Copyright for twofish source package in Focal

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: twofish
Upstream-Contact: Niels Ferguson 
Source: http://www.macfergus.com/niels/code/TwofishClib-v0.3.zip

Files: main.c twofish.c twofish.h
Copyright: 2002, Niels Ferguson.
License: other
 The author hereby grants a perpetual license to everybody to use this
 code for any purpose as long as the copyright message is included in the
 source code of this or any derived work.
 .
 Yes, this means that you, your company, your club, and anyone else can
 use this code anywhere you want.  You can change it and distribute it
 under the GPL, include it in your commercial product without releasing
 the source code, put it on the web, etc.  The only thing you cannot do is
 remove my copyright message, or distribute any source code based on this
 implementation that does not include my copyright message.
 .
 I appreciate a mention in the documentation or credits, but I understand
 if that is difficult to do.  I also appreciate it if you tell me where
 and why you used my code.
 .
 DISCLAIMER: As I'm giving away my work for free, I'm of course not going
 to accept any liability of any form.  This code, or the Twofish cipher,
 might very well be flawed; you have been warned.  This software is
 provided as-is, without any kind of warrenty or guarantee.  And that is
 really all you can expect when you download code for free from the
 Internet.

Files: debian/*
Copyright: 2002, Branden Robinson
           2010 - 2016, Mats Erik Andersson
Comment: This package was debianised by Branden Robinson
 on Sun, 22 Sep 2002 14:28:38 -0500.
License: SPI
 Unless otherwise noted, all independently copyrightable modifications and
 additions to twofish found in its Debian packages bear the following copyright
 and license terms:
 .
  Copyright 2002 Software in the Public Interest, Inc.
 .
  Permission is hereby granted, free of charge, to any person obtaining a
  copy of this software and associated documentation files (the "Software"),
  to deal in the Software without restriction, including without limitation
  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  and/or sell copies of the Software, and to permit persons to whom the
  Software is furnished to do so, subject to the following conditions:
 .
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
 .
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  SOFTWARE IN THE PUBLIC INTEREST, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR
  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  DEALINGS IN THE SOFTWARE.