A method and apparatus for distributing keys in a multicast domain is provided. In a secure multicast domain, a request to join a multicast group for a time period occurs. A key distributor which controls access to the multicast data group determines if the request will be accepted. If the request is...http://www.google.com.tw/patents/US7269728?utm_source=gb-gplus-share專利 US7269728 - Apparatus and method for distributing management keys in a multicast domain
