中文摘要：

数字权利的动态描述一直都是DRM应用系统研究的热点。提出了一种基于逻辑证书的数字权利的动态描述模型。在定义好相关的逻辑证书和逻辑规则后，利用逻辑推理的方法深入探讨和分析该模型中数字证书逻辑推理过程，通过逻辑推理的方法实现数字权利的动态描述。最后通过简单实例，验证了该方法的可行性。

英文摘要：

At alltimes, dynamic expression of digital rights is always the focus in DRM. This paper presented a kind of dynamic expression model of digital right based logic license. After defining the correlative logic licenses and logic rules, deeply explored and analyzed logic reasoning process of the digital certificate. This model carried out dynamic expression of digital right through the method of logic reasoning. Finally, validated its feasibility with a simple sample.