A formal conceptual model for rights
Proceedings of the 8th ACM workshop on Digital rights management
On the operational semantics of rights expression languages
Proceedings of the nineth ACM workshop on Digital rights management
An interoperable usage management framework
Proceedings of the tenth annual ACM workshop on Digital rights management
A domain specific language for usage management
Proceedings of the 11th annual ACM workshop on Digital rights management
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This paper discusses how to model digital licenses as observational transition systems (OTSs) with CafeOBJ, a formal algebraic specification language. To extend the concept of licensing to cover various application domains of digital rights management, we first analyze the concepts of permission and obligation with some real-world examples which are not covered by current XML-based Rights Expression Languages (RELs), and then discuss how to formally specify licenses in terms of deontic and temporal logic with OTS/CafeOBJ method. Several important deontic and temporal modeling issues of licenses are also addressed for discussion. The proposed formal license language can be used not only for the formal specifications of licenses which capture both static observations and dynamic state transitions of the licenses, but also for the formal verification of licenses thanks to the executability and theorem proving facility of CafeOBJ.