Author: Gian-Carlo Pascutto
Date: 11:03:24 12/05/00
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On December 05, 2000 at 13:20:05, Dan Andersson wrote: >I would say that its a problem for Amy and ExChess et al, not to Nalimov but >its easy to work around The authors ask Eugene for permission to use the code >and point out what parts if any that are not GPL. For Eugene, there is indeed no problem at all. For Amy and ExChess I think things are not so easy. The GPL says: These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. -> So far so good. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. I think this basically means that if Amy and ExChess want to continue using the Nalimov code they will have to get Eugene to grant a special permission...that effectively puts that code under GPL, or stop distributing their programs under GPL. Using GPL code and non-free code together is a very complex issue. See the whole KDE/Qt drama. I am not suprised running into this with the EGTB code, since it was a piece of code with shaky copyrights that is used in GPL software. I thought about making my own (GPL) tablebase generator, that would be usable for chess variants like suicide also. However, making such a thing efficient and generating all databases is another matter. Nalimov format is very good. >Easy Copyrigth link: > >http://www.templetons.com/brad/copymyths.html It's a nice link but it doesn't help much trying to understand difficult issues like using non-GPL code in a GPL program. -- GCP
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