JP2005258927A - Dynamic value control drm system, license issuing server, content reproduction device, cooperation method of dynamic value control and drm, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic value control DRM system capable of performing cooperation without impairing versatility of a DRM while making use of an advantage of a dynamic value control system and an advantage of the DRM. <P>SOLUTION: This dynamic value control DRM system is provided with a license issuing server 20 that is a common interface between a DRM license issuing server 22 and a control information issuing server 21. Identification information (URL information or the like) about the license issuing server 20 is written into a DRM content file 13 generated by a DRM content distribution server 10. A dynamic value control DRM player 30 receiving the DRM content file 13 acquires control information and a DRM license on the basis of the identification information about the license issuing server 20 included in a DRM content, and reproduces the DRM content file 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dynamic value control DRM system in which a dynamic value control system that dynamically fixes the value of digital content at the time of use, and DRM (Digital Rights Management) that is a copyright protection technology, and a license issuance The present invention relates to a server, a content reproduction apparatus, a dynamic value control and DRM linkage method, and a program.

  In recent years, with the spread of broadband and the like, a wide variety of digital contents have been provided. In full-scale distribution of digital content, prevention of copyright infringement due to illegal copying of digital content is a major issue.

  On the other hand, when providing digital content to a user, a dynamic value system that can dynamically fix the value of the digital content in accordance with the purpose of use of the user has been proposed.

  As described above, as an example in which a user dynamically selects the value of digital content, a method of providing sample content and product content as one distribution content has been proposed. In this example, content of two qualities can be used from one file by switching between sample content and product content.

  In this example, sample content and product content are created independently, and after these are converted in different data formats, they are combined and encrypted to create distribution content. When the user who has obtained the distribution content browses the sample content and desires to use the product content, the user acquires and reproduces license information for decrypting the product content.

  In this example, the sample content and the product content are independent and can be provided by including the original information in the sample content, and the user can browse the sample content and determine its value to determine the product content. This is an excellent method in terms of user service.

  However, the above-described system for dynamically fixing the value using the distributed content is a system for the purpose of preventing unauthorized viewing of the dynamic value fixing service and product content. The digital rights management technology (DRM) for the purpose of protection has not yet been supported.

  FIG. 6 is a diagram for explaining the concept of the dynamic value control system. The content 400 is encrypted by the encryption module 401 and distributed as the encrypted content file 402 on the communication network 1. The dynamic value control player (content reproduction device) 410 that has received the encrypted content file 402 reproduces the encrypted content file 402 using the dynamic value control engine 411. When reproducing the encrypted content file 402, first, in order to acquire a license according to the purpose of use of the user, a “license request” is issued to the license issuing server 420, and the license is acquired from the license issuing server 420. .

  This license includes a decryption key and control information. The encrypted content file 402 is decrypted with this decryption key, and a playback method is selected (value is fixed) based on the control information to play back the content. Do. However, in such a dynamic value control system, the copyright protection processing of the content is not clear, and cooperation with existing copyright book protection technology (DRM) is required.

  FIG. 7 is a diagram for explaining the concept of DRM. The content 500 is encrypted by the DRM encryption module 501 and distributed as a DRM content file 502 on the communication network 1. The DRM content file 502 includes a DRM header 503 and a DRM content 504. The DRM header 503 includes URL (Uniform Resource Locater) information (URL information of the DRM license issue server 520) for acquiring a DRM license from the DRM license issue server 520.

  The DRM player (content reproduction device) 510 that has received the encrypted content file 502 reproduces the encrypted content file 502 using the DRM engine 511. When reproducing the encrypted content file 502, first, a “DRM license request” is issued to the DRM license issuance server 520, a DRM license is acquired from the DRM license issuance server 520, and the DRM content file 502 is obtained by this DRM license. Decrypt and play.

