This is Debian GNU/Linux's prepackaged version of the shadow utilities.

It was downloaded from: <ftp://ftp.pld.org.pl/software/shadow/>. 
As of May 2007, this site is no longer available.

Copyright:

Parts of this software are copyright 1988 - 1994, Julianne Frances Haugh.
All rights reserved.

Parts of this software are copyright 1997 - 2001, Marek Michałkiewicz.
All rights reserved.

Parts of this software are copyright 2001 - 2004, Andrzej Krzysztofowicz
All rights reserved.

Parts of this software are copyright 2000 - 2007, Tomasz Kłoczko.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. Neither the name of Julianne F. Haugh nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.

This source code is currently archived on ftp.uu.net in the
comp.sources.misc portion of the USENET archives.  You may also contact
the author, Julianne F. Haugh, at jockgrrl@ix.netcom.com if you have
any questions regarding this package.

THIS SOFTWARE IS BEING DISTRIBUTED AS-IS.  THE AUTHORS DISCLAIM ALL
LIABILITY FOR ANY CONSEQUENCES OF USE.  THE USER IS SOLELY RESPONSIBLE
FOR THE MAINTENANCE OF THIS SOFTWARE PACKAGE.  THE AUTHORS ARE UNDER NO
OBLIGATION TO PROVIDE MODIFICATIONS OR IMPROVEMENTS.  THE USER IS
ENCOURAGED TO TAKE ANY AND ALL STEPS NEEDED TO PROTECT AGAINST ACCIDENTAL
LOSS OF INFORMATION OR MACHINE RESOURCES.

Special thanks are due to Chip Rosenthal for his fine testing efforts;
to Steve Simmons for his work in porting this code to BSD; and to Bill
Kennedy for his contributions of LaserJet printer time and energies.
Also, thanks for Dennis L. Mumaugh for the initial shadow password
information and to Tony Walton (olapw@olgb1.oliv.co.uk) for the System
V Release 4 changes.  Effort in porting to SunOS has been contributed
by Dr. Michael Newberry (miken@cs.adfa.oz.au) and Micheal J. Miller, Jr.
(mke@kaberd.rain.com).  Effort in porting to AT&T UNIX System V Release
4 has been provided by Andrew Herbert (andrew@werple.pub.uu.oz.au).
Special thanks to Marek Michalkiewicz (marekm@i17linuxb.ists.pwr.wroc.pl)
for taking over the Linux port of this software.

Source files: login_access.c, login_desrpc.c, login_krb.c are derived
from the logdaemon-5.0 package, which is under the following license:

/************************************************************************
* Copyright 1995 by Wietse Venema.  All rights reserved. Individual files
* may be covered by other copyrights (as noted in the file itself.)
*
* This material was originally written and compiled by Wietse Venema at
* Eindhoven University of Technology, The Netherlands, in 1990, 1991,
* 1992, 1993, 1994 and 1995.
*
* Redistribution and use in source and binary forms are permitted
* provided that this entire copyright notice is duplicated in all such
* copies.  
*
* This software is provided "as is" and without any expressed or implied
* warranties, including, without limitation, the implied warranties of
* merchantibility and fitness for any particular purpose.
************************************************************************/

Some parts substantially in src/su.c derived from an ancestor of
su for GNU.  Run a shell with substitute user and group IDs.
Copyright (C) 1992-2003 Free Software Foundation, Inc.

   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, 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 GNU/Linux systems, the complete text of the GNU General Public
   License can be found in '/usr/share/common-licenses/GPL-2'