WO2007074548A1

WO2007074548A1 - Copyright management system, key management server used therein, and client terminal

Info

Publication number: WO2007074548A1
Application number: PCT/JP2006/312651
Authority: WO
Inventors: Masao Hijikata; Yoshiaki Fukazawa; Wataru Kameyama; Akiko Seki; Yoshiki Ashida; Terumi Laskowsky
Original assignee: Waseda University
Priority date: 2005-12-26
Filing date: 2006-06-23
Publication date: 2007-07-05
Also published as: JP2009058983A

Abstract

A copyright management system (14) includes a key management server (14) and a client terminal (12). The key management server (14) has a right succession logic calculation module (72) which compares a right succession condition of a secondary content transmitted from the client terminal (12) to a right succession condition read from a license information database (54) by the license information search module (52) so as to judge whether the right succession condition of the secondary content contained in the secondary content registration request satisfies the right succession condition of the content used in generating the secondary content read from the license information database (54). If yes, the license ID of the secondary content and the like are registered in the license information database (54) and a third person can access the secondary content.

Description

Specification

Copyright management system and key management server and client used therefor

The present invention relates to a copyright management system, and a key management server and client terminal used therefor.

Background art

A copyright management system for managing the copyright of content distributed on a network is conventionally known. However, general copyright management systems that have been well known in the past often prohibit not only illegal use of content but also legitimate secondary use, resulting in content reuse. This has significantly hampered the distribution of reused content.

[0003] On the other hand, in Patent Document 1, the original author (material content) is paid a consideration for the copyright of the original work (material content) and the secondary usage fee, and the author of the secondary work (secondary content) Discloses a content management system that performs billing so that compensation for the copyright of the secondary 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. Patent Document 1: International Publication WO2003Z067486

Disclosure of the invention

Problems to be solved by the invention

[0004] However, in the content management system that works on the above-described conventional technology, the copyright holder of the material content (including secondary content that is used secondarily) is used by the secondary user ( (Including secondary users of secondary content) and secondary usage methods (including secondary usage methods of secondary content, etc.) for any reason, it cannot be limited. The problem was that secondary use of material content would be promoted indefinitely.

[0005] More specifically, a content management system empowered by the above-described conventional technology includes (1) material components. Even if the copyright holder of the contents does not permit modification of the material content, the secondary user will distribute the secondary content without permission to modify the material content. (2) Material Even if the copyright holder of the content sets the lower limit of the secondary content unit price, the secondary user sets the lower unit price without permission and distributes the secondary content. (3) Material content Despite the fact that the copyright holders of this site restrict distribution of secondary content to amateurs, secondary users may sell secondary content to professional editors without permission. Can not. As a result, the copyright holder of the material content may be given an unexpected disadvantage. In this way, when the copyright of the material content is inherited and the right to hope is not inherited by the secondary work, the phenomenon is called contradiction of rights inheritance.

[0006] Therefore, the present invention enables a copyright holder of material content to limit secondary users and secondary usage methods of the content, and as a result, eliminates the unexpected disadvantages of the copyright holder. However, it is an object of the present invention to provide a copyright management system capable of promoting secondary use of content, and a key management server and a client terminal used therefor.

Means for solving the problem

In order to solve the above problems, a copyright management system according to the present invention is a copyright management system including a client terminal and a key management server, and the client terminal uses material content. Register content generation means for generating secondary content, identification information of the material content used to generate the secondary content generated by the content generation means, and secondary content input by the user Secondary content registration request means for transmitting a secondary content registration request including a right inheritance condition to the key management server, the key management server for each material content as a material of the secondary content. A license information storage means for storing rights inheritance conditions for registering secondary contents; Rights inheritance conditions for secondary content included in the secondary content registration request sent from the client terminal and the material content rights that are stored in the license information storage means and used to generate the secondary content. Compared with conditions and included in the above secondary content registration request The right inheritance judgment that determines whether the right inheritance condition of the secondary content satisfies the right inheritance condition of the material content used for generating the secondary content stored in the license information storage means. And the right inheritance determining means store the secondary content right inheritance conditions included in the secondary content registration request in the license information storage means, and are used to generate the secondary content. Content registration means for registering the rights inheritance conditions for registering the secondary content in the license information storage means when it is determined that the rights inheritance conditions of the material content are satisfied. The

[0008] Also, the client terminal of the present invention is a client terminal used in a copyright management system including a client terminal and a key management server, and generates content that uses material content V and generates secondary content. Means, identification information of the material content used to generate the secondary content generated by the content generation means, and a right inheritance condition for registering the secondary content input by the user. And a secondary content registration requesting means for transmitting a secondary content registration request including the above to the key management server.

[0009] Also, the key management server of the present invention is a key management server used in a copyright management system including a client terminal and a key management server, and each of the material contents that are materials of secondary contents License information storage means for storing rights inheritance conditions for registering secondary content, and identification information of the material content that has been used by the client terminal to generate secondary content generated by the client terminal Receiving means for receiving a secondary content registration request including a right inheritance condition for registering the secondary content input by the user of the client terminal, and registering the secondary content received by the receiving means The secondary content right inheritance condition included in the request and the above license information storage means The secondary content right inheritance condition contained in the secondary content registration request is compared with the rights inheritance condition of the material content used for generating the secondary content. The right inheritance judging means for judging whether or not the rights inheritance conditions of the material content stored in the second content are used, and the right The right inheritance determination means stores the rights inheritance conditions for the secondary content included in the secondary content registration request in the license information storage means, and the material content used to generate the secondary content is stored in the license information storage means. It is characterized by comprising content registration means for registering the right inheritance condition for registering the secondary content in the license information storing means when it is determined that the right inheritance condition is satisfied.

