Hi, I want to use PJSIP library as part of my commercial program. I will release any modification to pjsip library as open source. But I will not release my application source code. I have gone through these lines in pjsip licensing faq: http://trac.pjsip.org/repos/wiki/FAQ#licensing " *Using the GNU GPL will require that all the ?released improved versions<http://www.gnu.org/philosophy/pragmatic.html>be free software. This means you can avoid the risk of having to compete with a proprietary modified version of your own work.* We don't want people to take PJSIP, mess it up (erm, improve it), and keep the improvements as proprietary code. On the contrary, we want everybody to enjoy PJSIP and all its improvements, and the only way to make sure of this is by releasing PJSIP as GPL." and also this: "People often think that using GPL-ed software means that other software linked with the GPL software have to be GPL too, hence GPL is considered as viral. *That is not exactly true*. " After going through GPL License Faq, I understood if I release release PJSIP stack as open source GPL with my Commercial application program then I don't need to pay any fee for licensing. I want to release all improvements made to pjsip (there may be no improvements at all) as Open Source. But I will not release my application as open source since it is our own development. Please let me know whether this violates PJSIP GPL license. If this doesn't violate GPL License then I can release my commercial product without royalty fee. I am still searching about GPL Licensing issue. Please guide me on this. Regards Tapas -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120801/012f4d32/attachment-0001.html>