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 | SVN r24652 | 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 | libvpx |
opencore-amr | 0.1.2 | Apache license 2.0 | optional |
openssl | 0.9.8m | 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