Cube Licence Clarification

[forumlurker007]

The last release of Cube states, in it's README:

"Cube is freeware, you may use Cube for any purpose as long as you don't blame me for any damages incurred, and you may freely distribute the cube archive unmodified on any media. If you wish to use the cube source code in any way (available from where you got this), even just a mere build, read the readme.txt file carefully (ZLIB license)."

So moving on to the ZLIB license, against at the time of Cube's last release:

"Copyright © <''year''> <''copyright holders''>

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."

You CAN re-license BSD-style to GPL-style (permissive to copyleft) in cases that do not explicitly state you cannot. Wouter is plainly, wrong. If he does not wish to require derivatives to be open source, that's fine. Derivatives CAN require THEIR derivatives to be open source.

Long story short, AssaultCube Reloaded can certainly be released under the GPL.

EDIT: Just to clarify, what I have said above is that ZLIB is compatible with the GPL. You can relicense a derivative of Cube (or it's derivatives that only use the Cube/ZLIB license) under the GPL. If Wouter doesn't believe that, it's his problem. GNU/FSF has used these new things called "lawyers" to make their licenses, so they probably know what they're talking about- right?

http://www.gnu.org/licenses/license-list.html#ZLib