This is Debian GNU's prepackaged version of GnuPG2, a free PGP replacement. Gnupg was originally packaged by James Troup , from sources obtained from ftp://ftp.gnupg.org/GnuPG/gnupg/gnupg-1.2.4.tar.gz. The changes were minimal, namely: - adding support for the Debian package maintenance scheme, by adding various debian/* files. The current version was obtained from http://ftp.gnupg.org/GnuPG/gnupg/ Program Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. Modifications for Debian Copyright (C) 1998-2004 James Troup. Modifications for Debian Copyright (C) 2004-2005 Matthias Urlichs. GnuPG 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. GnuPG 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 . On Debian GNU/Linux systems, the complete text of the GNU General Public License can be found in `/usr/share/common-licenses/GPL'.