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/usr/share/doc/arptables/copyright is in arptables 0.0.3.4-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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This package was debianized by Jochen Friedrich <jochen@scram.de> on
Fri, 26 Sep 2003 08:09:38 +0200

It was downloaded from :
http://ebtables.sf.net

Upstream Author: Bart De Schuymer <bdschuym@pandora.be>

Copyright (C) 2000-2002 by the netfilter coreteam <coreteam@netfilter.org>:
                  Paul 'Rusty' Russell <rusty@rustcorp.com.au>
                  Marc Boucher <marc+nf@mbsi.ca>
                  James Morris <jmorris@intercode.com.au>
                  Harald Welte <laforge@gnumonks.org>
                  Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>

Copyright (C) 2003-2007    Bart De Schuymer <bdschuym@pandora.be>

but almost all code is from the iptables userspace program, which has main
authors: Paul Russell <Paul.Russell@rustcorp.com.au>
     and Michael Neuling <mneuling@radlogic.com.au>

 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, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

The GNU GPL may be viewed on Debian systems in /usr/share/common-licenses/GPL