Comment 35 for bug 129081

License holders has been discussed before in this very thread. The speex/ directory is a snapshot of libspeex and libspeexdsp. It includes the COPYING file from that directory. Stefan Gehn and Sebastian Schlingmann have both submitted larger OSX-related patches to Mumble and as such should probably be mentioned in the toplevel LICENSE file. I'll get that fixed.

BTW, before anyone gets confused, Mumble's sourcecode is BSD (revised) licensed, but any binary packages are GPL as you include GPL'd headers when you compile (and link to GPL libraries). So make sure the final package is licensed with GPL. (This is also the reason LICENSE and debian/copyright differ)