Authors:
Nikolaos Triantafyllou
;
Iakovos Ouranos
;
Petros Stefaneas
and
Panayiotis Frangos
Affiliation:
National Technical University of Athens, Greece
Keyword(s):
Mobile Digital Rights Systems, OMA-Rights Expression Language, CafeOBJ, Observational Transition Systems, License choice algorithm.
Related
Ontology
Subjects/Areas/Topics:
Information Security Policy for Wireless Networks
;
Mobile Multimedia Services (WASP, ASP, MSP)
;
Mobile Software and Services
;
Standardization Issues
;
Telecommunications
;
Wireless Information Networks and Systems
;
Wireless Information Policy, Risk Assessment and Management
Abstract:
OMA-Digital Rights Management System is a standard proposed by the Open Mobile Alliance (OMA) for protecting digital content distribution via mobile networks. To solve the decision problem, in the case that multiple licenses refer to the same content, OMA suggests a license choice algorithm. This algorithm ensures the fine grained consumption of contents. CafeOBJ is a new generation algebraic specification language. We apply the OTS/CafeOBJ method to formally model, specify and verify the above mentioned license choice algorithm. More specifically, we develop the mathematical model of the OMA decision algorithm as an OTS, a kind of transition system expressed in an equational CafeOBJ specification style. Finally, we verify that this algorithm fulfills the following safety property: Whenever a license is chosen for a given content, then the license is valid at that specific time.