Xdelta was designed and implemented by Joshua MacDonald. This package was debianized by Lepied on Wed, 15 Oct 1997 08:23:13 +0200. The current Debian maintainer is LaMont Jones It was downloaded from http://sourceforge.net/projects/xdelta From the upstream AUTHORS file: The author is Joshua MacDonald, . The Rsync algorithm, which inspired the core delta algorithm, is due to Andrew Tridgell and Paul Mackerras. Copyright: XDelta - A binary delta generator. Copyright (C) 1997, 1998, 1999, 2001 Josh MacDonald 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, a copy of the GNU General Public License is available in /usr/share/common-licenses/GPL.