This file is indexed.

/usr/share/doc/gmt/copyright is in gmt 4.5.11-1build1.

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

The actual contents of the file can be viewed below.

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Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: GMT
Upstream-Contact: Paul Wessel <wessel@soest.hawaii.edu> and Walter Smith <wsmith@nodc.noaa.gov>
Source: http://gmt.soest.hawaii.edu/

File: *
Copyright: 1991-2011 P.Wessel & W.H.F.Smith
License: GPL-2+
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; version 2 or any later version.
 .
 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.
 .
 On Debian GNU/Linux systems, the complete text of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-2'. If 
 you got the source archive you will find the license in the file COPYING 
 in the top directory.