Content group digital copyright protection method and system

Abstract

Said method includes when content subsystem receiving content groups, obtaining groups encryption key and each content encryption key, using each content encryption key to generate each content cryptogram, using said groups encryption key ciphering said content encryption key and obtaining each content encryption key cryptogram. Authorized subsystem receives content groups authorization request, then obtaining groups encryption key and establishing unified authorization message for content groups. DRM proxy obtains groups encryption key and authorization message from authorized subsystem, obtaining content encryption key cryptogram and content cryptogram from content subsystem; using obtained groups encryption key deciphering said content encryption key cryptogram to obtain content encryption key clear text; using content encryption key clear text deciphering content cryptogram to obtain content clear text, according to authorization message using said each content clear text. Present invention also discloses a system, adopting the present invented method and system capable of realizing content groups flexible authorization.

Description

technical field [0001] The invention relates to digital copyright protection technology, in particular to a digital copyright protection method and system for content groups. Background technique [0002] Digital content services are characterized by high quality, customization, and interaction, which can bring users more attractive business experience and bring greater profit space for content providers and operators. At the same time, illegal copying of digital content has also become a piracy group. main goal of . Digital copyright protection is to ensure that digital content is not illegally copied through necessary technical means, protect the interests of digital content providers and operators, and provide users with better services. At present, in any digital content service field, digital copyright protection is involved. For example: Internet TV (IPTV) services supporting live broadcast, broadcast and on-demand, mobile streaming media services, digital music, rin...

AI Technical Summary

Problems solved by technology

Since each content of the same group is authorized as a whole, multiple authorization information corresponding to each content will form an obstacle to maintain the consistency of authorization information

Moreover, the authorization subsystem needs to construct a set of information including content identification, content hash information, content key encapsulation and authorization information as shown in Figure 1 for each content, and the DRM agent also needs to control the content key of each content. Encapsulation, authorization information, etc. are processed, resulting in low overall system processing efficiency and high management complexity

[0007] Therefore, the existing digital copyright technology is still difficult to support the flexible combination authorization of content groups, which seriously limits the development of content group services

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