Abstract: DRM (digital rights management) is an important part of the construction of informatization in China. Unfortunately, high investment costs and poor user experience are two issues of DRM for further promotion in practice. Previous studies for DRM focused merely on storage service of cloud computing, lacking of concerning on the advantage of its computing service. This paper proposes a DRM scheme supporting attribute revocation and outsourced decryption in the cloud computing environment. In order to protect the users privacy in the DRM system, we propose that users purchase licenses through anonymous tags. In addition, in order to give full play to the advantages of cloud computing in computing and be flexible, fine-grained revocation of the user’s attributes, a supporting revocation of the outsourcing decryption CP-ABE scheme is proposed. Compared with the existing digital rights management schemes based on cloud computing, the proposed scheme protects content security and user privacy. Besides, it supports flexible access control mechanism and fine-grained user’s attributes revocation, and it is more applicable in the content protection in the cloud computing.

Key words: digital rights management (DRM), cloud computing, outsourced computation, attribute-based encryption (ABE), attribute revocation