  However, the above-described DRM system is a system whose main purpose is to prevent unauthorized copying for copyright protection, and there is a concern that the use of digital contents is restricted and the service to users is degraded. That is, there is a problem that control information may not be included in the DRM license depending on the DRM, and URL information of the control information issuing server may not be added to the DRM content file depending on the DRM. .

  The present invention has been made in view of the above-described problems, and provides a dynamic value control DRM system and a license that can make use of the advantages of the dynamic value control system and the DRM system without losing the versatility of the DRM. It is an object of the present invention to provide an issue server, a content reproduction device, a dynamic value control and DRM linkage method, and a program.

The present invention has been made to solve the above-described problems. A dynamic value control DRM system of the present invention generates a DRM content from digital content and distributes it, and a DRM license for the DRM content. A DRM license issuance server to be issued; a control information issuance server that issues control information that fixes a value when the DRM content is used; and a content that receives the DRM content, acquires the DRM license and the control information, and plays back the DRM license A dynamic value control DRM system in which a playback device is connected via a communication network, and serves as a common interface between the DRM license issue server and the control information issue server. Issuing DRM license required The DRM content distribution server generates and distributes the DRM content including the identification information of the license issuance server, and the content reproduction device includes the license issuance server included in the DRM content. The control information and the DRM license are acquired from the license issuing server based on the identification information, and the received DRM content is reproduced.
Thus, by treating the DRM license and the control information as separate data, the DRM license issuance process and the control information issuance process become independent from each other, and versatility for the DRM license can be improved.
In addition, by integrating the external interfaces of the DRM license issuing server and the control information issuing server, the DRM license acquisition algorithm by the conventional DRM engine can be applied as it is, so that versatility for the DRM license can be improved. .
Also, by setting the control information in the playback information, the DRM engine can perform all processes from decryption to value control and rendering, and since content data after decryption is not handled directly, security by DRM can be secured. There is no weakening.

The dynamic value control DRM system of the present invention includes a DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issue server that issues a DRM license of the DRM content, and use of the DRM content A license information issuing server connected to a control information issuing server for issuing control information for fixing value sometimes, and a content reproducing apparatus for receiving the DRM content and acquiring and reproducing the DRM license and the control information through a communication network A license issuing server identification information notifying unit for notifying the DRM content distribution server of identification information of the license issuing server and generating DRM content including the identification information of the license issuing server, and the DRM content. A control information issuance request accepting means for accepting a control information issuance request from a content reproduction device for reproducing the content, causing the control information issuance server to issue control information, and transmitting the control information to the content reproduction device; A DRM license issuance request accepting means for accepting a DRM license issuance request, causing the DRM license issuance server to issue a DRM license, and transmitting the DRM license to the content reproduction apparatus.
Thus, by treating the DRM license and the control information as separate data, the DRM license issuance process and the control information issuance process become independent from each other, and versatility for the DRM license can be improved.
In addition, by integrating the external interfaces of the DRM license issuing server and the control information issuing server, the DRM license acquisition algorithm by the conventional DRM engine can be applied as it is, so that versatility for the DRM license can be improved. .

Also, the dynamic value control DRM system of the present invention includes a DRM content distribution server that distributes digital content as DRM content, control information for fixing a value when a DRM license issuance request of the DRM content and the DRM content is used. A license reproduction server connected to a license issuance server that accepts a request for issuance of a license, and a license issuance server identification information obtaining unit that obtains identification information of the license issuance server from the received DRM content; A control information acquisition unit that transmits a control information issuance request to the issuing server and acquires control information; a DRM license acquisition unit that transmits a DRM license issuance request to the license issuance server and acquires a DRM license; and La DRM content decoding means for decoding digital content based on sense, and value control means for generating reproduction information used for reproduction of DRM content from the control information and fixing the value of DRM content based on the reproduction information It is characterized by providing.
Thus, by setting the control information in the reproduction information, the DRM engine can perform all processes from decryption to value control through rendering, and content data after decryption is not handled directly. Will not weaken.

