摘要：Researches on digital watermarking technology and fingerprinting are vigorously in progress for protecting intellectual property of digital contents. Digital Rights Management (DRM) is a management and protecting mechanism for authoring, distribution and using of contents as well as intellectual property protection. In this paper, we propose a security protocol for protecting contents securely and for providing convenience to customers. For this goal, we use a Hidden Agent which can be used for preventing illegal copy and use of contents. This hidden agent can play a role as digital watermarking because it is embedded into the contents
关键词：Prevention of illegal copy; information hiding; agent
