COPYING.txt

GEM - Graphics Environment for Multimedia
Copyright © 1997-2000 Mark Danks
Copyright © Günter Geiger
Copyright © 2001-2019 IOhannes m zmölnig,
Copyright © 2003-2007 James Tittle II,
Copyright © 2003-2008 Chris Clepper

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
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 General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see <http://www.gnu.org/licenses/>.

In the official GEM distribution, the GNU General Public License is
in the file GnuGPL.LICENSE

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             ACKNOWLEDGMENTS

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Not all of the source code provided here has entirely been written by me.
I would like to point at the great openGL-tutorials at http://nehe.gamedev.net
Since these are tutorials, there is no copyright notice here.
Some of the pix_fx code is borrowed from effecTV by Kentarou Fukuchi et al.
at http://effectv.sourceforge.net released under the Gnu GPL, some other pix_fx
code has been ported from Pete Warden's fine collection of FreeFrame plugins at
http://petewarden.com released under the Gnu GPL.

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             OTHER COPYRIGHT NOTICES

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particle:
    Author: David McAllister
            davemc[AT]cs.unc.edu
            http://www.cs.unc.edu/~davemc/Particle/
    Copyright (c) 1998 David K. McAllister
    License: GNU Lesser General Public License, version 2.1 or later