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From: Matthew Glenn Shaver <mshaver@er...> - 2007-06-27 04:16:41
Our group (details at http://www.linuxcnc.org) develops a free software
machine tool control program. One of our best developers extended xfig
to convert electronic drawings to the type of data used as input to
computer controlled machine tools. We try to be diligent about licensing
issues, and the question of GPL compatibility was raised while
considering whether to redistribute his useful work.
_Thanks Very Much_ for your rapid and informative reply!
On Tue, 2007-06-26 at 17:46 -0400, Karl Berry via RT wrote:
> Hi Matt,
> > 1. Can we modify this program and re-license it under the GPL?
> No. In general, you can't legally just appropriate someone else's work
> and change the license. It explicitly gives the requirement "this
> copyright notice remain intact" ...
> > 2. Is this a "GPL-Compatible Free Software License" like those described
> > on this web page?
> > http://www.gnu.org/licenses/license-list.html
> Although I can't make an official determination, my unofficial opinion
> is, yes. It looks like the usual sort of X11/revised BSD/etc.
> permissive non-copyleft thing.
> Hope this helps. Best regards,
> Disclaimer: I am not a lawyer, and this is not official legal advice.