The dynamic value control and DRM cooperation method of the present invention includes a DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issue server that issues a DRM license of the DRM content, and the DRM. A control information issuance server that issues control information for fixing value at the time of use of content and a content reproduction device that receives the DRM content, acquires the DRM license and the control information, and reproduces them are connected via a communication network. A dynamic value control and DRM linkage method in a dynamic value control DRM system, which is a common interface between the DRM license issue server and the control information issue server, and from the content reproduction device, a control information issue request and Issuing DRM license required A process of providing a license issuance server for accepting, a process in which the DRM content distribution server generates and distributes a DRM content including identification information of the license issuance server, and the content playback apparatus is included in the DRM content And acquiring the control information and the DRM license from the license issuing server based on the identification information of the license issuing server, and reproducing the received DRM content.
Thus, by treating the DRM license and the control information as separate data, the DRM license issuance process and the control information issuance process become independent from each other, and versatility for the DRM license can be improved.
In addition, by integrating the external interfaces of the DRM license issuing server and the control information issuing server, the DRM license acquisition algorithm by the conventional DRM engine can be applied as it is, so that versatility for the DRM license can be improved. .
Also, by setting the control information in the playback information, the DRM engine can perform all processes from decryption to value control and rendering, and since content data after decryption is not handled directly, security by DRM can be secured. There is no weakening.

The dynamic value control and DRM cooperation method of the present invention includes a DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issue server that issues a DRM license of the DRM content, and the DRM. A communication information network is connected to a control information issuance server that issues control information for fixing value when using the content, and a content reproduction device that receives the DRM content, acquires the DRM license and the control information, and reproduces the same. A method for linking dynamic value control and DRM in a license issuing server, in order to notify the DRM content distribution server of identification information of the license issuing server and to generate DRM content including the identification information of the license issuing server. License issuer An identification information notification process, a control information issuance request acceptance process for accepting a control information issuance request from a content reproduction apparatus for reproducing the DRM content, causing the control information issuance server to issue control information, and transmitting the control information to the content reproduction apparatus; Receiving a DRM license issuance request from the content reproduction apparatus for reproducing the DRM content, causing the DRM license issuance server to issue a DRM license, and transmitting the DRM license issuance request to the content reproduction apparatus. To do.
Thus, by treating the DRM license and the control information as separate data, the DRM license issuance process and the control information issuance process become independent from each other, and versatility for the DRM license can be improved.
In addition, by integrating the external interfaces of the DRM license issuing server and the control information issuing server, the DRM license acquisition algorithm by the conventional DRM engine can be applied as it is, so that versatility for the DRM license can be improved. .

Also, the dynamic value control and DRM linkage method of the present invention fixes a DRM content distribution server that distributes digital content as DRM content, a DRM license issuance request for the DRM content, and the use of the DRM content. A method for linking dynamic value control and DRM in a content playback apparatus connected via a communication network to a license issuance server that accepts a control information issuance request for identifying the license issuance server from received DRM content. A license issuance server identification information acquisition process to be acquired; a control information issuance request is transmitted to the license issuance server; a control information acquisition process of acquiring control information; and a DRM license issuance request is transmitted to the license issuance server; Obtain a DRM license A DRM license acquisition process, a DRM content decryption process for decoding digital content based on the DRM license, and playback information used for playback of the DRM content from the control information are generated, and the DRM content of the DRM content is generated based on the playback information. And a value control process for fixing the value.
Thus, by setting the control information in the reproduction information, the DRM engine can perform all processes from decryption to value control through rendering, and content data after decryption is not handled directly. Will not weaken.