[0010] When the right inheritance condition of the secondary content to be transmitted is stored in the license information storage means of the key management server and the right inheritance condition of the material content used to generate the secondary content is satisfied. If it is determined, the copyright owner of the material content can register the right inheritance condition for registering the secondary content in the license information storage means of the key management server and use it for others. It is possible to allow others to use the content while limiting secondary users and secondary usage methods.

In order to solve the above 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 receives an encryption received from the content server. A storage means for storing the encrypted content, and a decryption key transmission request for decrypting the encrypted content stored in the storage means, for using the content Decryption key requesting means for transmitting information including usage conditions to the key management server, and reading the encrypted content from the storage means, and reading the read encrypted content to the key management server. Content decrypting means for decrypting the decrypted content using the decryption key transmitted from the server and developing the decrypted content in a working memory; When the decrypted content is expanded in the working memory by re-encrypting the content using the re-encryption key transmitted from the key management server together with the decryption key, the re-encrypted content Content encryption means for storing the content in the storage means, content generation means for generating secondary content using the content decrypted by the content decryption means and developed in the working memory, and the content generation means Secondary content registration including identification information of the content used to generate the generated secondary content and a right inheritance condition for registering the secondary content input by the user Secondary content registration requesting means for transmitting a request to the key management server, wherein the key management server registers the use permission condition for using the content and the secondary content generated using the content. License information storage means for storing rights inheritance conditions for the contents, key storage means for storing a decryption key for decrypting the content and a re-encryption key for re-encrypting the content, and the client terminal card When the transmission request to be transmitted is received, the use 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, and the transmission request is Whether the usage conditions for the content included satisfy the usage license conditions for the content stored in the license information storage means The use permission determining means for determining whether or not the use condition of the content included in the transmission request satisfies the use permission condition of the content stored in the license information storing means. A decryption key for decrypting the encrypted content and a re-encryption key for re-encrypting the content decrypted with the decryption key; and The decryption key transmitting means for transmitting the decryption key and the re-encryption key generated by the encryption key generating means to the client terminal, and the decryption key and the re-encryption key by the decryption key transmitting means When transmitted to the client terminal, the billing processing means for executing the billing process and the secondary content registration transmitted from the client terminal When a request is received, the secondary content right inheritance condition and the license information stored in the secondary content registration request are stored using the identification information of the content included in the secondary content registration request as a key. The content inheritance condition of the secondary content included in the secondary content registration request is compared with the license information of the content that is stored in the means and used to generate the secondary content. The right inheritance judging means for judging whether or not the right inheritance condition of the content stored in the storage means and used for the generation of the secondary content is satisfied, and the secondary inheritance judging means The secondary content right inheritance condition included in the content registration request is stored in the license information storage means of the secondary content. If it is determined that satisfies the rights inherited condition of the content used for forming, the inherited rights conditions for utilizing the secondary content Content registration means for registering in the license information storage means is provided.

[0012] When it is determined that the usage condition of the content transmitted from the client terminal satisfies the usage license condition of the content stored in the license information storage unit of the key management server, the key management server sends the client terminal The decryption key is transmitted to the content to use the content, and the secondary content right inheritance condition transmitted by the client terminal is stored in the license information storage means of the key management server, and the secondary content is stored. When it is determined that the rights inheritance conditions of the content used to generate the content are satisfied, the rights inheritance conditions for registering the secondary content are registered in the license information storage means of the key management server for use by others. By providing this, the copyright holder of the material content can restrict the secondary users and secondary usage methods of the content to others. Nten' it is possible to use the.

[0013] Further, in the copyright management system of the present invention, the license information storage means is charged a plurality of times when the same content is used a plurality of times for generating secondary content. First billing control information for determining whether or not it is a failure is included, and the billing processing means uses the same content a plurality of times for generating secondary content based on the first billing control information. It is preferable that the billing process is executed when the payment is made.

[0014] For example, if a certain creator tries to use a plurality of contents in combination, the same material may be included in the plurality of contents. In such a case, the creator has the disadvantage of falling into a breach of having to pay the copyright for the same material more than once. This phenomenon is called contention contradiction.

[0015] Same as secondary content generation based on 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 This inconvenience can be solved by executing the billing process when the content is used multiple times.

In the copyright management system of the present invention, the license information storage means includes Includes secondary charging control information for determining whether or not to charge if the content of which the secondary content creator itself is copyrighted is used to generate secondary content. The billing processing means charges based on the second billing control information when a content that is copyrighted by the creator of the secondary content is used to generate the secondary content. It is preferable that the process is executed

[0017] For example, if there is a creator who wants to use content as a material for secondary use, there may be a case where content that he owns copyright (for example, content that he created before) is included as material. . In such a case, the creator has the disadvantage of falling into a breach where he must pay the copyright for himself. Such a phenomenon is also called content circulation contradiction.

[0018] In the second charging control information for determining whether or not to charge if the content of which the secondary content creator itself is copyrighted is used to generate the secondary content. On the basis of this, it is possible to eliminate such inconvenience by executing a billing process in the case where a content whose copyright is owned by the creator of the secondary content is used to generate the secondary content.

The invention's effect

[0019] Since the copyright management system of the present invention has the features as described above, the copyright holder of the material content gives the secondary user, secondary usage method, usage fee, etc. of the material content. It is possible to allow others to use the content while limiting. As a result, it is possible to promote secondary use of content while eliminating the unexpected disadvantages of copyright holders.

Brief Description of Drawings

FIG. 1 is a system configuration diagram of a copyright management system.

FIG. 2 is a system configuration diagram of a client terminal.

