On Fri, Jan 04, 2002 at 02:13:13PM +0800, Andre M. V. wrote:
> Nope. you don't have to use GPL on your 
> developed software using GPL'ed tools, 
> libraries, etc. But if you modify the
> source of a GPL'ed software, anybody
> can ask you for the modifications 
> and you have to give it away.

Common misconception. Clarification rom the FAQ:

http://www.gnu.org/licenses/gpl-faq.html#GPLRequireSourcePostedPublic

Does the GPL require that source code of modified versions be
posted to the public?

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 users, under 
the GPL.

Thus, the GPL gives permission to release the modified program in
certain ways, and not in other ways; but the decision of whether to
release it is up to you.

...

Therefore, the GPL allows you to make money from GPL sources EXCEPT by selling
the modified program (usually as binaries) to the public.  So let's make $$$ !

_
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