This is the Debian GNU/Linux prepackaged version of the grep program. Currently Anibal Monsalve Salazar maintains the Debian GNU/Linux version of grep. Robert van der Meulen and Ryan M. Golbeck 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.