FIG. 3 is a system configuration diagram of a key management server.

FIG. 4 is a configuration diagram of a license information database.

FIG. 5 is a flowchart showing the operation of the copyright management system. FIG. 6 is a flowchart showing the operation of the copyright management system.

FIG. 7 is a flowchart showing the operation of the copyright management system.

Explanation of symbols

[0021] 10 ··· Rights management system, 12 ··· Client terminal, 14 ··· Key management sano, 20 ··· Content input port, 22 ··· Content 'storage' module, 24 ··· License ID reading mode , 26 ... Content usage request module, 28 ... User's interface, 30 ... License information input / output port, 32 ... Encryption key input / output port, 34 ... Content decryption module, 36 ... Content generation module, 38 ... Content encryption module, 40 ... Content usage control module, 42 ... License setting module, 50 ... License information I / O port, 52 ... License information search module, 54 ... License information database 56 ... Use execution determination module, 58 ... Encryption key sending module 58, 60 ... Encryption key database, 64 ... Enter encryption key Output port, 66 ... Billing processing module, 68 ... Customer management database, 70 ... Billing information input / output port, 72 ... Rights inheritance logic module, 74 ... Content registration module, 76 ... License management Module, 78 ··· 喑 key generation module

BEST MODE FOR CARRYING OUT THE INVENTION

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

[0023] First, the configuration of a copyright management system that is useful in the present embodiment will be described.

[0024] FIG. 1 is a configuration diagram of a copyright management system that works on the present embodiment. As shown in FIG. 1, a copyright management system 10 according to the present embodiment includes a client terminal 12 and a key management server 14. Each of the client terminal 12 and the key management server 14 is connected to the Internet 16 and can send and receive data to and from each other via the Internet 16. The client terminal 12 can download encrypted content from the content server 18 connected to the Internet 16. This content includes all kinds of content such as still image data, moving image data, music data, text data, source code (including source code of open source software), and secondary content created using these data as materials. Format Data.

FIG. 2 is a system configuration diagram of the client terminal 12. As shown in FIG. 2, the client terminal 12 functionally includes a content input / output port 20, a content 'storage' module 22 (storage means), a license ID reading module 24, and a content use request module 26. (Decryption key request means), user 'interface 28, license information input / output port 30, encryption key input / output port 32, content decryption module 34 (content decryption means), and content generation module 36 (content generation means) The content encryption module 38 (content encryption means), the content usage control module 40, and the license setting module 42 (secondary content registration request means) are configured.

[0026] The client terminal 12 is physically a computer system including an input device such as a CPU, a hard disk, a memory, 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 each functional element 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 includes a license information input / output port 50 (reception means), a license information search module 52, a license information database 54 (license information storage means), and a use executability determination module 56 (use Enable / disable judging means), encryption key sending module 58 (decryption key sending means), encryption key database 60 (key storage means), encryption key input / output port 64, billing processing module 66 (billing processing means), and customer management Database 68, accounting information input / output port 70, right inheritance logic operation module 72 (right inheritance judgment means), content registration module 74 (content registration means), license management module 76, and encryption key generation module 78 And is configured.

[0028] The key management server 14 is physically 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 each functional element shown in Fig. 3 are realized by installing predetermined computer software. [0029] Hereinafter, the constituent elements of the client terminal 12 and the key management server 14 will be described in detail with reference to FIG. 2, FIG. 3, and FIGS.

The content generation module 36 of the client terminal 12 generates material content based on an instruction input via the user interface 28 by the original author who is the user of the client terminal 12.

[0031] The license setting module 42 accepts the input of the use permission condition and the right inheritance condition desired by the original author for the material content via the user's interface 28 (according to the use permission condition and the right inheritance condition). Will be described later). The license setting module 42 also transmits a registration request including the received use permission condition and right inheritance condition to the key management server 14 via the license information input / output port 30.

[0032] Upon receiving the registration request via the license information input / output port 50, the content registration module 74 automatically generates (license ID) as identification information of the content, The generated license ID is associated with the above-mentioned use permission condition and right inheritance condition, and is written in the license information database 54.

[0033] When a license ID is given to the material content by the content registration module 74, the encryption key generation module 78 generates an encryption key for encrypting the material content. When the encryption key for the material content is generated by the encryption key generation module 78, the encryption key transmission module 58 transmits the encryption key with the license ID to the client terminal 12 via the encryption key input / output port 64. To do. The encryption key generation module 78 also generates the encryption key transmitted by the encryption key transmission module 58 and stores it in the encryption key database 60 together with the transmission history and the license ID.

[0034] When the client terminal 12 receives the encryption key via the encryption key input / output port 32, the content encryption module 38 encrypts the material content using the encryption key. The content encryption module 38 also stores the encrypted material content in the content 'storage' module 22 with a license ID attached to its header. The content encryption module 38 discards (deletes) the encryption key when the encrypted material content is stored in the content 'storage' module 22. The encrypted material content is uploaded to the content server 18 shown in FIG. 1 via the content input / output port 20 based on the execution command input via the user interface 28.

[0036] A person who wants to use the content uploaded to the content server 18 When a content download request is sent from the client terminal 12 to the content server 18 (S01), the content download request is accepted. The encrypted content is read out (S02), and the encrypted content is transmitted from the content server 18 to the client terminal 12 (S03). The client terminal 12 receives the encrypted content transmitted from the content server 18 via the content input / output port 20 (S04). Here, the encrypted content header transmitted from the content server 18 includes a license ID which is identification information for identifying the content.

[0037] The encrypted content received from the content server 18 is stored in the content storage module 22 (S05).

