The framework and demo applications are dual licensed (GPL / commercial) and contains third-parties libraries with commercial-friendly licensing terms.
The framework depends on:

Name Version License Dependency Comments
FFmpeg GIT 1.2 GPL or LGPL optional The commercial version could be linked against the LGPL version as far as the FFmpeg's License Compliance Checklist is respected.
We recommend not using FFmpeg for commercial use
iLBC 1.0 GIPS Public License optional
libgsm 1.0-pl13 BSD optional
libogg 1.1.4 BSD optional
libyuv SVN r321 BSD-style mandatory
libsrtp 1.4.2 BSD-based optional
libtheora 1.1.1 BSD optional
libvorbis 1.2.3 BSD optional
libvpx 1.1.0 BSD optional
libxml2 Git v2.9.1 MIT optional
opencore-amr 0.1.2 Apache license 2.0 optional
openssl 1.0.2a Apache-style License optional
Ragel output 6.7 Doubango License mandatory No linking
SimpleXML 2.3.4 Apache License 2.0 mandatory Only on Android
swig output SVN r12023 Doubango License mandatory No linking
Speex 1.2 Revisited-BSD mandatory
WebRTC audio processing SVN r2512 BSD optional AEC, Noise suppression ...
x264 0.104 GPL optional Must be disbaled for commerical use
OpenH264 GIT v1.1 BSD optional H264 constrained baseline