回答編集履歴

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追記

2017/04/11 03:29

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  [漢のコンピュータ道 受託開発とGPL](http://nippondanji.blogspot.jp/2010/06/gpl.html)
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+ --追記--
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+ GPL v2の[FAQ](https://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.en.htm)で参考になりそうなもの
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+ > A company is running a modified version of a GPL'ed program on a web site. Does the GPL say they must release their modified sources?
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+ -> The GPL permits anyone to make a modified version and use it without ever distributing it to others. What this company is doing is a special case of that. Therefore, the company does not have to release the modified sources.
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+ > If a library is released under the GPL (not the LGPL), does that mean that any program which uses it has to be under the GPL?
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+ -> Yes, because the program actually links to the library. As such, the terms of the GPL apply to the entire combination. The software modules that link with the library may be under various GPL compatible licenses, but the work as a whole must be licensed under the GPL.
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+ > You have a GPL'ed program that I'd like to link with my code to build a proprietary program. Does the fact that I link with your program mean I have to GPL my program?
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+ ->Yes.
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+ GPL v3の解説ですが、詳しくはこちらのIPAの資料も参考になるかと
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+ [GNU GPL v3 解説書](http://www.ipa.go.jp/osc/license1.html)
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