The content use request module 26 transmits a decryption key transmission request for decrypting the encrypted material content stored in the content “storage” module 22 to the key management server 14. More specifically, the content use request module 26 first receives an input of a content use execution command from a secondary user of the content via the user 'interface 28. Here, the input of the content use execution command includes a specification that secondary use of the specific content (for example, specification by a thumbnail) is included. Upon receipt of the input of the use execution command, the encryption key transmission module 26 transmits to the license ID reading module 24 a request for reading the license ID of the content specified by the use execution command.

[0039] Based on the license ID read request sent from the content use request module 26, the license ID read module 24 searches for and uses the encrypted content stored in the content 'storage' module 22. The license ID is read from the header header of the content specified by the execution instruction, and the read license ID is sent to the content use request module 26.

[0040] The content use request module 26 is transmitted from the license ID reading module 24. A decryption key transmission request including the received license ID is transmitted 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 key management server 14 receives the decryption key transmission request transmitted from the client terminal 12, the license information search module 52 uses the license ID of the content included in the decryption key transmission request as a key to the license information database 54. Is read out, and the license agreement is sent to the client terminal 12 via the license information input / output port 50.

FIG. 4 is a configuration diagram of the license information database 54. In the license information database 54, as shown in FIG. 4, for each content, the license ID, the copyright holder information, the content circular revocation processing permission controller, the license conditions (license conditions, rights inheritance conditions) (Required condition, selection condition)). The serial number shown in FIG. 4 is merely a temporary number and is not a component of the license information database 54. Here, the license ID is an ID for specifying a license condition including a licensed content, its use permission condition and a right inheritance condition.

[0044] Further, the content circulation cancellation process permission controller is a controller for determining whether or not to charge multiple times when the same content is used multiple times for generating secondary content. (1st billing control information) and whether or not the content that the copyright of the secondary content creator itself uses is used to generate secondary content! Is a controller (second charging control information) for determining In addition, two types of content circulation cancellation processing permission controllers are provided, and whether or not to charge multiple times if the same content is used multiple times for generating secondary content, and generating secondary content. It is also possible to control independently whether the secondary user himself / herself uses copyrighted content or not.

[0045] The use permission condition is a condition for using the content, and is expressed by a type of "right" to be used and a "restriction condition" regarding the use permission. Here, “right” means a right according to the use form such as “viewing”, “modification”, “distribution”, etc. If there is no description, it means that there is no “right” that is subject to use permission. On the other hand, “restriction conditions” are conditions that limit users, such as “Anyone”, “Distributors”, and conditions that limit “Consideration”, “Use period”, “Number of uses”, etc. If there is no description here, it means that there are no special restrictions.

[0046] Further, the right inheritance condition is a condition for allowing the secondary user to register the secondary content generated using the content, and the type of right permitted to be registered as a license for the secondary content. It is expressed by the constraint condition regarding the permission of its use. In particular, the essential conditions are conditions that must be observed by the secondary user when registering secondary content generated using the content. The selection condition is a condition that can be arbitrarily selected when the secondary user registers the secondary content generated using the content.

[0047] For example, referring to FIG. 4, when registering the secondary content generated by using the content with the serial number “0002”, the copyright holder of the secondary content is always However, it must be registered under the condition that the secondary content is viewed at 500 yen or more. In addition, when registering secondary content generated using the content with serial number “0003”, the copyright holder of the secondary content must distribute the secondary content to the “distributor” for 50000 yen. Can be set arbitrarily. If the required content of the serial number “0004” is blank, it means that the copyright holder of the secondary content has no obligation to protect. If only the “Compensation” column is blank, This means that there is no obligation to observe the “consideration” setting, that is, no matter how much “consideration” can be set. If the selection condition for the content with the serial number “0002” is blank, it means that the copyright holder of the secondary content may set it, and there is no “right”.

[0048] It should be noted that a control element indicating "prohibition" or "permission" of change is added to the constraint condition in the right inheritance condition, and when "prohibition" is defined ("prohibition control element" in FIG. 4). (When a check mark is added to the column), it means that when registering a license for secondary content, it is prohibited to change the constraint on the applicable rights. On the other hand, in the case of “permitted” (when a check mark is added to the “permission control” column in FIG. 4), the restriction It means that changes within the conditions are allowed.

Returning to FIG. 3, when the key management server 14 receives a decryption key transmission request transmitted from the client terminal 12, the license information search module 52 uses the license ID of the content included in the decryption key transmission request as a key. In addition, the license terms and conditions of the contents stored in the license / blueprint database 54 are read out and transmitted to the client terminal 12 via the license information input / output port 50.

[0050] The user of the client terminal 12 refers to the license agreement of the content to which the key management server 14 has also transmitted, and uses a user execution interface (usage rule) within the scope of the license agreement. (S11). The content usage request module 26 transmits the usage conditions input (or selected) by the user to the key management server 14 (S12). Here, the usage conditions are transmitted from the client terminal 12 to the key management server 14, but the transmission of the usage conditions is a part of a transmission process of a series of decryption key transmission requests.

[0051] When the use execution permission determination module 56 of the key management server 14 receives the above-mentioned content use condition from the client terminal 12 (S13), the use condition and license information database 54 stores the content use condition. (S14) and the usage conditions of the content transmitted from the client terminal 12 are the license information database. It is determined whether or not the conditions satisfying the license agreement for the content stored in the table are satisfied. When it is determined that the usage conditions for the content transmitted from the client terminal 12 do not satisfy the usage permission conditions for the content stored in the license information database 54, the usage execution determination module 56 The license terms of use 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 judgment result and the license information database 54 license terms of the stored content, inputs new usage conditions, and again from the client terminal 12. The key management server 14 can send new usage conditions. [0052] It should be noted that the process of repetitively correcting in this way can also be designed to be processed locally at the client terminal 12 (that is, the client terminal 12 can use the license agreement transmitted from the key management server 14). In this case, the key management server 14 must be designed to make the final decision. This is to eliminate the risk of unauthorized processing being performed at the client terminal 12. When it is determined that the use condition of the content transmitted from the client terminal 12 satisfies the use permission condition of the content stored in the license information database 54, the use execution determination module 56 determines the determination result as an encryption key. Sent to sending module 58.

