The Techage mod for Minetest is

Copyright (C) 2019 Joachim Stolberg  

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

This program is free software; you can redistribute and/or
modify it under the terms of the GNU General Public License version 3 or later
published by the Free Software Foundation.

This library 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
General Public License for more details.

You should have received a copy of the GNU General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
Boston, MA  02110-1301, USA.


License of media (textures, sounds and documentation)
-----------------------------------------------------

All textures, sounds and documentation files are licensed under the
Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
http://creativecommons.org/licenses/by-sa/3.0/