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/usr/share/doc/netmask/copyright is in netmask 2.3.12.

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Netmask was written and debianized by Robert Stone <talby@debian.org>.

License:

 Copyright  1999 by Robert Stone

 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.
 
 On Debian systems, the complete text of the GNU General Public License
 can be found in `/usr/share/common-licenses/GPL-2'.