I write a word processor and for hyphenation I use data files and some of them are under GPL license like the Irish language one... For the moment these files are written in C/C++ and I'm going to move the data to json files while keeping the license (derivative work)...

Is it legally possible to use these data files in closed-source software?

Thanks for your help, Regards, WCDR

// copyright: Copyright (C) 2004-2015 Kevin P. Scannell
// notice: This file is part of the hyph-utf8 package.
//     See http://www.hyphenation.org/tex for more information on the package,
//     and http://borel.slu.edu/fleiscin/index.html for details on Irish hyphenation.
// language:
//     name: Irish
//     tag: ga
// version: 1.0 (2004-01-23:15:46:12 CST)
// authors:
//   -
//     name: Kevin P. Scannell
//     contact: scanell (at) slu.edu
// licence:
//     - This file available under any of these licences:
//     -
//         name: GPL
//         version: 2
//         or_later: true
//         url: http://www.gnu.org/licenses/gpl-2.0.html
// ...
  • 1
    I wouldn't trust legal advice from random C++ developers anyway. Why not ask Kevin instead?
    – BoP
    Jan 14 at 11:31
  • Because there are a lot of different files, each from one or more different authors, and some of them are dead...
    – WCdr
    Jan 17 at 17:55
  • 3
    Can you please a link to the entire license file. The language includes "...This file available under any of these licences:..." which seems to indicate a dual-licensing situation. Jan 24 at 16:17
  • What data are you going to "copy"? -- sometimes the data (e.g. a list of dictionary words) might be itself count as basically uncopyrightable, either because of what the law says or because of case law. That might be the case here, but obviously you should get legal advice about this point if you're doing anything important with this data.
    – Brandin
    Jan 25 at 9:12
  • While I was looking for the dual-licensing terms of your file I found the following: I don't want to mess with your project and don't want to do the selection of your hyphenation files. But have you already looked at open-source projects like Android, they seem to have files which are under permissive licenses. Jan 25 at 14:55