Copyright for optipng source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: optipng
Upstream-Contact: Cosmin Truţa 
Source: http://optipng.sourceforge.net/

Files: *
Copyright: 2001-2019, Cosmin Truţa 
License: Zlib

Files: src/cexcept/cexcept.h
Copyright: 2000-2008, Adam M. Costello
           2000-2008, Cosmin Truţa 
License: CEXCEPT_H

Files: src/gifread/gifread.c
Copyright: 1990-1993, David Koblas 
           2003-2011, Cosmin Truţa 
License: MIT

Files: debian/*
Copyright: 2006-2010, Nelson A. de Oliveira 
           2014-2019, Emmanuel Bouthenot 
License: Zlib

Files: debian/3rd-party/optipng-check
Copyright: 2010, Martin Pitt 
License: Zlib

License: CEXCEPT_H
 This software may be modified only if its author and version
 information is updated accurately, and may be redistributed
 only if accompanied by this unaltered notice.  Subject to those
 restrictions, permission is granted to anyone to do anything
 with this software.  The copyright holders make no guarantees
 regarding this software, and are not responsible for any damage
 resulting from its use.

License: MIT
 Permission to use, copy, modify, and distribute this software
 and its documentation for any purpose and without fee is hereby
 granted, provided that the above copyright notice appear in all
 copies and that both that copyright notice and this permission
 notice appear in supporting documentation.  This software is
 provided "as is" without express or implied warranty.

License: Zlib
 This software is provided 'as-is', without any express or implied
 warranty. In no event will the author(s) be held liable for any damages
 arising from the use of this software.
 .
 Permission is granted to anyone to use this software for any purpose,
 including commercial applications, and to alter it and redistribute it
 freely, subject to the following restrictions:
 .
 1. The origin of this software must not be misrepresented; you must not
    claim that you wrote the original software. If you use this software
    in a product, an acknowledgment in the product documentation would be
    appreciated but is not required.
 2. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.
 3. This notice may not be removed or altered from any source distribution.