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/usr/share/doc/nethack-el/copyright is in nethack-el 1:0.9.5-3.

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This package  was debianized by  Mario Lang <mlang@debian.org>  and is
now maintained by Arnaud Fontaine <arnau@debian.org>.

It was downloaded from
   http://www.nongnu.org/nethack-el

Upstream Authors:

   Ryan Yeske <rcyeske@vcn.bc.ca> and
   Shawn Betts <sabetts@vcn.bc.ca>

Copyright:

   Copyright (C) 2000-2008 Ryan Yeske and Shawn Betts.

This program is licensed under the terms of the GNU GPL.

On Debian systems, the complete text of the GNU General Public License
can be found in `/usr/share/common-licenses/GPL'.