关键词: 版权保护, 数字水印, 协议设计, 协议攻击, 协议层安全

Abstract: Based on the analysis of security threat and using watermarking technology and encryption technology，a protocol security model of copyright marking system is proposed.Through protocol mechanism with digital watermarking technology，the proposed protocol security model can resistant to the protocol attack effectively，and protects not only the benefit of the copyright owners but also the benefit of the purchasers.The design of the protocol security model reflects the effectiveness and the convenience of making use of protocol techniques to counteract protocol attacks.

Key words: digital rights management, digital watermarking, protocol design, protocol attacks, protocol layer security