The emerging multimedia social networks (MSN) services have significantly improved and enriched consumers' experiences on multimedia digital contents, and further spurred the misuse and malicious dissemination of digital media (rights) among users. Thus, Digital Rights Management (DRM) issue is becoming more prominent. The theories and methods for security, trustworthiness, controllability of DRM systems available do not meet the needs of the novel Internet application, which is an urgent problem to solve. This paper analyzed traditional access control technologies and social network properties, and made a survey on related home and abroad research progresses on DRM security technologies, multimedia social networks access control and media contents copyrights protection. Finally, several main research directions were addressed on the key technologies of DRM, from three layers of cloud media services, media networks admission and user social networks, respectively, that is media content access control, media terminal trusted admission and media rights secure distribution.

The contents access and sharing in multimedia social networks (MSNs) mainly rely on access control models and mechanisms. Simple adoptions of security policies in the traditional access control model cannot effectively establish a trust relationship among parties. This paper proposed a novel two-party trust architecture (TPTA) to apply in a generic MSN scenario. According to the architecture, security policies are adopted through game-theoretic analyses and decisions. Based on formalized utilities of security policies and security rules, the choice of security policies in content access is described as a game between the content provider and the content requester. By the game method for the combination of security policies utility and its influences on each party's benefits, the Nash equilibrium is achieved, that is, an optimal and stable combination of security policies, to establish and enhance trust among stakeholders.