KR101073836B1 - An efficient management and operation method of the license on the digtal rights management system - Google Patents

Abstract

The present invention is to provide an efficient license management method for a plurality of digital content delivered to the user in a copyright protection system, which separates information on common terms of use from license information for a plurality of copyrighted digital content. Process of notifying that the common terms of use exist as separate information in a part of the license information, and providing the common terms of use valid in the copyrighted user system only to users who satisfy the conditions. And a process in which the copyright protection service system delivers the license information separated from the copyright protected digital content and the common use condition to the user system, and the common use condition in the license information when the copyright protected user system uses the copyright protected content. Information exists The process of checking the license information, requesting the common use condition information to the copyright protection service system if the common use condition information does not exist inside the copyright protection user system, and using the common use condition information if the common use condition information exists inside the user system. Validity of the digital content protected by copyright only if validity information and valid common use information are available to the copyright protection system. Characterized in that the process to enable the use.

Copyright Protection System, License, Common Terms of Use, DRM, License, Common Condition

Description

An efficient management and operation method of the license on the digtal rights management system}

1 is a system schematic diagram of an interface between a general content providing service system, a copyright protection service system, and a user system;

2 is a functional system schematic diagram showing a relationship between copyrighted digital content and license information in a general copyright protected user system;

3 is a diagram showing the structure of a license in a general copyright protection system;

4 is a diagram illustrating a relationship between license information and common use condition information in an MPEG-21 license form according to an embodiment of the present invention;

5 is a system schematic diagram of an interface between a content providing service system, a copyright protection service system, and a user system including common usage condition information according to an embodiment of the present invention;

6 is a functional system schematic diagram illustrating a relationship between license information and common license condition information in a copyright protected user system according to an embodiment of the present invention;

7 is a functional flow diagram of a license check in a copyright protected user system including common use condition information management according to the present invention.

<Description of the symbols for the main parts of the drawings>

Fig. 1

30: license check block

40: License Information Archive

50: network

60: encrypted content decryption block

70: encrypted content request and reception block

80: license request and reception block

90: copyright protection service management block

100: copyright protection service system block

110: Copyright Protection User System Block

120: content provision service system block

[Figure 2]

200: encrypted content A

210: encrypted content B

220: encrypted content C

230: encrypted content D

240: License Information CD

250: License Information Group

3

300: License

310: Content Information

320: permission information

330: Terms of use information

340: Device / User Information

[Fig 4]

400: License Information 1

410: license information 2

420: Common Terms of Use Information

440: common use condition information identifier

450: Common license condition information identifier

Fig. 5

510: Common condition request and reception block

520: common condition request information receiving block

530: Common conditional generation and encryption block

540: common use condition information transmission block

550: Common license condition information registration request block

560: Archive common license information

Figure 6

600: period condition information

620: Common Terms of Use Information

640: license information A '

650: License Information B '

660: License Information C '

670: License Information D '

1. "Protected content distribution system" (US Patent, US 6,824,051 B2)

2. "Method and apparatus for hierarchical assignment of rights to documents and documents having such rights" (US patent, US 6,895,503 B2)

3. "A scalable digital rights management framework for large-scale content distribution" (Proceedings of 2005 International Symposium on Intelligent Signal Processing and Communication Systems, December 13-16, 2005 Hong Kong)

4. "The new method of license key management for content distribution system"-key management for grouping content-(Proceedings of the IEEE International Symposium on Consumer Electronics, ISCE, pp. 56-57, 2003)

5. "User-Attributed Rights in DRM" (DRMTICS 2005, LNCS 3919, pp. 75-89, 2006)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copyright protection system for digital contents, and more particularly, to a technology for separating and managing usage condition information commonly used by a plurality of encrypted contents from license information referred to for using encrypted digital contents. Because digital contents are easy to copy and distribute due to the characteristics of media, they are likely to be illegally used and are distributed and managed by a copyright protection system using digital contents protection technology such as DRM (Digital Rights Management). When a user wants to use digital content protected by the copyright protection system, the copyright protection user system receives a license provided by the copyright protection service system and determines whether the content can be used based on this. License 300 includes identifier information 310 of the content being licensed, identifier information 340 for the person or device being licensed, permission information 320 being licensed for use, and restrictions and conditions for use. Consists of the conditions of use information 330 to specify (Fig. 3).

1 is a system schematic diagram of an interface between a general content providing service system, a copyright protection service system, and a user system. The 'content provision service system' 120 registers the license information for encrypting the content and using the same in the 'copyright protection service system' 100. The 'copyright protection user system' 110 receives encrypted content from the 'content providing service system' 120 and receives encrypted license information containing license information from the 'copyright protection service system' 100. After decoding, it is used through the rendering process.

