With the advent of digital technologies and widening internet bandwidth in recent years there has been a marked rise in new multimedia services. These services include teleconferencing, pay-per-view, interactive simulation, software updates and real-time delivery of stock market information. Security in group communications is an important requirement when the delivery includes confidential or copyrighted data. Proposals for multicast security solutions so far are complex and often require trust in intermediate components or are inefficient. In this paper we present a framework using proxy key encryptions for scalable multicast key management. The solution guarantees perfect forward and backward secrecy. It has very low complexity and overhead. We propose a simple key management solution and discuss its properties.