中文摘要：

提出的基于身份的DRM权限跟踪模型，即授权用户可以在不同的设备上播放数字内容，提高了互操作性。内容服务器对数字内容部分加密，未加密部分嵌入数字水印。部分加密在保证安全的基础上，减小了计算复杂度。数字水印有双重功能：一是标志该内容受保护；二是颁发许可证依据，许可证服务器根据检测到的水印信息向用户颁发相应的许可证。数字水印是对用户使用权限的定义，数字水印的加载，实现了对数字内容整个生命周期的权限跟踪。分析表明该模型具有很好的安全性和有效性。

英文摘要：

The interoperability was improved by the proposed identity-based DRM model, that was, the content could be played on different device by the authorized user. Encrypted a part of content by content server,embedded meanwhile the watermarking on the rest of content. The model reduced the computational complexity on basis of security. The watermarking had the dual functions： first, it meant that the content was protected, second, according to it, the license server provided corresponding license. Digital watermarking is the definition of user access, through it, can track the digital content for the whole life cycle. Analysis shows that the model is very secure and effective.