Calinou wrote:Kenney should publish the source of the game along with the binaries, else they will be in violation of the LGPL.
That's not entirely true. If the minetest (engine) source code is modified then those changes must be published. But there is a gotcha. The thing is LGPL is not really the best license because it is usually used for libraries. In those cases the source code of the library (engine in this case) need not be published by the person using the library (game engine) if the library has not been modified -- mostly because the library/engine would not normally be statically linked. So, the safest way (IMO, IANAL, I am not speaking on behalf of the MT devs, this is my opinion only) is for Kenny to make available the source code to the minetest engine even if they don't make any engine changes at all (and if that's the case just clone/fork the official github repo).
As for the game (i.e. the bunch of Lua, textures, etc, etc), there is no onus on the person making the game to release that code at all (although I'd be disappointed if it was not). There is not restriction on the license they use (for the game, not the engine). The only restriction might be forum imposed restrictions.
Kenny has already stated their intentions and I (personally, not on behalf of the mintest team, yadda, yadda, yadda) can't see any problem at all. It's using the engine for what it's intended to be used for... a "platform" for creating games.