一种新的DRM权限跟踪模型*

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。

Novel DRM model for copyright tracking

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 ...