The encryption key transmission module 58 uses the determination result that the use condition of the content transmitted from the client terminal 12 satisfies the use permission condition of the content stored in the license information database 54. 56, 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. Then, the data is transmitted to the client terminal 12 (S15). (The encryption key is transmitted in a form protected by SSL or the like.) Also, the encryption key sending module 58 transmits the decryption key and the re-encryption key to the client terminal 12 and simultaneously the decryption key and the re-encryption. Record the key in the encryption key database 60. Here, in the encryption key database 60, a decryption key for decrypting the content and a re-encryption key for re-encrypting the content decrypted by the decryption key are stored in time series for each content and for each user. Is done.

The accounting processing module 66 transmits the decryption key and the re-encryption key to the client terminal 12 by the encryption key transmission module 58, and obtains reception confirmation of the decryption key and the re-encryption key from the client terminal 12. If so, the accounting process is executed (S16). More specifically, when the above-mentioned receipt confirmation is obtained, the billing processing module 66 refers to the license information database 54, and displays the billing amount described in the license information database 54 in the license information database column. It is added to the charge amount information of the recipient of the decryption key, and 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 revenue amount is stored in the customer management database 68. In addition, the above billing amount, revenue Information such as the deposit amount is transmitted to an external settlement server (not shown) via the accounting information input / output port 70 at the time of renewal or at regular intervals. Here, the update of the billing amount information does not necessarily correspond to the actual amount. For example, a point system may be used in which profits are distributed from a certain source according to the percentage of points accumulated. Such a method is suitable when the source of revenue depends on advertising revenue.

[0055] Here, when a plurality of content decryption keys are requested at once, the charging processing module 66 refers to the content circulation cancellation processing permission controller in the license information database 54 and performs the following charging processing. Execute. In other words, when the content circulation cancellation process permission control element is Yes (when a check mark is added to the “content circulation cancellation process permission control element” column in FIG. 4), secondary content generation is not performed. Duplicate billing is stopped when the same content is used multiple times, or when content that is copyrighted by the secondary user is used to generate secondary content. Whether the same content is used more than once for generating secondary content, and whether the content that the secondary content creator itself owns is used for generating secondary content. To determine whether or not, refer to the license ID in the license information database 54, whether a decryption key for content having the same license ID is requested more than once, or a license for which the secondary user himself has copyright. This is done depending on whether a decryption key for content with ID is required!

Returning to FIG. 2, when the decryption key and the re-encryption key are 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 (S17), and the read encrypted content is decrypted using the decryption key transmitted from the key management server 14 (S18), and the decrypted content is stored in the working memory. Expand (S19). After decrypting the content, the decryption key used for decryption is discarded.

[0057] When the content decrypted by the content decryption module 34 is expanded in the working memory and used for a certain purpose such as viewing or modification, the content encryption module 38 immediately starts from the key management server 14. Use the re-encryption key sent with the decryption key The content is re-encrypted (S20), and the re-encrypted content is stored in the content 'storage' module 22 (S21).

[0058] The content generation module 36 generates secondary content using the content decrypted by the content decryption module 34 and expanded in the working memory (S22). More specifically, the content generation module 36 performs processing of material content, composition processing of a plurality of material contents, etc. based on an instruction input from the user (secondary user) via the user's interface 28. To generate secondary content. The secondary content is configured as a package of the material content used and the scenario (including the usage history of the material content) describing the hierarchical structure of the secondary content.

[0059] When the secondary content is generated by the content generation module 36, the content usage control module 40 does not use content that is used for generating secondary content that violates the above-mentioned usage permission conditions. To control. For example, if editing is permitted, the “Edit” button should not be displayed, and control is performed so that the command will not be executed even if the command is entered in the script.

[0060] The license setting module 42 includes the license ID (identification information) of the material content used for generating the secondary content generated by the content generation module 36, and the material content created by the secondary user himself. Then, a secondary content registration request including the desired use permission condition and right inheritance condition is transmitted to the key management server 14 (S23). The use permission condition and the right inheritance condition are input via the user 'interface 28 when the secondary user wants to register 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 (S 24), the content registration module 74 starts with the secondary user himself / herself. The material contents created by J are registered in the license † blueprint database 5 4. Subsequently, the license information search module 52 searches the license information database 54 using the license ID of the material content included in the secondary content registration request as a key, and all the materials specified by the license ID. The content right inheritance condition is read (S25).

[0062] Further, the right inheritance logical operation module 72 carries out the right inheritance of all the material contents. The logical operation of the condition and the rights inheritance condition of the material content newly created by the secondary user is performed, and the calculation result is transmitted to the client terminal 12 through the license information input / output port 50.

The procedure of the logical operation is as follows. For example, we define p (M) as the set of rights included in the essential conditions of material content M and c (M) as the set of rights included in the selection conditions. When generating the following content:

<Tegagawa's page for required conditions for secondary content>

1. For material content A, find the logical sum u (A) of the required condition and the selection condition: u (A) = p (A) U p (B)

2. Find the logical sum u (B) of the essential and selection conditions for material content B: u (B) = p (B) U c (B)

3. For material content C, obtain the logical sum u (C) of the required condition and the selection condition: u (C) = p (C) U c (C)

4. Find the logical product i of the above logical sums:

i = u (A) ΓΊ u (B) ΓΊ u (C)

5. If [p (A) c i] Λ [p (B) c i] Λ [p (C) c i] = F (false),

The system stops processing.