  Further, the computer program of the present invention fixes a value when a DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issuance server that issues a DRM license of the DRM content, and the DRM content is used. A control information issuance server that issues control information to be converted to a computer of a license issuance server that is connected to a content reproduction device that receives the DRM content and obtains and reproduces the DRM license and the control information via a communication network; A license issuing server identification information notification process for notifying the DRM content distribution server of identification information of the license issuing server and generating DRM content including the identification information of the license issuing server; Control information issuance request acceptance processing for receiving a control information issuance request from a content reproduction device that reproduces content, causing the control information issuance server to issue control information and transmitting the control information to the content reproduction device, and content reproduction for reproducing the DRM content This is a program for receiving a DRM license issuance request from an apparatus, causing the DRM license issuance server to issue a DRM license, and executing a DRM license issuance request acceptance process that is transmitted to a content reproduction apparatus.

  Also, the computer program of the present invention provides a DRM content distribution server that distributes digital content as DRM content, a DRM license issuance request for the DRM content, and a control information issuance request for fixing the value when the DRM content is used. A license issuing server identification information acquisition process for acquiring identification information of the license issuing server from the received DRM content to a computer of a content reproduction apparatus connected to a license issuing server via a communication network, and control to the license issuing server A control information acquisition process for transmitting an information issuance request and acquiring control information; a DRM license acquisition process for transmitting a DRM license issuance request to the license issuance server and acquiring a DRM license; and the DR DRM content decryption processing for decrypting digital content based on the license, and value control processing for generating reproduction information used for reproducing the DRM content from the control information, and fixing the value of the DRM content based on the reproduction information Is a program for executing

In the dynamic value control DRM system and the dynamic value control and DRM linkage method of the present invention, a license issue server serving as a common interface between the DRM license issue server and the control information issue server is provided. Further, identification information (URL information or the like) of the license issuing server is written in the DRM content generated by the DRM content distribution server. Then, the content playback apparatus that has received the DRM content requests the license issuing server to acquire the DRM license and control information based on the identification information of the license issuing server included in the DRM content, and plays back the DRM content.
Thus, by treating the DRM license and the control information as separate data, the DRM license issuance process and the control information issuance process become independent from each other, and versatility for the DRM license can be improved.
In addition, by integrating the external interfaces of the DRM license issuing server and the control information issuing server, the DRM license acquisition algorithm by the conventional DRM engine can be applied as it is, so that versatility for the DRM license can be improved. .
Also, by setting the control information in the playback information, the DRM engine can perform all processes from decryption to value control and rendering, and since content data after decryption is not handled directly, security by DRM can be secured. There is no weakening.

In the license issuance server and the dynamic value control and DRM linkage method of the present invention, the license issuance server notifies the DRM content distribution server of the identification information of the license issuance server, and the DRM content is notified of the license issuance server. Identification information (such as URL information) is included. Also, a control information issuance request and a DRM license issuance request are received from a content reproducing apparatus that reproduces DRM content, the control information issuance server issues control information, and the DRM license issuance server issues a DRM license. Send to device.
Thus, by treating the DRM license and the control information as separate data, the DRM license issuance process and the control information issuance process become independent from each other, and versatility for the DRM license can be improved.
In addition, by integrating the external interfaces of the DRM license issuing server and the control information issuing server, the DRM license acquisition algorithm by the conventional DRM engine can be applied as it is, so that versatility for the DRM license can be improved. .

In the content playback apparatus and dynamic value control and DRM linkage method of the present invention, the content playback apparatus acquires identification information of the license issuing server from the received DRM content, and issues control information to the license issuing server. Send a request and get control information. Also, a DRM license issuance request is transmitted to the license issuance server to obtain the DRM license. Then, based on the DRM license, the digital content is decrypted, and further, reproduction information that uses the DRM content for reproduction is generated from the control information, and the value of the DRM content is fixed and reproduced based on the reproduction information.
Thus, by setting the control information in the reproduction information, the DRM engine can perform all processes from decryption to value control through rendering, and content data after decryption is not handled directly. Will not weaken.

