This is dpkg-repack, a Debian utility by Joey Hess <joeyh@debian.org>.

The following copyright applies to this package:

dpkg-repack is Copyright (c) 1996-2006 by Joey Hess <joeyh@debian.org>

 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.

On Debian systems, the complete text of the GPL is in
/usr/share/common-licenses/GPL