| Digital Rights Management (DRM) is class of systematic approaches that prevent unauthorized redistribution of digital content, and restrict the ways users copy content they’ve already applied. Therefore, the study of digital document rights management has important theoretical and practical significance.For the study of the existing digital documents rights management system, most has focused on the protection of copyright, which has caused great inconvenience to legal users. In addition, those systems lack the effectiveness and flexibility.In this paper, the delegation strategy is introduced into digital document rights management system, and the corresponding system based on delegation is researched and designed. The main work is as follows:1. Existing DRM technology, the principle of delegation and typical delegation model are researched and analyzed. A new delegation model for digital document rights management system is designed, and a digital rights expression model is created according to the new model.2. A digital document rights management system based on the delegation model is designed. It mainly states the designs including license, module of user login, rights of delegation, etc.3. A digital document rights management system based on the delegation model is implemented and tested. The system function includes user registration and login, digital document processing, license generating and management, document authority and delegation, online reading or offline reading, etc. The test results show that the design object has been reached, and the new digital documents right system which includes delegation strategy is reasonable.The implement of the digital document rights management system based on delegation model proves the combination of the delegation stategy and digital document rights management technology is feasible. The controllability of documents right in system has been improved, and it’s also a good balance between system and user or consumer. |
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