Copyright for xdelta source package in Xenial

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.