6. If [p (A) c i] Λ [p (B) c i] Λ [p (C) c i] = T (true),

Find the following logical sum σ:

σ = p (A) U p (B) U p (C)

7. Inherits all the rights contained in σ and sets it as secondary content.

8. If the above inheritance is rejected, the system stops processing.

1. Find the following logical product δ

2. If δ = φ (empty set), the selection condition cannot be set. 3. If δ ≠ φ, select an arbitrary right included in δ and set it as secondary content.

The right inheritance logical operation module 72 exchanges information with the license setting module 42 of the client terminal 12 via the license information input / output port 50 according to the above procedure. Here, the secondary user refers to the logical operation result displayed on the display of the client terminal 12 and inputs the desired use permission condition and right inheritance condition for the secondary content generated by the secondary user. .

For example, in FIG. 4, the content with the serial number “0002” has the essential condition of the right inheritance condition “viewing [everyone ≥ ¥ 500]”. In this case, the secondary content creator cannot register the secondary content unless the license is set so that anyone can view the content for 500 yen or more. Also, when generating secondary content from content with serial number “0003” and serial number “0004”, the license settings as shown in the rights inheritance conditions of serial number “0005” can be established without contradiction. Is possible. This is because “viewing”, which is a license condition for the license “Χ0001”, is specified as an indispensable condition in the license “Α0001” and as a selection condition in the license “C0001”. This is because the license “A0001” has no constraint condition, and the license “C0001” has a constraint condition of 300 yen and is prohibited from being changed. On the other hand, “Modification” 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 “A0 001”. Not. For “Distribution”, both license “A0001” and license “C0001” are specified as selection conditions, and “Distributor” specified as the distribution target in license “A0001” is specified by license “C0001”. It is included in the category of “Everyone”, and the contents of the license are both “Billing”. The license “A0001” should be sold more than 50000 yen, and the license “C0001” should be sold more than 1000 yen. Should be. Nevertheless, there is no designation in the license agreement for the license “X0001” because the copyright owner YA has not selected the right. Here, the secondary user of the material content can repeatedly correct the input of the use permission condition and the right inheritance condition until a satisfactory result is obtained. That is, when registration of the secondary content is rejected, the right inheritance logic operation module 72 sends the judgment result and the material content right inheritance condition stored in the license information database 54 via the license information input / output port 50. To the client terminal 12. The user of the client terminal 12 refers to the material content right inheritance condition stored in the transmitted determination result and license information database 54, inputs a new right inheritance condition, and again from the client terminal 12 It is possible to cause the key management server 14 to send a secondary content registration request. In addition, it is possible to design a mechanism in which the process of correcting iteratively in this way is processed locally at the client terminal 12, but even in that case, the final decision must be made at the key management server 14. Do not become. That is, finally, the right inheritance logical operation module 72 of the key management server 14 determines whether the content inheritance condition of the secondary content included in the secondary content registration request is stored in the license information database 54. It is determined whether the right inheritance condition is satisfied (S26). This is to eliminate the risk of unauthorized processing being performed at the client terminal 12. When the rights inheritance condition for the secondary content is established, the rights inheritance logic module 72 permits the registration of the secondary content. When the secondary content registration is permitted, the right inheritance logical operation module 72 transmits the determination result to the content registration module 74.

[0067] The content registration module 74 uses the rights inheritance logic operation module 72 to generate the secondary content in which the rights inheritance conditions for the secondary content included in the secondary content registration request are stored in the license information database 54. If it is determined that the rights inheritance condition of the material content used for the content is satisfied, a license ID of the secondary content is generated, and the license ID of the secondary content, the copyright holder † blueprint, and the content circulation are generated. The revocation processing permission controller and license conditions (use permission conditions, right inheritance conditions (required conditions, selection conditions)) are registered in the license information database 54 (S27), and third party access is also possible.

[0068] The encryption key generation module 78 includes the license ID and copyright holder information of the secondary content. When the content circulation revocation processing permission controller, license ID, license agreement, and rights transfer conditions are registered in the license information database 54, an encryption key for encrypting the secondary content is generated, and the generated encryption The key is stored in the encryption key database 60, and the encryption key and the license ID of the secondary content are transmitted to the client terminal 12 via the encryption key input / output port 64 (S28).

Here, the license management module 76 performs update management of the license information database 54.

[0070] Returning to Fig. 2, when the license ID of the secondary content and the encryption key of the secondary content are received from the key management Sano 14 (S29), the content encryption module 38 of the client terminal 12 Then, the secondary content is encrypted using the encryption key (S30), and the encrypted secondary content is registered in the content 'storage' module 22 with the license ID attached to the header. The encrypted secondary content is uploaded from the client terminal 12 to the content server 18 with the license ID attached to the header (S31), stored in the content server 18 (S32), and the third content. It is offered to the use of the person.

[0071] It should be noted that by installing the encryption key generation module also in the client terminal 12, the encryption key generated by the client terminal 12 is used to encrypt the secondary content, and then the encryption key is transferred to the client terminal 12. A method may also be considered in which the key management server 14 transmits the received encryption key from 12 to the key management server 14 and stores the received encryption key in the encryption key database 60 for management. In this case, the client terminal first receives only the license ID from the key management server 14 and encrypts the secondary content with the encryption key generated by itself.

