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Subject: Re: GPL'ed chess software

Author: Jon Dart

Date: 08:16:20 10/13/01

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I've considered releasing under the GPL license. This is very much standard
practice for non-commercial software released under Linux, since Linux itself
and much of its toolset are under GPL. Many Linux vendors will not distribute
software that is not under GPL or an equivalent license. It isn't nearly as
universal in the PC/Windows world.

The main disadvantage of GPL is that you effectively lose control over the
creation of what the copyright office calls "derivative works". Anyone can
modify the code and distribute the modified results. GPL imposes requirements
when you do this but the whole point of GPL is to allow this.

Like other chess program authors, I'm not willing to do this. I don't want
multiple variants of my program by different authors to be released. I don't
want to enter a tournament, either, and find my program matched against a near
clone of itself. It may never happen but GPL allows it to happen.

I am quite unconvinced by RMS's arguments that all software ought to be free (in
the GPL sense). But, please, let's not start a debate about that here.



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