FIG. 2 is a system schematic diagram illustrating a process in which a license check block 30 checks whether encrypted content can be used in some functions of a general 'copyright protected user system' 110. 'Encrypted Content Request and Receive Block' 70 receives encrypted content (200,210,220,230) from 'Content Providing Service System' 120 and 'License Request and Receive Block' 80 protects the 'copyright' to use the content. The license information is requested to the service system '100. Since the 'copyright protection service system' 100 provides the license information, since the relationship between the encrypted content and the license is mostly limited to 1: 1, a plurality of licenses are required to manage copyrights of the plurality of encrypted content. It is required. This approach implies an inefficient problem in reissuing and managing licenses when the content usage conditions 330 specified in the license 300 are commonly applied to a plurality of contents. For example, a user who downloads and uses copyright-protected music content through a mobile phone download music service in a monthly fee form has a license with a monthly term. The license for music content becomes invalid and you will not be able to listen to all downloaded music. In this case, if the user wants to continue to receive the service, the license must be renewed. To this end, the mobile carrier server must reissue the license for music already downloaded by the user. If there are 100 downloaded music contents, up to 100 server connections can occur.

In some cases, there may be a way to control multiple encrypted contents with one license 240. However, in this case, the content must be encrypted with one and the same encryption key in relation to the license and the encrypted contents. If the security mechanism is attacked by a hacker, other related contents are all exposed to the same security risk, which is one of the recommended management methods.

Similar inventions include the "Protected content distribution system" (US Pat. No. 6,824,051 B2), but this similar invention relates to the structure of a license and to a method of protecting digital content based on the license. This is different from the way in which licenses are managed efficiently by separating common terms of use.

Another similar invention is "Method and apparatus for hierarchical assignment of rights to documents and documents having such rights" (US Patent, US 6,895,503 B2), but the present invention relates to a hierarchical structure for transferring licenses and usage rights. This is different from the method of efficiently managing licenses by separating common license terms from licenses to be achieved in.

Another similar technology is the "A scalable digital rights management framework for large-scale content distribution" (Proceedings of 2005 International Symposium on Intelligent Signal Processing and Communication Systems, December 13-16, 2005 Hong Kong). By providing a license and key generation mechanism for each group to improve the efficiency of license management for the contents of each group, the purpose of improving the license management efficiency is the same, but the method of separating and managing common terms of use from the license to be achieved in the present invention; There is a difference.

Another similar technique is "The new method of license key management for content distribution system"-key management for grouping content-(Proceedings of the IEEE International Symposium on Consumer Electronics, ISCE, pp. 56-57, 2003) Re-encrypt encryption key for multi-level to prevent decryption of existing content if there is no upper key, and layering these keys to manage keys of multiple contents of lower level with only upper few keys This is different from the method of separating and managing common use conditions from the license to be achieved in the present invention.

Another similar technology, "User-Attributed Rights in DRM" (DRMTICS 2005, LNCS 3919, pp. 75-89, 2006), is a technology that can leak personal information that can occur when a license is issued to each member in a digital home environment. In order to solve the problem, the server issues only a template license to an administrator in the digital home and allows the digital home administrator to issue an additional license within the digital home based on the constraints based on the license. This is different from the method in which the common terms of use are separated and stored in the copyright protection service system, and both license and common terms are sent to the user's system.

Accordingly, the present invention has been made to solve the above problems, the object of the present invention is to separate, store, issue, and manage the use condition information that can be commonly used from the license for the encrypted digital content in the copyright protection content service system The present invention provides a method for efficiently managing licenses for a plurality of contents having similar nature of use conditions.

In an aspect of the present invention for achieving the above object, a process of separating information on common terms of use from license information of a plurality of copyright-protected digital contents, and common terms of use are separately provided as part of the license information. The process of notifying that the system exists, providing the common usage information valid in the copyright protection user system only to users who satisfy the conditions, and sharing the copyright protection digital content with the copyright protected service system. The process of delivering the license information with separated terms to the user's system, the process of confirming that the common license terms exist in the license information when the copyright-protected user system uses the copyrighted content, and the common license information is Exists inside the protected user's system If not, the process of requesting common license information to the copyright protection service system. If the common license information exists inside the user system, the common license terms are validated and the common license information is sent to the copyright protection service system. Requesting, and enabling the copyrighted user system to use copyrighted digital content only when there is both valid license information and valid common use condition information.

Hereinafter, a plurality of embodiments of the present invention may exist, and a preferred embodiment will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate the objects, features and advantages of the present invention through this embodiment.

3 shows that the license 300 used in the general copyright protection system includes the use condition information 330. If the specific use condition information 330 is commonly used in a plurality of licenses, it may be separately managed and managed as 'common use condition information'. 'Identifier' may be used as a reference to the common terms of use for access.

Figure 4 shows that in the embodiment of the use rights according to the present invention, the use condition information 440, 450 is replaced with an identifier for identifying the 'common use condition information' 420 existing outside. Although MPEG-21 REL is used in this embodiment, it can be appreciated by those skilled in the art that various types of REL can be used as another embodiment of the present invention.

