Research On Rights Interaction And Fault Tolerance Authentication In Digital Rights Management

Internet based multimedia application is the evolution trend of multimedia techniques. The combination of networks and multimedia provides users with a flexible and convenient way to obtain multimedia content, and improves users'work efficiency and quality of their lives. While people enjoy the convenient that multimedia technology brings to us, multimedia content also faces serious piracy threat. Network based DRM (Digital Rights Management) is the most promising solution to this problem.The dissertation focuses on research topics of network based DRM. Firstly, we analyze existing DRM system architecture, and summarize related works on network based DRM research topics. We conclude that how to improve rights interaction scheme through technical methods is a key issue in current DRM system. Based on this conclusion, DRM rights sharing and DRM interoperability are firstly studied as our research emphasises. Secondly, we analyze the DRM applicationes and research issues in P2P network. Analysis results show that peer authentication without trusted authority center plays an important role in deploying a secure and stable DRM system in large scale P2P network. The main contribution of this dissertation can be summarized as follows:1. A novel rights sharing scheme based on a light-weighted digital ticket transfer protocol is proposed for online DRM system. We firstly analyze the importance of rights sharing in DRM system and its competence to develop new application and business models. Secondly, a universal digital ticket format is proposed for DRM rights sharing. Thirdly, a novel DRM rights sharing model is given based on proposed sharing scheme and typical DRM system architecture. Lastly, we design a light-weighted rights sharing protocol.2. We implement a prototype system for network based DRM content sharing within online customers using proposed rights sharing scheme based on a light-weighted digital ticket transfer protocol. Key components and their function are presented as well as system work flow. We also propose a novel business model based on proposed rights sharing scheme. The evaluation results indicate that the overhead of our scheme is reasonable compare to other systems.3. A Distributed and Privacy Protected DRM interoperability framework (DPP-DRM) is proposed for digital home network based on CoralIF. The framework locates the role of Domain Manager and Rights Registry to device in a home domain, then the centralized store of transaction record and domain management information becomes distributed store of every user's own privacy information. So the proposed server load is reduced and user privacy is protected. Formal analysis indicates that critical information such as rights token and device management list can be still secure even if the media center is compromised.4. An efficient peer authentication scheme is proposed using cluster based Byzantine fault tolerance authentication for P2P DRM system. Algorithm analysis shows our scheme greatly reduces the number of message during Byzantine agreement procedure.