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This is the Debian GNU/Linux prepackaged version of the grep program.
Currently Anibal Monsalve Salazar <anibal@debian.org> maintains the
Debian GNU/Linux version of grep.

Robert van der Meulen <rvdm@debian.org> and
Ryan M. Golbeck <rmgolbeck@debian.org>
were the previous maintainers.

Grep is copyrighted as described below:

Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2004,
   2005, 2006, 2007, 2008, 2009 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, 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 Street - Fifth Floor, Boston, MA
   02110-1301, USA.

On a Debian system you can find a copy of this license in
/usr/share/common-licenses/GPL-3.