/usr/share/doc/jailtool/copyright is in jailtool 1.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Source: http://www.westfalen.de/~gb/ 
Name: jailtool 
Files: *
Copyright: 2002, Georg Bauer <gb@bofh.ms> 
License: GPL-2
Files: debian/*
Copyright: 2002-2010, Alexander Neumann <alexander@debian.org>
	   2011, Alexandre De Dommelin <adedommelin@tuxz.net>
License: GPL-2 
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; either version 2 of the License, or
 (at your option) any later version.
 .
 On Debian systems, the complete text of version 2 of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-2'.
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