Fix copyright notice in manpage template.

Yet, we included the copyright text from the respective file. With the
change to the machine-readable format we cannot parse it as part of the
manpage template anymore.
I therefore put in the old copyright text verbatim into the template.

docs/manpage.rst

@@ -121,5 +121,33 @@ examples
 copyright
 ---------
 
-.. include:: ../COPYRIGHT
+Copyright (C) 2015-2018 Uli Fouquet and contributors
 
+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/>.
+
+diceware is a concept invented by Arnold G. Reinhold, Cambridge, Massachusetts
+USA.
+
+The English Diceware Wordlists used with this programme are licensed by Arnold
+G. Reinhold (files ``wordlists/wordlist_en_orig.asc``,
+``wordlists/wordlist_en.txt``) under the `Creative Commons CC-BY 3.0` license
+(see http://creativecommons.org/licenses/by/3.0/).
+
+The Securedrop wordlist (file ``wordlists/wordlist_en_securedrop.asc``) by
+Heartsucker is licensed under the `MIT` license (see http://mit-license.org/).
+
+The EFF wordlist (file ``wordlsts/wordlist_en_eff.txt``) is licensed by the
+Electronic Frontier Foundation under the `Creative Commons CC-BY 3.0 US`
+license (see https://creativecommons.org/licenses/by/3.0/us/).
+
+"Diceware" is a trademark of Arnold G Reinhold, used with permission.