1. Kim, G., Shin, D., Shin, D.: An efficient methodology for multimedia digital rights management on mobile handset. Proc. the IEEE Trans. on Consumer Electronics 50(4) (November 2004)
2. Cheung, T.-W., Chanson, S.T.: Design and Implementation of a PKI-based End-to-End Secure Infrastructure for Mobile E-Commerce. In: Proc. the IFIP TC6/WG6.1-21st Int’l Conf. on Formal Techniques for Networked and Distributed Systems Table of Contents, vol. 197, pp. 421–442 (2001)
3. Mark, B.: Internet Digital Rights Management Taxanomy. In: Proc. the IETF-51 (August 6, 2001)
4. Paul John, D., Bulter, W.: Digital Rights Management Operating System. United State Patent 6,330,670 (December 11, 2001)
5. Ogston, E., Vassiliadis, S.: A peer-to-peer agent auction. In: Proc. the First Int‘l Joint Conference on Autonomous Agent and Multiagent Systems Part I, Italy, pp. 151–159 (July 2002)