关键词: 数字版权保护, 细粒度授权, 授权管理, 等级密钥

Abstract: With the properties of a new document format CEBX, a segment-based dynamic digital rights management scheme (SDDRM) is proposed to provide document encryption with hierarchical key management and fine-grained rights management which includes authorization adding, authorization update, and authorization aggregation. SDDRM includes a document encryption and packaging protocol, a document request and download protocol and a license request and download protocol. SDDRM can implement “authorization on-demand” and support the reading experience of what you see is what you buy. Further study shows that SDDRM is flexible, secure and provides personalized access control. The proposed scheme maintains the fine-grained protection of an e-document and meets the needs of new business model in digital publishing industry.

Key words: DRM, fine-grained authorization, authorization management, hierarchical key management