Abridged from [https://github.com/minetest/minetest_game/blob/master/LICENSE.txt].
Applies to default_*.png
Files named default_ore_*.png were composited from default_mineral_*.png and default_stone.png.
See README.default.txt for more author information.
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License of media (textures and sounds)
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Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
See README.txt in each mod directory for information about other authors.

Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
http://creativecommons.org/licenses/by-sa/3.0/