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清华信息科学与技术国家实验室 普适计算研究部 数字权利管理关键技术研究 ( Digital Rights Management) Introduction The subject focuses on various security technologies and solutions used for Digital Rights Management including digital watermarking, rights expression language, trust management, license management etc. With the explosive development of network community and media culture, digital content offers an increasing number of opportunities for people. However, the ability for anyone to make perfect copies and the ease by which those copies can be distributed also facilitates misuse, illegal copying and distribution, plagiarism, and misappropriation. There emerges great desire for Digital Rights Management (DRM) systems which can protect the economic value of digital contents and owners’ rights. Publish Server 5. 请求 Streaming Server 6. 节 目表 2.受保护的内容 1.原始内容 节目 表 19.解开后的内容 信息 要 容简 2. 内 Client 14.流化内容 果 结 证 .验 13 3.请求注册 信 证 要 验 简 求 容 .请 2. 内 15.请求许可证 18.签发许可证 果 度结 度 10. 调 求调 7.请 12 Packager 4.身份标识 11.请求服务 Content Provider A Large-scale Live Broadcasting System Supporting DRM Display 果 结 证 . 证 17 验 求验 .请 16 License Server 息 8.请求验证 注册流程，只注册一次，注册过无需再注册 9.验证结果 认证完毕后的主要流程 Authenticating Server Trace Server GridMedia DRM Framework We propose and realize a large-scale live broadcasting system supporting DRM，which streams and distributes real-time contents by media streaming technology, provides scalability to support large scale consumers by application layer multicast technology, let only authorized users access the contents according to the specified usage rules by DRM technology. License Server CA License Database Content Provider Content Packager License Generator Group Identifier Database Content Producer DRM Info License DRM Agent Rights Requirement Items (RRI) Content Decryption Key Generation Module Parameters for Key Generation (PKG) Rights Requirement Items Collection Unit REL Interpreting Unit Payment and Usage Report Consumer Environment Variable Content upload c En Rights Enforcement & Content Decryption Module Content Rendering Software nts nte Co Us rac eT ag Lic Clearing House se en Metadata Trusted DRM Environment Content Provider Decryption Key Generation Unit Encrypted Digital Content ted ryp Client Content Package ContentID encryption Top-level Content Applications Re es qu License DRM Agent k Trusted Rendering Agent t License SN Content ID encryption Decryption Key Usage Rules OtherData Anonymity ID Signature License Package A Scalable DRM Framework for Large Scale Content Distribution License Management Scheme with Anonymous Trust for DRM We propose an efficient Right-granting Model with Hierarchical Group Rights (RMHGR) which can grant rights on some group of contents to a group of consumers. Furthermore, we propose a corresponding DRM framework which differs from previous DRM systems in terms of packaging mechanism, license structure, and content decryption key generation method. We propose a license management scheme named LMSAT (License Management Scheme with Anonymous Trust) which provides a powerful and flexible license acquisition and usage tracking scheme to allow the user access the contents anytime, anywhere, and on any compliant devices anonymously.