Well, thing is LGPL allows proprietary software to use libraries licensed under it, but proprietary software has to be separated. That's why most of such software actually uses system wide shared libraries. If they ship said libraries with software, then it qualifies as derivative work, and by letter of LGPL cant be copyrighted. If you take any RenPy game, it has said libraries shipped with it, under libs. It doesn't use system wide shared libraries.
RenPy is not LGPL licensed, it's licensed under MIT, yet for purpose of LGPL, it's derivative work of LGPL, and precisely because of it, all requirements of LGPL have to be met. Actually, RenPy
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about it.
RenPy games, are RenpPy, not product of it, but RenPy which runs series of pictures and text.
What they can copyright?
Characters? I am not sure they can.
Their code contributions? It's already open sourced. IE, it's enough to decompile rpc and rpa files, and you can see everything, reverse engineer and what's not. Not to mention it's shipped and cant work without LGPL libraries.
Story... well yes. But it has to be separated in order to
Well, yes, but if they extract their own work from , there is no the game. Why somebody of those actually making a lot of money, like Summertime Saga or ICSTOR never tried to claim copyright?
PS; for automatic part. I already wrote about it. Berne convention does not mention software, not surprisingly as it's legal document of XIX century. Some countries, like US or Germany, interpret software as literary works, but it's applicable only in those countries. That's actually how piracy works, as soon as software is not linked with US DMCA complaints are simply ignored, but I digress here.