See
http://code.google.com/p/bigbluebutton/wiki/FAQ#How_do_I_prevent_viewers_from_sharing_their_webcam?
You can't prevent viewers from sharing their audio as it would prevent
them from joining the audio bridge and hearing the presenter (for
example). However, a moderator can mute all other users. In this way,
when viewers join, they can still hear, but they are not transmitting
any audio. See this video
http://bigbluebutton.org/sites/all/videos/presenter/index.html
at 2:09 mark.
Regards,... Fred
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