maint: update copyrights for 2013 and as per current GNU standards

scripts/backup.sh.in

@@ -1,21 +1,22 @@
 #! /bin/sh
-# This program is part of GNU tar
-# Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
-#
-# This program is free software; you can redistribute it and/or modify
+# Make backups.
+
+# Copyright 2004-2006, 2013 Free Software Foundation, Inc.
+
+# This file is part of GNU tar.
+
+# GNU tar 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 1, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful,
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+
+# GNU tar 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 Street, Fifth Floor, Boston, MA
-# 02110-1301, USA.
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 PROGNAME=`basename $0`
 CONFIGPATH="$SYSCONFDIR/backup"
@@ -339,9 +340,9 @@ remote_run() {
 
 license() {
     cat - <<EOF
-Copyright (C) 2006 Free Software Foundation, Inc.
-This is free software.  You may redistribute copies of it under the terms of
-the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
+Copyright (C) 2013 Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
+This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.
 EOF
 }