If it's of any assistance, our (my employer, Linn) Songcast protocol is BSD licensed, and available for high precision uni/multicast networked audio. We use it

If it's of any assistance, our (my employer, Linn) Songcast protocol is BSD licensed, and available for high precision uni/multicast networked audio. We use it in the core of our products for multi-room audio. It is much more network focused than bluetooth though * https://github.com/openhome https://github.com/openhome * http://wiki.openhome.org/wiki/Av:Developer:Songcast:Ohm http://wiki.openhome.org/wiki/Av:Developer:Songcast:Ohm * http://wiki.openhome.org/wiki/OhMediaDevelopers http://wiki.openhome.org/wiki/OhMediaDevelopers