Research : Watercasting
2 October 1998 / watercasting
When discussing multicast in the Internet, the loosely coupled model often causes information providers some disquiet. There are a number of reasons for this, but a key issue is the relative anonymity of the receivers: traffic forwarding and group membership are local issues, and at no point is the complete group membership known unless an application level protocol, for example RTCP, is used to provide an approximate list of members. This anonymity implies that it is a simple matter to eavesdrop on, and record, a media stream in an undetectable manner.