Xdelta3 was designed and implemented by Joshua MacDonald.
Xdelta3 was downloaded from http://xdelta.org/
but the file draft-korn-vcdiff.txt was deleted
from the original tar file, since it is not freely redistributable.
Copyright:
XDelta3 - A binary delta generator.
Copyright (C) 2001, 2003-2016. Joshua P. 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.