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 in accordance with an instruction from a person who performs tertiary use (tertiary user). The downloaded secondary content is stored in the content storage module ₂₂ of the client terminal 12. Here, the license ID is attached to the header of the secondary content stored in the content storage module 22.

[0073] Subsequently, a transmission request for a decryption key including a secondary content use execution command input by a tertiary user of the secondary content and a license ID of the secondary content is received. Sent to the physical server 14.

[0074] When the key management server 14 receives the decryption key transmission request transmitted from the client terminal 12, the license information search module 52 uses the license ID of the content included in the decryption key transmission request as a key to the license information database 54 Is read out and transmitted to the client terminal 12 via the license information input / output port 50. The tertiary user determines whether or not the content can be used with reference to the use permission condition, and if yes, inputs a use execution command via the user's interface 28, and if not, inputs a use stop command. To do. In the latter case, the system immediately ends processing.

[0075] When there are a plurality of options or a quantitative condition with a certain range in the use permission condition, the tertiary user can use the user's interface to execute a use execution command within the range. Enter through 28. (The system only accepts input within that range.)

[0076] If the user of the client terminal 12 is within the above range, the user terminal 12 can input a new use permission condition and send the decryption key transmission request from the client terminal 12 to the key management server 14 again. it can. Although it is possible to design a mechanism in which the process of repetitive correction in this way is processed in a simple manner at the client terminal 12, even in that case, the final decision must be designed to be 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 license agreement for the content included in the decryption key transmission request satisfies the license agreement for the content stored in the license information database 54, the use execution determination module 56 Is transmitted to the encryption key transmission module 58.

[0077] When it is determined that the license agreement for the content included in the decryption key transmission request satisfies the license agreement for the content stored in the license information database 54, the encryption key transmission module 58 A decryption key and a re-encryption key corresponding to the ID are transmitted to the client terminal 12. At the same time (more precisely, when the receipt confirmation of the decryption key and the re-encryption key is obtained from the client terminal 12), the accounting processing for the secondary content is executed by the accounting processing module 66.

[0078] At the client terminal 12, the content decryption module 34 causes the received decryption key Is used to decrypt the secondary content. The decrypted secondary content is expanded in the working memory.

[0079] When the secondary content is decrypted and expanded in the working memory, the content use request module 26 assigns the license ID of the material content recorded in the secondary content and the creation content of the secondary user. A request to send the decryption key for the content is sent to the key management server 14.

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

[0081] Note that here, decryption and re-encryption are repeated for all material contents, but the process of transmitting the next decryption key and re-encryption key from the key management server 14 is omitted to save the amount of information processing. It is also possible to do. In other words, the decryption key and re-encryption key are generated and sent only to the secondary content package described above, and each material content is generated and sent to the client terminal 12 first. It can be used repeatedly. Even in this case, the cryptographic strength of the material content can be maintained by applying the cryptographic strength S to each material content by the encryption that works on the entire knock. Even in such a method, the usage history of the material content is maintained as a hierarchical structure description in the processing scenario, so that charges for the use of each material content are accurately executed, and each original author is There is no problem in paying the secondary usage fee.

In the key management server 14, the billing processing module 66 executes billing processing related to the creative content of the secondary content by the billing processing module 66 based on the transmission of the decryption key. However, if the original author of the material content specifically wishes, the following exemption processing can be selected.

[0083] (1) If the content created by the tertiary user is included as material in the material content, billing is stopped. For example, in Figure 4, when the copyright holder MH tries to use the content with serial number “0005” for the third time, the content with serial number “0003” that he created is included as material content! In that case, you can avoid the charge for that amount. However, as shown in the serial number “0006” , Copyright holder Y. Α. Power S Content circulation revocation processing permission controller is set to “No” (in the case of “Content repetitive revocation processing permission control” in FIG. 4) ), The charge exemption processing for the content of license “X0001” is not executed.

[0084] (2) When multiple contents with the same license ID are included as material in the material content, the charging process is executed only for the first content, and the charging process is performed for the other contents. Stop. For example, in Fig. 4, when the copyright owner YF tried to generate the tertiary content by combining and processing the secondary content with the serial number "0005" and the content with the serial number "0001", the serial number "0005" In the secondary content, content with serial number “0003” was included as material content. Here, both the content of the serial number “0001” and the content of the serial number “00 03” have the license ID “A0001”. In this case, the charging process is executed only for the content with the serial number “0001”, and the charging process is stopped for the content with the serial number “0003”. This process allows copyright holder Y. F. to avoid double charges for the same content. However, as shown in the serial number “0006”, if YA has set the content circulation revocation processing permission control to “No”, the charge exemption processing for the content of the license “X0001” is executed. Nao.

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, it is re-encoded and stored in the content “storage” module 22. The content content and the secondary user's creative content that has been encrypted and stored are decrypted by the content decryption module 34 and expanded in the working memory, and the material content is used by the secondary user's creative content V The secondary content is restored. When the material content or the secondary user's creative content is decrypted and expanded in the working memory, the encryption key used for decryption is discarded, and the material content or the secondary user's creative content is Re-encrypted with the re-encryption key and stored in content storage module 22

[0086] The restored secondary content is processed and corrected by the content generation module 36. Or synthesized with content created by tertiary users.

[0087] Next, the operation and effect of the copyright management system that works on this embodiment will be described. The copyright management system 10 according to the present embodiment satisfies the use permission condition of the content stored in the license information storage database 54 of the key management server 14 when the use condition of the content transmitted from the client terminal 12 is stored. If it is determined, the key management server 14 sends the decryption key to the client terminal 12 to use the content. In addition, if 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 rights inheritance conditions for using the secondary contents are 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 disadvantages of copyright holders.

