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Re: Combining GPL and commercial license

From: Merijn de Weerd
Subject: Re: Combining GPL and commercial license
Date: Wed, 16 Aug 2006 20:06:12 +0200
User-agent: slrn/ (FreeBSD)

On 2006-08-16, Marcin Giedz <> wrote:
> I've been searching/googling web sites to find out one question: is it 
> possible to use GPL software/part of code in commercial application WITH 
> VERY visible caption "THIS part comes from xxxx and is based on GPL 
> license"?

What exactly do you mean by "commercial"? You can sell GPL-
licensed software just fine, or provide a commercial service
using GPL-licensed software.

If you want to incorporate GPL code in code you want to keep
proprietary: that's generally not possible. The GPL not only
requires you to acknowledge the presence of GPL software, but
also to make available all source code that has been derived
*from* the GPL software, if you distribute your software.

> We'd like to have 2 licenses for our products - GPL and commercial. But 
> part of code in commercial comes from GPL. This is a little bit like 
> Trolltech's double licese - or at least we see it in this way.

Trolltech can do their dual license because they own all copyrights
to the code in question. But you apparently want to use someone
else's GPL-licensed code. Then you cannot sell a piece of software
derived from that code without also providing everyone the source code.


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