This file is indexed.

/usr/share/doc/yacas-doc/copyright is in yacas-doc 1.3.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Debian packaging of yacas created by:
   John Lapeyre <lapeyre@physics.arizona.edu>  Fri, 31 Jul 1998 13:04:33 -0700

Upstream source:

http://yacas.sourceforge.net

Author: 

    Ayal Pinkus <apinkus@xs4all.nl>

Copyright:

    Copyright © 1999, Ayal Pinkus <apinkus@xs4all.nl>
                      Serge Winitzki <serge@cosmos.phy.tufts.edu>
                      Jitse Niesen <jn221@damtp.cam.ac.uk>

License:

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License 
  version 2 as published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

This program is released under the GPL version 2, available as 
`/usr/share/common-licenses/GPL-2` on your Debian system.

The Debian packaging is © 2010, Muammar El Khatib <muammarelkhatib@gmail.com> and
is licensed under the GPL-2, see `/usr/share/common-licenses/GPL-2'.