For providing the most flexibility to fulfill requirements of different secure multicast application, the content of the scheme is define with a framework based on policies.

论文安全多播机制采用策略的方式定义机制的内容框架，不同的现代远程教育多播应用可以组合不同的策略满足自己不同的安全多播要求。

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We propose a secure framework for multi-layer multicast applications and introduce the control of group members, the management of secret key and the secure transmission of data.

提出了一种适用于多层组播服务的安全架构，介绍了组成员控制、组密钥管理以及数据的安全传输。

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