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4 Copyright and License

dgrey is copyright © 2008 Oskar Liljeblad.

The source code of this program may contain code from Postgrey, which is copyright © 2004-2007 ETH Zurich copyright © 2007 Open Systems AG, Switzerland

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (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.

See each file of the source code package for license and copyright information.

Permission is granted to copy, distribute and/or modify this documentation under the terms of either:

a) the GNU General Public License (GNU General Public License) as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version, or

b) the GNU Free Documentation License (GNU Free Documentation License), version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.