Secure and Flexible Digital Rights Management in a Pervasive Usage Mode

With the development of storage and computing technologies, digital content such as music, digital movies, games, cartoon and DV et al gets more and more popular for entertainment, how to control the rights of the digital content is now becoming a very important issue. In this paper, a secure and flexible Content Protection Secure DRM scheme(named CPSec DRM) is proposed for online/ offline rights management, in which content objects(COs) and rights objects(ROs) were separated respectively, the COs was encrypted by content encryption key(CEK), while ROs was encapsulated rights encryption key(REK) that is related to the device information of end user's, thus even if ROs were illegally copied and spread, however it will not pass the authentication of license verification. As for domain and offline license management, a license transfer scheme was developed for N-total sub-licenses redistribution, once the sub- licenses was released to N copies, then the master license can not be transferred and redistributed again. The proposed CPSec DRM scheme does not only support online rights management, but can still works in an offline mode for pervasive usage.