Digital Rights Management (DRM) is one of the most important issues in digital library, however it is difficult to balance security and efficiency of DRM system in open network environment, especially when the environment is unauthentic. In this paper, a new and Secure Authentication protocol for Digital Rights Management (SADIRM) is proposed to provide perfect usage control and fair transaction in adaptive information retrieval system, in which a License Finite States Machine (LFSM) is adopted to manage the digital rights under a third part Certificate Authority (CA), thus it is secure and fair for atomic authorization and forced revocation of license dynamically. During the interaction of all transaction stages, a fail-stop digital signature is used for identity authentication, integrity verification, and undeniability. Analysis manifests the proposed protocol is feasible, secure with high integrity and it provides a new and reliable approach for DRM.
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