/usr/share/doc/screen-resolution-extra/copyright is in screen-resolution-extra 0.17.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | This package has been debianized by Alberto Milone
<albertomilone@alice.it> on September 21, 2007.
Copyright: (C) 2007, 2008 Alberto Milone.
           (C) 2013 Canonical Ltd.
Authors: 
  Alberto Milone (tseliot) <albertomilone@alice.it>
  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; either version 2 of the License, or
  (at your option) 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.
  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 St, Fifth Floor, Boston, MA  02110-1301 USA
On Debian systems, the complete text of the GNU General
Public License can be found in `/usr/share/common-licenses/GPL'.
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