On Saturday, 14 June 2008 at 13:12, Giel van Schijndel wrote:
> I assume that you mean this exception?
> 
> > 3. Following exception to the GPL is granted:
> > 
> > Linking Warzone 2100 statically or dynamically with other modules is
> > making a combined work based on Warzone 2100. Thus, the terms and
> > conditions of the GNU General Public License cover the whole
> > combination.
> 
> Ok, thus far I understand...
> 
> > In addition, as a special exception, the copyright holders of Warzone
> > 2100 give you permission to combine Warzone 2100 with code included in
> > the standard release of libraries that are accessible, redistributable
> > and linkable free of charge. You may copy and distribute such a system
> > following the terms of the GNU GPL for Warzone 2100 and the licenses of
> > the other code concerned.
> 
> Erm what? Did they just grant us permission to add code that has no
> monetary cost to Warzone 2100? Isn't that (and more) covered by the GNU
> GPL already?

No. As you quoted above, the combined work has to be GPL as a whole. The
only exception are system libraries, so GPL programs can run on non-free
systems.

> > Note that people who make modified versions of Warzone 2100 are not
> > obligated to grant this special exception for their modified versions;
> > it is their choice whether to do so. The GNU General Public License
> > gives permission to release a modified version without this exception;
> > this exception also makes it possible to release a modified version
> > which carries forward this exception.
> 
> This part seems obvious as well; they allow us to ignore this exception
> right?

Yes. You can take GPL+exception code and transform it into GPL code (but
not back).

> But now my question, which I cannot get answered by rereading that
> particular piece of text: what the heck is the exception that's granted
> on the conditions set by the GNU GPL?

To link with any free of charge library. Arguably there already was an
implicit exception to link with the non-free DLLs included in the
released source, that was now broadened to include any free of charge
library.

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