Much of the code and art from this mod were taken nearly unchanged from
Mobs Redo, made by TenPlus1 and many others, and distributed under the
WTFPL license.

https://forum.minetest.net/viewtopic.php?f=11&t=9917


All of the goblin code and art are taken from FreeLikeGNU's Goblins mod,
distributed under the CC-by-SA license.

https://forum.minetest.net/viewtopic.php?f=9&t=13004&hilit=goblins
http://creativecommons.org/licenses/by-sa/3.0/


Some of the code, art and ideas were taken from HeroOfTheWinds' Caverealms
mod, distributed under the WTFPL license.

https://forum.minetest.net/viewtopic.php?f=9&t=9522


The changes I've made to these mods are minor, but crucial to dealing
with an all-underground environment. The mobs don't have vertical
range limits, are less affected by light, and they behave a bit
differently from the originals.



The code for V6 and massive caves was taken from the Minetest code,
distributed under the LGPL 2.1 license, and so is my original code from
this project (so as to comply with GPL requirements).

http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt