[SR-Users] Regd. Kamailio GPL

[Daniel Tryba]

On Tuesday 10 March 2015 14:52:22 Shankar wrote:
> We are exploring kamailio source for use in our VOIP solution. This is the
> first time we are looking at open source. We have few doubts in using
> kamailio for providing our VOIP service. Under GPL any customization
> (customization mainly with respect to interacting with our proprietary
> applications e.g. Billing server)  we do to kamailio also has to be provided
> to the end user. Our doubt is whether we can procure commercial rights to
> our customised code?

You should really contact a lawyer specialised in IP to get good advice. But 
gnu.org points out that above assumption isn't always true:
http://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.html#GPLRequireSourcePostedPublic

"The GPL does not require you to release your modified version. You are free 
to make modifications and use them privately, without ever releasing them. 
This applies to organizations (including companies), too; an organization can 
make a modified version and use it internally without ever releasing it 
outside the organization.

But if you release the modified version to the public in some way, the GPL 
requires you to make the modified source code available to the program's 
users, under the GPL."

So if you don't ship a binary to endusers, you don't have to release source 
(including modifications). It all depends on what you are supplying to your 
endusers (a service or a (complete) software product).