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/usr/share/doc/petris/copyright is in petris 1.0.1-8ubuntu1.

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The actual contents of the file can be viewed below.

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This package was debianized by Andree Leidenfrost <aleidenf@bigpond.net.au>.

It was originally downloaded from 
http://home1.stofanet.dk/peter-seidler/ which does not exist anymore.
There is currently no known download location. However, the pristine 
last upstream source is in the petris_1.0.1.orig.tar.gz tarball in the 
Debian archives.

Upstream Author: Peter Seidler <seidler@ifa.au.dk>

Copyright:

  You can do whatever you want with the program, it's Public Domain.
  (however, it would be nice of you to credit me if you found anything
  of this useful).
  The above includes the permission to relicence the program under the
  MIT/X11 licence reproduced below:

  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, and/or sell copies
  of the Software, and to permit persons to whom the Software is furnished to
  do so, provided that the above copyright notice(s) and this permission
  notice appear in all copies of the Software and that both the above
  copyright notice(s) and this permission notice appear in supporting
  documentation.

  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 OF THIRD PARTY RIGHTS.
  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE BE
  LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR
  ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
  IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.