license information storage means by the right inheritance determining means, wherein the secondary content right inheritance condition included in the secondary content registration request is stored. A copyright management system comprising: content registration means for registering, in the license information storage means, a right inheritance condition for using the secondary content when it is determined that the secondary content is satisfied. The license information storage means includes first charging control information for determining whether or not to charge multiple times when the same content is used multiple times for generating secondary content,
The billing processing unit executes billing processing when the same content is used a plurality of times for generating secondary content based on the first billing control information. Copyright management system. In the license information storage means, a second charging control for determining whether or not to charge when the content of which the creator of the secondary content is copyrighted is used to generate the secondary content. Contains information,
The billing processing means executes billing processing in the case where content whose copyright is owned by the creator of the secondary content is used for generating the secondary content based on the second billing control information. The copyright management system according to claim 1.

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