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Method, device and programme for protecting content

A technology of content, content data, applied in the direction of recording/reproducing by optical methods, preventing unauthorized use of memory, recording information on disk, etc. Issues such as reducing the accuracy of content protection

Inactive Publication Date: 2006-01-04
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the conditions of the license agreement, it is prohibited for the disc manufacturer to repeatedly use the same key management information or to use old key management information
[0019] However, according to studies conducted by the inventors of the present invention, no technical measures have been prepared to prevent the use of key management information prohibited by the license agreement.
Therefore, this method of protecting content cannot reject at least recently identified unauthorized devices and reduces the accuracy of content protection

Method used

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  • Method, device and programme for protecting content
  • Method, device and programme for protecting content
  • Method, device and programme for protecting content

Examples

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no. 1 example

[0047] FIG. 2 shows the structure of an optical disc manufacturer device and a license association device to which the method for protecting content according to the first embodiment of the present invention is applied. In FIG. 2, components similar to those in FIG. 1 are denoted by similar symbols and detailed description thereof will be omitted, and different components will be explained here. Even with regard to the following respective embodiments, redundant descriptions will be omitted.

[0048] That is, the first embodiment can detect a recording medium that is not manufactured using the latest key management information and improve the accuracy of content protection. Specifically, in addition to the key management information MKB and encrypted content shown in FIG. 1, content characteristic information and a digital signature are recorded on the DVD 30A as an example of a recording medium. Therefore, the structures of the optical disc manufacturer device 10A and the li...

no. 2 example

[0106] Fig. 9 shows a schematic diagram of an optical disc manufacturer device and a licensing association device according to a second embodiment of the present invention.

[0107] This second embodiment is a modified example of the first embodiment, which differs from the first embodiment in distributing the key management information every time a title disk is produced, but similar to the conventional technology, collectively distributing a plurality of key management information in advance. Design on the premise of key management information. This premise matches in particular the case where the key issuing procedure and the signing procedure at the licensing association are managed separately.

[0108] The optical disc manufacturer device 10B has an issue request unit 12, a storage device 13, and a key management selection unit 14B in addition to the above-mentioned respective units 11A, 17. The encryption unit 15B is designed to perform the above-mentioned encryption fu...

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PUM

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Abstract

According to a first aspect of the present invention, a recording medium manufactured without using the latest key management information can be detected and accuracy of content protection can be improved. A license association apparatus generates a digital signature uniquely corresponding to the latest key management information and content data. A disc manufacturer apparatus writes this digital signature together with the key management information, encrypted content, content feature information onto a DVD. Accordingly, the recording media manufactured without using the latest key management information can be detected by confirming unique correspondence among the key management information, the content feature information and the digital signature and unique correspondence between the encrypted content and the content feature information, in advance of playback.

Description

[0001] Cross References to Related Applications [0002] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2004-181100 filed on June 18, 2004, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a method, device and program for protecting content to protect computerized content from illegal playback. More specifically, the present invention relates to a method, apparatus and program capable of detecting recording media (recordable and / or pre-recordable media) that are not manufactured using the latest key management information. Background technique [0004] In recent years, methods for protecting content have come to be used to protect content from unauthorized copying when recording content data (hereinafter referred to as content) of movies, music, etc. on a recording medium such as a digital versatile disc (DVD). resulting in illegal repla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10G11B19/04G11B7/00G06F12/14G06F21/10G06F21/60G06F21/62G06F21/64
CPCH04L2463/101H04L9/083H04L9/3247H04L63/06H04L2209/603
Inventor 加藤拓石原淳
Owner KK TOSHIBA
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