Tristan Henderson’s Approach
	• Suggest we model it as a mix • Sender pays based on ingress rate and ... • Receivers pay based in share - • Estimate #of receivers periodically • Period is based on statistics of type of session (have lots of studies of games, movies, music “holding times”) http://www.cs.ucl.ac.uk/staff/t.henderson • Assume there’s a pay per content too, so sender already has feedback channel to count receivers  - could be RTCP based or PGMcc or PIM-SSM ...