Research On DRM Core Technology For Mobile TV

With standard of living improved, demand of people for cultural product is more enhighlighted than before. With the development of science and technology, especially that of television technology, cultural product is pre-sented to people in more lively method. In recent years with the progress of audio and video coding and compression technology, and the evolution of wireless telecommunication, mobile TV is possible and available. As 3G technology becomes more and more mature and the 3G network has been de-ployed, mobile TV, which can be accessed anytime and anywhere, become more and more people's favorite. Mobile TV is faced with great opportunity. Content provider, network operator and device provider participate in the mo-bile TV industry to get a market share.On the other hand, mobile TV is faced with some challenges, such as lack of TV program, the high cost of making program, and so on. Besides, the low intellectual property sense of people has worsened the situation and inva-lid pirate has corrupted the valid righrts of content provider. It's necessary to research on technology to protect the rights of digital content to avoid making the same error as internet, which is spreaded with piratical and obscene video for lack of reliable supervision method. Typical rights protection technology, such as CA, short for Condition Acess, can't be applied to mobile TV for the special content format, special transportation network and special terminal device in mobile TV. Under such background, DRM, short for Digital Rights Management, emerges as the times requires. At present research on DRM mainly focuses on DRM architecture and its specification. The most known specification is OMA DRM, which is proposed by Open Mobile Alliance. With reference to OMA DRM specification, taking the speciality of con-tent, network, and device of mobile TV into consideration, core technology of DRM for mobile TV is researched, including such fields as format-compliant H.264 video and 3GP file encryption methods, key management and triple level distribution system, DRM Agent for identity verification, content de-cryption, and play control. Trusted computing has also been taken into con-sideration for DRM Agent for security reason. DRM architecture, for-mat-compliant H.264 video and 3GP file encryption method, the triple level distribution systm for content encryption key, and DRM Agent basing on trusted computing are of great value to research, implementation and deploy-ment of DRM for mobile TV, even DRM system for other applications.