FIG. 1 is a diagram showing an outline of the configuration and processing of a dynamic value control DRM system according to the present invention.
The present invention is a system in which a dynamic value control system and a DRM system are linked. With regard to the components (decryption key and control information) of the license in the dynamic value control system, the decryption key is a DRM license, Control information is distinguished from each other as individual data.

  In addition, a control information issuing server 21 and a DRM license issuing server 22 are provided in the license issuing server 20, and the control information issuing server 21 receives each of the DRM license and the control information from the dynamic value control DRM player (content reproduction device) 30. Accepts requests and distributes processing to each server.

  Further, the DRM encryption module 12 corresponding to the DRM method to be used is used as the encryption module in the dynamic value control method. In addition, identification information (such as a URL) of the license issuing server 20 is passed to the DRM encryption module. Further, the decryption function of the encrypted content is separated from the dynamic value control engine 31 in the dynamic value control method, and the DRM engine 32 processes it. Furthermore, in the dynamic value control DRM player 30, the DRM license and the control information are requested and issued at different times, and control information (value fixed information) is added to the reproduction information.

Next, an overview of processing in the dynamic value control DRM system shown in FIG. 1 will be described.
First, a content file (also simply referred to as “content”) 11 is input to the DRM encryption module 12 (step S1), and URL information (identification information) of the license issuing server 20 is input to the encryption module 12. (Step S2).

  The DRM encryption module 12 generates a DRM content file (also simply referred to as “DRM content”) 13 based on the content file 11 and the URL information of the license issuing server 20 (step S3). The DRM content file 13 includes the URL information of the license issuing server 20 in the DRM header 14.

  Next, the DRM content file 13 is distributed on the communication network 1 and received by the dynamic value control DRM player (content reproduction device) 30 installed on the user's PC (personal computer) or the like (step S4). .

  The dynamic value control DRM player 30 checks whether or not the control information is included in the DRM content file 13 received by the internal dynamic value control engine 31, and if the control information is not included, the license issuance is performed. A “control information issue request” is transmitted to the server 20 (step S5).

  Upon receiving the “control information issuance request” from the dynamic value control engine 31, the license issuance server 20 causes the control information issuance server 21 to perform control information issuance processing, and sends the issued control information to the dynamic value control engine 31. (Step S6).

  The dynamic value control engine 31 receives control information from the license issuing server 20, and generates reproduction information based on this control information (step S7).

  Next, the DRM engine 32 in the dynamic value control DRM player 30 checks whether or not the DRM license is included in the DRM content file 13. A “DRM license issuance request” is transmitted to the server (step S8).

  Upon receiving the “DRM license issuance request” from the dynamic value control engine 31, the license issuance server 20 causes the DRM license issuance server 22 to issue the DRM license, and transmits the issued DRM license to the DRM engine 32. (Step S9).

  The dynamic value control DRM player 30 decrypts and renders the DRM content based on the DRM license and the reproduction information (step S10).

FIG. 2 is a diagram showing a license issuance process in the license issuance server.
When there is an issuance request from the dynamic value control DRM player 30 to the license issuance server 20, the request content of the request source component is determined (step S21), and the control information from the dynamic value control engine 31 is determined. If it is an issue request, control information is issued (step S22). If it is a DRM license issuance request from the DRM engine 32, a DRM license is issued (step S23).

  FIG. 3 is a flowchart showing a process in the dynamic value control DRM player 30. Hereinafter, the process will be described with reference to FIG.

  In the process in the dynamic value control DRM player 30, the dynamic value control process is first performed (step S100), and then the DRM process is performed (step S200).

  In the dynamic value control process, when a DRM content file is received, first, control information in the DRM content file is checked (step S101), and the presence or absence of the control information is determined (step S102).

  If there is no control information, the URL of the license issuance server is acquired from the DRM header 14 of the DRM content file 13 (step S103), a “control information issuance request” is transmitted to the license issuance server 20, and the control information is obtained. Obtain (step S104). The dynamic value control DRM player 30 sets a reproduction operation based on this control information and generates reproduction information (step S105).

