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/usr/share/doc/info/copyright is in info 6.1.0.dfsg.1-5.

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The actual contents of the file can be viewed below.

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This is the Debian package of Texinfo, the GNU documentation system.

This package was previously maintained by Ian Jackson, Erick
Branderhorst, Galen Hazelwood, and Josip Rodin. Today, it is 
maintained by the Debian TeX Task Force <debian-tex-maint@lists.debian.org>.

The original source can be found at: http://ftp.gnu.org/gnu/texinfo/

Upstream maintainer: Karl Berry <karl@cs.umb.edu>.

  All programs Copyright (C) 1987, 1992, 1993, 1994, 1995, 1996, 1997, 
  1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
  2010, 2011, 2012
  Free Software Foundation, Inc.

  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 3 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/>.

On Debian GNU/Linux systems, the complete text of the GNU General
Public License v3 can be found in `/usr/share/common-licenses/GPL-3' file.