I got the OK from Eric to release the NeoLemmix code under CC-BY-NC 4.0.
As the styles are much more problematic copyright-wise, they will
not be licensed under this one, but the style creators will retain full rights themselves. By posting their styles here or sending them to me by PM, they grant others only the right to download and use the styles for the purpose of playing NeoLemmix.
If style creators want to release their work under a more permissive license, they are free to do it by adding a comment in that regard to their style thread. To keep it simple and consistent, I will
not modify the license in the NeoLemmix repo/download, even if style creators ask me to do so!
I noticed that we (since the very early times of Lemmix) credited the wrong person for ZLibEx: Instead of "Eric Turner" it should have been "base2 technologies". I changed the default scroller credits, but if you have level packs with custom credits, you might want to change it there, too.
The license file is attached. I would like to ask everyone to have a look and see whether they spot something incorrect. Especially the style creators (and converters) are encouraged to check whether they are cited correctly as the copyright holders!
PS: If anyone wonders why the file is so huge - the reason is that the Graphics32 library that we use is licensed under LGPL forcing us to include the full LGPL license text as well.