[linux-audio-user] multichannel streaming

Hallo! We are searching for a streaming-server for a e-learning system at a university, which can manage the following requirements: - open source - multichannel streaming in ogg (or mp3) - one audio-stream is only for one listener (it should be integrated in a zope/plone system, where only registered user can hear the stream - they can choose between various (copy-protected) pieces they want to hear, then a stream should be opened and only the one who opened it can hear it ...) - user should be able to control the audio-stream: play, pause, stop, forward, backward, time seek ... Any suggestions which of the various open source streaming-servers (icecast, freecast, ...) come close to that or already have those features ? Many thanks in advance, LG Georg