An approach for establishing secure multicast communication among multiple multicast proxy service nodes is disclosed. The multicast proxy service nodes, which can be distributed throughout an enterprise domain, are organized in a logical tree that mimics the logical tree arrangement of domains in a...http://www.google.com.tw/patents/US7103185?utm_source=gb-gplus-share專利 US7103185 - Method and apparatus for distributing and updating private keys of multicast group managers using directory replication