  If it is determined in step S102 that there is control information in the DRM content file, control information is set using this control information (step S105).

  When the reproduction information is obtained by the dynamic value control process, the DRM process is performed next. In the DRM process, first, it is checked whether the DRM content file has a DRM license (step S201), and the presence / absence of the DRM license is determined (step S202).

  If there is no control information, the URL of the license issuance server is obtained from the DRM header 14 of the DRM content file 13 (step S203), and a “DRM license request” is transmitted to the license issuance server 20 to obtain the DRM license. (Step S204). When obtaining the DRM license, the dynamic value control DRM player 30 decrypts the encrypted DRM content and renders it according to the reproduction information (step S205).

FIG. 4 is a diagram for explaining the reproduction information.
The reproduction information is information relating to a reproduction schedule used when the DRM engine reproduces the DRM content, and is generated based on the form of the content file. In addition, the dynamic value control engine reflects the control information in the reproduction information.

  FIG. 4A is a diagram showing an example of use of conventional reproduction information. The encrypted content is read (step S301), reproduction information is used when decoding (step S302), and rendering is performed after decryption (step S303).

  FIG. 4B is a diagram showing an example in the case of the present invention. The encrypted content (DRM content) is read (step S401), decoded (decrypted) with the DRM license (step S402), the value is fixed with the reproduction information (step S403), and rendering is performed according to the reproduction information (step S404).

  FIG. 5 shows the functions of each part constituting the dynamic value control DRM system of the present invention in an organized manner, and shows the functions directly related to the present invention.

  The license issuing server identification information receiving function 101 of the DRM content distribution server 10 is a function for receiving identification information (URL or the like) of the license issuing server. The DRM content generation function 102 is a function for generating DRM content from digital content, and is a function for writing the identification information of the license issuing server in the DRM header.

  The control information issuing function 211 of the control information issuing server 21 is a function for issuing control information according to an instruction from the license issuing server 20. The DRM license issuance function 221 of the DRM license issuance server 22 is a function for issuing a DRM license in accordance with an instruction from the license issuance server 20.

The license issuing server 20 has the following functions.
The control information issuance request acceptance function 201 is a function for accepting a control information issuance request from the content reproduction device 30a of a user who reproduces content, causing the control information issuance server 21 to issue control information, and transmitting the control information to the content reproduction device 30a. .
The DRM license issuance request acceptance function 202 is a function for accepting a DRM license issuance request from the content reproduction device 30a of the user who reproduces the content, causing the DRM license issuance server 22 to issue the DRM license, and transmitting it to the content reproduction device 30a. .
The license issuance server identification information notification function 203 is a function for notifying the DRM content distribution server 10 of the identification information of the license issuance server 20 itself.

The content playback device (dynamic value control DRM player) 30a has the following functions.
The license issuance server identification information acquisition function 301 is a function for acquiring the identification information of the license issuance server 20 from the received DRM content.
The control information acquisition function 302 is a function for transmitting a control information issue request to the license issuing server 20 and acquiring the control information.
The DRM license acquisition function 303 is a function for transmitting a DRM license issue request to the license issuing server 20 and acquiring the DRM license.
The DRM content decryption function 304 is a function for decrypting the encrypted DRM content based on the DRM license.
The value control function 305 is a function for generating reproduction information used for reproduction of DRM content from the control information, and fixing and reproducing the value of the DRM content based on the reproduction information.

  As described above, the dynamic value control DRM system of the present invention makes it possible to link DRM, which is a technology for copyright protection of digital contents, with a dynamic value control method for the purpose of improving the service level. Become.

  Further, the above-described license issue server 20, control information issue server 21, DRM license issue server 22, and content reproduction device (dynamic value control DRM player) 30a have a computer system therein.

  A series of processes related to the above-described process is stored in a computer-readable recording medium in the form of a program, and the above-described process is performed by the computer reading and executing this program.

