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/usr/share/doc/libygl4-dev/copyright is in libygl4-dev 4.2e-4.

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The actual contents of the file can be viewed below.

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This package was debianized by Prabhu Ramachandran <prabhu@aero.iitb.ac.in>
and Ramakrishnan Muthukrishnan <rkrishnan@debian.org> on
Wed, 12 Dec 2007 22:16:33 +0530.

It was downloaded from <http://www.thp.uni-duisburg.de/Ygl/>

Upstream Author: 

    Fred Hucht <fred@thp.Uni-Duisburg.de>

Copyright: 

    Copyright (C) 1993-2007 by Fred Hucht <fred@thp.Uni-Duisburg.de>

License:

    GNU LGPL version 2

The Debian packaging is (C) 2007, Prabhu Ramachandran <prabhu@aero.iitb.ac.in>
and Ramakrishnan Muthukrishnan <rkrishnan@debian.org> and is licensed under the GPL, 
see `/usr/share/common-licenses/LGPL-2'.