/usr/share/doc/libhdate1/copyright is in libhdate1 1.6-2ubuntu3.
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 25 26 27 28 29 30 31 | This package was debianized by Lior Kaplan <webmaster@guides.co.il> on
Sat, 13 Jul 2005 03:44:18 +0200.
It was downloaded from http://libhdate.sourceforge.net/
Copyright: 
   (C) 2011-2012 Boruch Baum <boruch-baum@users.sourceforge.net>
   (C) 2003-2008 Yaacov Zamir <kzamir@walla.co.il>
   (C) 1984-2003 Amos Shapir <amos083@hotmail.com>
   (C) 2005,2008 Ido Kanner <idokan@gmail.com> - Pascal bindings
Upstream Author: 
   Boruch Baum <boruch-baum@users.sourceforge.net>
License:
 *  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 3 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, see <http://www.gnu.org/licenses/>.
On Debian systems, the complete text of the GNU General
Public License version 3 can be found in `/usr/share/common-licenses/GPL-3'.
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