5 shows a system schematic diagram of an interface between a content providing service system, a copyright protection service system, and a user system including common use condition information management. Unlike the general copyright protection system that registers only a license when packaging content, the content providing service system 120 separates the common terms of use from the license and uses the 'common terms of use registration request block' 550 to protect the copyright protection service system 100. In the 'Common Terms of Use Information Archive' (560). The 'copyright protection user system' 110 receives the encrypted content from the 'content providing service system' 120 and receives a license from the 'copyright protection service system' 100 in order to use it. The 'copyright protection user system' 110 checks the validity of the license through the 'license check block' 30, which, unlike in the general copyright protection system, gives the license 400 an 'identifier for common license terms'. If it is confirmed that there is (440,450), the common use condition is imported through the 'common use condition information archive' 550. At this time, if the common license information does not exist in the archive 550 or the existing common license information is not valid at this time, the 'copyright protection service system' ( Request a new or reissue of 'Common Terms of Use Information'. The 'copyright protection service management block' 90 that has received a request for issuing the 'common license information' determines whether the requested user and the user system satisfy the current service condition, and thereby transmits the 'common license information transmission block' 540. Send 'Common Terms of Use Information' valid through. The authentication method for the user system of the 'copyright protection service management block' 90 may use a method used in a general copyright protection system and is not included in the scope of the present invention. When the 'license check block' 30 is able to refer to the 'common license terms' through the 'common license information archive' 550, the license check block 30 checks the validity of both the license and the common license terms to determine whether to use the contents. do.

6 is a system schematic diagram showing a reference relationship between a license and a common use condition in the 'license check block' 30. The license check block 30 provides key information for decrypting the encrypted content to the encrypted content decryption block 60 only when both the license and the common terms of use are valid for the user at this time. Mechanisms for transferring keys are not included in the scope of the present invention as they may employ the methods used in common copyright protection systems. The manner in which the decrypted content is safely rendered in the 'copyright protection user system' 120 may also be used in the general copyright protection system, which is not included in the scope of the present invention. As shown in FIG. 6, a plurality of licenses 640, 650, 660, and 670 may exist in the plurality of encrypted contents 200, 210, 220, and 230. In order to facilitate the renewal of the license when the encrypted contents have the same term of use for one month, 'common use' If the term condition 'is managed as separate information, the effect of updating all four licenses can be obtained by updating only one common use condition after one month.

According to the present invention, the same number of license information is reissued when the multiple license information for a plurality of digital contents previously issued to a user or a group has a common use condition in a copyright protection system for existing digital contents. Instead of doing so, by updating only the common condition information, it is possible to bring about an effect of updating the entire plurality of license information.

Therefore, the present invention can efficiently manage licenses in a business model that provides content such as a monthly mobile phone music download service, a monthly digital picture frame providing service, and a monthly IPTV broadcasting service serviced by a mobile carrier, and a monthly fee form. This can reduce the burden of excessive license delivery.

Claims (24)

A central management system that manages encrypted digital content and its decryption license information, receives encrypted digital content and license information from the central management system, decrypts the received digital content with the corresponding license information, and plays it. In the effective digital content license management and operation method in a copyright protection system including a user system, a) extracting and storing, by the central management system, common use condition information satisfying a preset condition from a plurality of license information; b) providing, by the central management system, encrypted digital content, common use condition information related to the encrypted digital content, and license information in which the common use condition information is separated; c) checking, by the user system, validity of license and common use condition information provided from the central management system; d) the user system playing the corresponding digital content using the license and the common use condition information, Efficient digital content license management and operating method in a copyright protection system, characterized in that the common use condition information using the period information that can use the content or the spatial information including the country and region information that can use the content. The method of claim 1, wherein step a) Efficient digital in the copyright protection system characterized in that the central management system further comprises the step of updating the relevant license information collectively by changing only the common use condition information when the information corresponding to the common use condition information of the license information; How to manage and operate content licenses. The method of claim 1, wherein step a) Efficient digital content license management and operation in a copyright protection system, characterized in that the central management system further comprises replacing the common use condition information of the corresponding license information with an identifier when extracting the common use condition information from the license information. Way. delete delete delete delete delete delete The method of claim 1, wherein step c) Efficient digital content license management in the copyright protection system, characterized in that the user system further comprises the step of requesting valid common use condition information to the central management system if the common use condition information does not exist or is invalid; How it works. delete delete delete delete delete The method of claim 1, wherein b) Efficient digital content license management and operating method in a copyright protection system, characterized in that the central management system further comprises the step of providing the common use condition information by encrypting or digital signature for the security of information. delete The method of claim 1, wherein d) And reproducing the digital content only when the user system has both valid license information and valid common use condition information. delete delete delete The method of claim 1, Characterized by using the information of a playback device capable of playing the content as the common use condition information, the manufacturer, and the device information including the model name information, the user who can use the content, and the user recognition information including the user group information. Efficient digital content license management and operation in copyright protection system. delete delete

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