If Sendoid is completely relying on RTMFP then the core security technology would have to be coming from Adobe. Check out Matthew Kaufmann's two year old talk on the subject: http://tv.adobe.com/watch/max-2008-develop/future-of-communi... Or Tom Krcha's blog which contains a number of Flash P2P entries: http://www.flashrealtime.com/ RTMFP is pretty fascinating technology that originates with a couple of very smart guys that Adobe brought on board (Matthew Kaufman and Michael Thornburgh). I'm curious if the Sendoid team has a non-Flash solution for 'restricted' devices.