Red Eclipse is based on Tesseract and Cube Engine 2, both of which are covered under the ZLIB license, you may use the source code so long as you obey this license.
Red Eclipse, Copyright (C) 2009-2019 Quinton Reeves, Lee Salzman Tesseract, http://tesseract.gg/ Copyright (C) 2014-2019 Wouter van Oortmerssen, Lee Salzman, Mike Dysart, Robert Pointon, Quinton Reeves, and Benjamin Segovia Cube Engine 2, http://cubeengine.com/ Copyright (C) 2001-2019 Wouter van Oortmerssen, Lee Salzman, Mike Dysart, Robert Pointon, and Quinton Reeves http://www.opensource.org/licenses/zlib-license.php
This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
- The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
- Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
- This notice may not be removed or altered from any source distribution.
The license covers the source code, shells scripts, and related config files. The included enet network library is covered by an MIT-style license, which is however compatible with the above license for all practical purposes.
Content included in the game (maps, textures, sounds, models etc.) is NOT covered by this license, and may have individual copyrights and distribution restrictions (see individual readmes), note that all content in Red Eclipse is intended to be "open source" friendly and is usually some variation of the Creative Commons license excluding any non-commercial licenses. Red Eclipse does not accept content which has usage restrictions beyond "BY" (By, give credit) and "SA" (Share-alike, share derivative works).
In the absence of an explicit license, content is considered to be covered by the CC-BY-SA license, either version 4.0 or (at your option) any later version, and you may use the content in Red Eclipse so long as you obey individual licensing criteria.
Red Eclipse, Copyright (C) 2009-2019 Red Eclipse Team Creative Commons Attribution ShareAlike 4.0+ License (CC-BY-SA) See cc-by-sa.txt or http://creativecommons.org/licenses/by-sa/4.0/
For a license breakdown of all content in Red Eclipse, see "all-licenses.txt".
The use of copyright and trademarks unique to the Red Eclipse project are in addition governed by the Red Eclipse Mark Policy (see "trademark.txt").