  That is, in the license issuance server 20, the control information issuance server 21, the DRM license issuance server 22, and the content playback apparatus (dynamic value control DRM player) 30a, the central processing unit such as a CPU is ROM, RAM, etc. This program is realized by reading the above program into the main storage device and executing information processing and arithmetic processing.

  Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

The figure which shows the outline | summary of a structure and process of the dynamic value control DRM system by this invention. The figure which shows the license issuing process in a license issuing server. The flowchart which shows the process of the process in a dynamic value control DRM player. The figure for demonstrating reproduction | regeneration information. The figure which shows the function which each part which comprises the dynamic value control DRM system of this invention has. The figure for demonstrating the concept of a dynamic value control system. The figure for demonstrating the concept of DRM.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication network 10 Content delivery server 11 Content file 12 DRM encryption module 13 Content file 14 DRM header 20 License issue server 21 Control information issue server 22 DRM license issue server 30a Content playback device 30 Dynamic value control DRM player (content playback device) )
31 Dynamic Value Control Engine 32 DRM Engine 101 License Issuing Server Identification Information Receiving Function 102 DRM Content Generation Function 201 Control Information Issuing Request Receiving Function 202 DRM License Issuing Request Receiving Function 203 License Issuing Server Identification Information Notifying Function 211 Control Information Issuing Function 221 DRM license issue function 301 License issue server identification information acquisition function 302 Control information acquisition function 303 DRM license acquisition function 304 DRM content decryption function 305 Value control function

Claims (8)

A DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issuance server that issues a DRM license of the DRM content, and control information that issues control information that fixes the value when the DRM content is used A dynamic value control DRM system in which an issue server and a content reproduction device that receives the DRM content, acquires the DRM license and the control information, and reproduces the DRM content are connected via a communication network,
A license issuance server that serves as a common interface between the DRM license issuance server and the control information issuance server and accepts a control information issuance request and a DRM license issuance request from the content reproduction device;
The DRM content distribution server generates and distributes DRM content including identification information of the license issuing server;
The content playback apparatus acquires the control information and the DRM license from the license issuing server based on the identification information of the license issuing server included in the DRM content, and plays back the received DRM content. Dynamic value control DRM system featuring. A DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issuance server that issues a DRM license of the DRM content, and control information that issues control information that fixes the value when the DRM content is used A license issuance server connected via a communication network to an issuance server and a content reproduction apparatus that receives the DRM content and acquires and reproduces the DRM license and the control information;
License issuing server identification information notifying means for notifying the DRM content distribution server of identification information of the license issuing server and generating DRM content including the identification information of the license issuing server;
Control information issuance request accepting means for accepting a control information issuance request from a content reproducing apparatus for reproducing the DRM content, causing the control information issuing server to issue control information, and transmitting the control information to the content reproducing apparatus;
DRM license issuance request accepting means for accepting a DRM license issuance request from a content reproduction device for reproducing the DRM content, causing the DRM license issuance server to issue a DRM license, and transmitting the DRM license to the content reproduction device. License issue server. In a communication network, a DRM content distribution server that distributes digital content as DRM content and a license issue server that receives a request for issuing a DRM license for the DRM content and a request for issuing control information for fixing the value when the DRM content is used. A connected content playback device,
License issuing server identification information acquisition means for acquiring identification information of the license issuing server from the received DRM content;
A control information acquisition means for transmitting a control information issue request to the license issuing server and acquiring the control information;
A DRM license acquisition means for transmitting a DRM license issuance request to the license issuing server and acquiring a DRM license;
DRM content decrypting means for decrypting digital content based on the DRM license;
A content playback apparatus comprising: value control means for generating playback information used for playback of DRM content from the control information, and fixing the value of the DRM content based on the playback information. A DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issuance server that issues a DRM license of the DRM content, and control information that issues control information that fixes the value when the DRM content is used Dynamic value control and DRM cooperation method in a dynamic value control DRM system in which an issue server and a content reproduction apparatus that receives the DRM content and acquires and reproduces the DRM license and the control information are connected via a communication network Because
Providing a license issuance server that serves as a common interface between the DRM license issuance server and the control information issuance server, and receives a control information issuance request and a DRM license issuance request from the content reproduction device;
The DRM content distribution server generates and distributes DRM content including identification information of the license issuing server;
The content playback apparatus acquires the control information and the DRM license from the license issuing server based on the identification information of the license issuing server included in the DRM content, and plays back the received DRM content. A method for linking dynamic value control and DRM, characterized by comprising: A DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issuance server that issues a DRM license of the DRM content, and control information that issues control information that fixes the value when the DRM content is used A dynamic value control and DRM cooperation method in a license issuance server connected via a communication network to an issuance server and a content reproduction apparatus that receives the DRM content and acquires and reproduces the DRM license and the control information. ,
A license issuing server identification information notifying process for notifying the DRM content distribution server of identification information of the license issuing server and generating DRM content including the identification information of the license issuing server;
A control information issuance request acceptance process for accepting a control information issuance request from a content reproduction device for reproducing the DRM content, causing the control information issuance server to issue control information, and transmitting the control information to the content reproduction device;
A DRM license issuance request acceptance process for accepting a DRM license issuance request from the content reproduction apparatus for reproducing the DRM content, causing the DRM license issuance server to issue a DRM license, and transmitting the DRM license to the content reproduction apparatus. Linkage between dynamic value control and DRM. In a communication network, a DRM content distribution server that distributes digital content as DRM content and a license issue server that receives a request for issuing a DRM license for the DRM content and a request for issuing control information for fixing the value when the DRM content is used. A method of linking dynamic value control and DRM in a connected content playback device,
A license issuing server identification information acquisition process for acquiring identification information of the license issuing server from the received DRM content;
A control information acquisition process for transmitting a control information issue request to the license issuing server and acquiring the control information;
A DRM license acquisition process of transmitting a DRM license issuance request to the license issuance server and acquiring a DRM license;
A DRM content decryption process for decrypting digital content based on the DRM license;
Dynamic value control and DRM cooperation, comprising: a value control process for generating reproduction information used for reproduction of DRM content from the control information and fixing the value of the DRM content based on the reproduction information Method. A DRM content distribution server that generates and distributes DRM content from digital content, a DRM license issuance server that issues a DRM license of the DRM content, and control information that issues control information that fixes the value when the DRM content is used A computer of a license issuing server connected via a communication network to an issuing server and a content playback device that receives the DRM content and acquires and plays back the DRM license and the control information;
A license issuing server identification information notification process for notifying the DRM content distribution server of identification information of the license issuing server and generating DRM content including the identification information of the license issuing server;
A control information issuance request acceptance process for accepting a control information issuance request from a content reproduction device for reproducing the DRM content, causing the control information issuance server to issue control information, and transmitting the control information to the content reproduction device;
A program for accepting a DRM license issuance request from a content reproduction device that reproduces the DRM content, causing the DRM license issuance server to issue a DRM license, and transmitting the DRM license issuance request acceptance process to the content reproduction device. In a communication network, a DRM content distribution server that distributes digital content as DRM content and a license issue server that receives a request for issuing a DRM license for the DRM content and a request for issuing control information for fixing the value when the DRM content is used. In the computer of the connected content playback device,
A license issuing server identification information acquisition process for acquiring identification information of the license issuing server from the received DRM content;
A control information acquisition process for transmitting a control information issue request to the license issuing server and acquiring the control information;
A DRM license acquisition process for transmitting a DRM license issuance request to the license issuance server and acquiring a DRM license;
DRM content decryption processing for decrypting digital content based on the DRM license;
A program for generating reproduction information to be used for reproduction of DRM content from the control information, and executing value control processing for fixing the value of the DRM content based on the reproduction information.

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