Research on Use Rule Conflict in Digital Content Nested Protection

In this paper we put forward EXrML, which extend the current use rule description tool XrML to solve the problem brought by the digital content nested protection. EXrML has the feature of supporting describing multiple use rules´ same type element comparability. Based on the EXrML we conclude that the root of multiple use rules conflict lies in three elements conflict: principal, right and condition. In order to detect and solve the conflict, we present Use Rules Conflict Detecting algorithm and Consistent Use Rules Creation algorithm. The results confirm the feasibility of the two algorithms, and this study can also be referenced for future studies on the digital content nested protection.