License of source code
----------------------

GNU Lesser General Public License, version 2.1
Copyright (C) 2011-2017 Kahrl <kahrl@gmx.net>
Copyright (C) 2011-2017 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2012-2017 Various Minetest developers and contributors

This program is free software; you can redistribute it and/or modify it under the terms
of the GNU Lesser General Public License as published by the Free Software Foundation;
either version 2.1 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License for more details:
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
