G.729 includes patents from several companies and is licensed by Sipro Lab Telecom. Sipro Lab Telecom is the authorized Intellectual Property Licensing Administrator for G.729 technology and patent pool. In a number of countries, the use of G.729 may require a license fee and/or royalty fee.
x.264 is licensed under GPL terms. Make sure not to link against this library if you are using a commercial version (closed-source) of iDoubs/Doubango.