[0088] Further, the copyright management system 10 according to the present embodiment determines whether or not it is possible to charge multiple times when the same content is used multiple times for generating secondary content. In accordance with the content circulation cancellation process permission controller, the charging process is executed when the same content is used multiple times to generate the secondary content. Therefore, when the same content is used a plurality of times for generating the secondary content, the billing can be stopped a plurality of times as necessary.

In addition, the copyright management system 10 according to the present embodiment has a power to charge when the secondary content creator uses the copyrighted content for generating the secondary content. In accordance with the content circulation cancellation processing controller for determining whether or not the content that has the copyright of the secondary content creator itself is used to generate the secondary content, the charging process is executed. Therefore, billing can be stopped if necessary when content for which the creator of the secondary content is copyrighted is used to generate the secondary content.

Claims

The scope of the claims

[1] In a copyright management system equipped with a client terminal and a key management server,

The client terminal is

Content generating means for generating secondary content using material content, identification information of the material content used for generating the secondary content generated by the content generating means, and the secondary input by a user Secondary content registration request means for transmitting a secondary content registration request including a right inheritance condition for registering content to the key management server;

With

The key management server

A license information storage means for storing a right inheritance condition for registering the secondary content for each of the material content as the material of the secondary content;

Rights inheritance condition of secondary content included in the secondary content registration request to be transmitted and the content content right inheritance stored in the license information storage means and used to generate the secondary content The content inheritance condition of the secondary content included in the secondary content registration request is stored in the license information storage means, and the right of the material content used to generate the secondary content is stored. Rights inheritance determining means for determining whether or not the inheritance conditions are satisfied, and the rights inheritance determining means stores the rights inheritance conditions for the secondary content included in the secondary content registration request in the license information storage means. It is determined that the material content used for generating the secondary content satisfies the right inheritance condition. Content registration means for registering rights inheritance conditions for registering the secondary content in the license information storage means.

A copyright management system characterized by comprising:

[2] In a client terminal used in a copyright management system having a client terminal and a key management server,

Content generating means for generating secondary content using material content, and used for generating the secondary content generated by the content generating means Secondary content registration request means for transmitting a secondary content registration request including identification information of the material content and a right inheritance condition for registering the secondary content input by a user to the key management server. When

A client terminal comprising:

[3] In a key management server used in a copyright management system having a client terminal and a key management server,

Rights inheritance conditions for causing the client terminal to register the identification information of the material content used to generate the secondary content generated by the client terminal and the secondary content input by the user of the client terminal Receiving means for receiving a secondary content registration request including:

Rights inheritance conditions for secondary content included in the secondary content registration request received by the receiving means, and rights inheritance of the material content used to generate the secondary content 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, and is used to generate the secondary content. Right inheritance determination means for determining whether or not the right inheritance condition is satisfied, and the right inheritance determination means determines whether the secondary content right inheritance condition included in the secondary content registration request is stored in the license information storage means. It is determined that the rights inheritance condition of the material content used to generate the stored secondary content is satisfied. If the content registering means for registering the rights inherited condition for registering the secondary content to the license information storing means

A key management server comprising:

[4] In a copyright management system equipped with a client terminal and a key management server,

The client terminal is

Storage means for storing encrypted content received from the content sano, and decryption for decrypting the encrypted content stored in the storage means A decryption key requesting means for transmitting to the key management server a request for transmitting a key, which includes a use condition for using the content;

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 develops the decrypted content in a working memory Decryption means;

When the content decrypted by the content decrypting means is expanded in the working memory, the content is re-encrypted using the re-encryption key transmitted from the key management server together with the decryption key, and the re-encrypted content is stored. 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 developed in the working memory;

Secondary content registration including identification information of the content used for generating the secondary content generated by the content generation means and a right inheritance condition for registering the secondary content input by a user Secondary content registration request means for transmitting a request to the key management server;

With

The key management server

A license information storage means for storing a license condition for using the content and a right inheritance condition for registering 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 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 a use condition of the content included in the transmission request satisfies a use permission condition of the content stored in the license information storage means;

Terms of use of the content included in the transmission request by the availability determination unit When it is determined that the content satisfies the use permission condition of the content stored in the license information storage unit, a decryption key for decrypting the encrypted content, and a content decrypted by the decryption key Encryption key generation means for generating a re-encryption key for re-encryption; and

Decryption key transmission means for transmitting the decryption key and the re-encryption key generated by the encryption key generation means 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 the secondary content registration request transmitted from the client terminal is received, the secondary content registration request included in the secondary content registration request is used by using the content identification information included in the secondary content registration request as a key. Next content right inheritance conditions are compared with the content right inheritance conditions stored in the license information storage means and used to generate the secondary content, and the secondary content registration request includes the secondary content registration request. Right inheritance judging means for judging whether the right inheritance condition of the next content satisfies the right inheritance condition of the content used for generating the secondary content stored in the license information storing means;

Rights inheritance of the content used by the right inheritance determination unit used for generating the secondary content in which the secondary content right inheritance condition included in the secondary content registration request is stored in the license information storage unit Content registration means for registering rights inheritance conditions for registering the secondary content in the license information storage means when it is determined that the condition is satisfied;

A copyright management system characterized by comprising:

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. And

5. 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 described in. In the license information storage means, a second content for determining whether or not to charge when a content that is copyrighted by the creator of the secondary content is used to generate the secondary content. Billing control information is included,

The billing processing means executes billing processing when content whose copyright is owned by the creator of the secondary content is used to generate secondary content based on the second billing control information.

The copyright management system according to claim 4, wherein: