【作者】 孙伟；

【导师】 翟玉庆；

【作者基本信息】 东南大学 ， 计算机软件与理论， 2005， 硕士

【摘要】 随着越来越多数字内容在Internet上广泛出版与递送,人们迫切希望通过数字权限管理技术来保护数字内容的知识产权,保障作者、出版商、分销商的利益和用户的合法权利。数字权限管理技术的核心之一是数字权限表达模型。本文基于对已有数字权限表达模型的分析比较,提出了一个以动作状态为中心的数字权限表达模型――DDRM模型。DDRM模型的特点是既可描述权限动作与权限动作主体、资源、设备等概念之间的静态关系,又使用时间、次数、费用等概念描述权限动作执行状态,利用权限动作执行状态决定权限动作主体的义务。为了表达基于DDRM模型的权限推理,我们给出了一个基于一阶动态逻辑的逻辑符号系统DrFDL,并使用有限状态自动机模拟了基于DDRM模型的权限推理过程。为了实现基于DDRM模型的权限验证,我们设计了一个基于DDRM模型的权限验证算法,并分析了其时间空间复杂度,同时讨论了权限验证过程中出现的冲突消解方法。最后,基于MPEG REL SDK框架系统,我们构建了一个基于DDRM模型的权限验证原型系统,并对原型系统进行了测试。本文工作对促进数字权限管理技术的发展、保障数字产品知识产权具有一定的意义。更多还原

【Abstract】 As more and more digital contents are being published and delivered via Internet, Digital Rights Management Technology is urgently needed for protecting intellectual property of these digital contents, guaranteeing the legal right and profit of author, publisher, distributor and consumer. The kernel of Digital Rights Management Technology is digital rights expression model.After some existed digital rights expression models were analyzed and compared, a new digital rights expression model based on action states, named as DDRM model, was presented in this paper. DDRM model could not only describe the static relationships among actions, principals, resources, devices and other entities of rights, but also express the action states whose properties include time, number of times, fee and other properties. The action states were used to determine obligations for the principals of these actions. Based on first-order dynamic logic, a logic symbol system, named as DrFDL, was provided for rights reasoning of DDRM model. Finite state automaton was also used to simulate the process of rights reasoning of DDRM model. In order to realize rights validation based on DDRM model, a rights validation algorithm was designed as well as it’s complexity of time and space was analyzed. A method about how to eliminate collisions arising from the process of rights validation of DDRM model was also discussed. Based on MPEG REL SDK framework, rights validation system prototype of DDRM model was designed and realized. Some tests were performed in this system finally.Our work is significant for promoting the development of Digital Rights Management Technology and protecting intellectual property of digital products.更多还原