Note that this license is an extension of the original Sauerbraten source code license which is included under the file "readme_sauerbraten.txt" for reference. Both are essentially the ZLIB license, but the Tesseract license  may include differing copyright owners and usage clarifications.

Tesseract source code license, usage, and documentation.

You may use the Tesseract source code if you abide by the ZLIB license http://www.opensource.org/licenses/zlib-license.php (very similar to the BSD license):

LICENSE
=======

Tesseract game engine source code, any release.

Copyright (C) 2014-2019 Wouter van Oortmerssen, Lee Salzman, Mike Dysart, Robert Pointon, Quinton Reeves, and Benjamin Segovia

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:

1. 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.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.

AUTHORS
======
Wouter "Aardappel" van Oortmerssen
http://strlen.com

Lee "eihrul" Salzman 
http://sauerbraten.org/lee/

Mike "Gilt" Dysart

Robert "baby-rabbit" Pointon
http://www.fernlightning.com

Quinton "Quin" Reeves
http://www.redeclipse.net

Benjamin Segovia

For additional authors/contributors, see the Tesseract distribution readme.
