多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。
Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.
多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。
Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.
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