Board Thread:LotR Mod Technical Support/@comment-29738811-20160910220839/@comment-27190591-20160913092054

No. I'm not a lawyer, but I think if you change the sourcecode and use the modified version of LOTR Mod private-only, there shouldn't be problems. If you write mods for Minecraft, you also have to modify the sourcecode (or use an API like MinecraftForge, which simplifies this). And you can still write coremods, which modify Minecraft code. Of course the mod is not provided under the same terms as Minecraft (as far as I know), but modding should be legal. At least for privete use.