In this demonstration we present the ARMS system which enables secure and adaptive rich media streaming to a large-scale, heterogeneous client population. The ARMS system dynamically adapts streams to available bandwidth, client capabilities, packet loss, and administratively imposed policies - all while maintaining full content security. The ARMS system is completely standards compliant and to our knowledge is the first such end-to-end MPEG-4-based system. Categories and Subject Descriptors H.3.4 [Information Storage and Retrieval]: Systems and Software—Distributed Systems General Terms Design, Security, Standardization Keywords Adaptive, Encrypted, MPEG-4, video server,streaming, Scalability