Backport commit f994c20 from Emacs

* doc/orgcard.tex: Update the copyright blurb.  (Bug#24520)

Update copyright text in refcards
f994c2046588b168c1a4a900879cdffaf9d02f01
Eli Zaretskii
Sun Nov 13 18:20:59 2016 +0200

doc/orgcard.tex

@@ -20,13 +20,17 @@
 % Copyright (C) 1987, 1993, 1996-1997, 2001-2016 Free Software
 % Foundation, Inc.
 
-% This file is part of GNU Emacs.
-
 % GNU Emacs 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.
 
+% As a special additional permission, you may distribute reference cards
+% printed, or formatted for printing, with the notice "Released under
+% the terms of the GNU General Public License version 3 or later"
+% instead of the usual distributed-under-the-GNU-GPL notice, and without
+% a copy of the GPL itself.
+
 % GNU Emacs 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
@@ -73,9 +77,8 @@
 \centerline{Author: Philip Rooke}
 \centerline{based on refcard design and format by Stephen Gildea}
 
-Permission is granted to make and distribute copies of
-this card provided the copyright notice and this permission notice
-are preserved on all copies.
+\centerline{Released under the terms of the GNU General Public License}
+\centerline{version 3 or later.}
 
 \endgroup}