Can I use GPLv2 dictionary files through an LGPL library in proprietary software?

Question

I am considering writing and distributing a proprietary application that links against NHunspell (GPL, LGPL and MPL licensed) for spell checking. So far so good. However, many of the dictionary files on the Open Office web site are under the GPLv2 license.

Question: Ethical considerations aside, would it be legal for me to distribute that proprietary application with those unmodified GPL dictionary files and use them, without the application itself being GPL?

As an aside, isn't it kind of odd to license data files under the GPL? I cannot personally see e.g. how the linking restriction clauses of the license could apply in my case. Or would a GPL dictionary file force me to use the GPL license of NHunspell, also forcing me to license the entire work as GPL?

Answer 1

It is mostly ineffectual to license content under the GPL, since the GPL's provisions all apply to code and "compiled" works. It is an easy mistake to make though, and not necessarily that uncommon. There are several much better choices for a license.

But to answer your question, you can freely use GPL content with code that uses other licenses provided you comply with the clauses regarding acquisition of the source, and creation of derivative works.

Answer 2

I don't see an ethical or legal problem with that... provided you do actually comply with the GPL requirement for the dictionaries themselves. If they're not compiled, you can't fail to do that, since they are their own source code. It would be as well to link to the upstream source of those dictionaries in addition.

Answer 3

If you did not modify the files, then you can do whatever you want with it as long as you give credit to the author and add a GPL licence copy in your package. If you did modified the files, then you must distribute the modified dictionary source files under a GPL licence.

Therefor, if you distribute your app with uncompiled dictionaries and a copy of the GPL licence, there is not much else to do.

As long as you respect that, there is no ethical issues with it. GPL is not made to prevent proprietary software to exist. It is made to spread free software.