Do a better job of documenting the license

ldap2dns.c

@@ -4,6 +4,22 @@
  * Copyright 2005-2010 by Alkaloid Networks, LLC
  * Copyright 2000-2005 by Jacob Rief <jacob.rief@tiscover.com>
  * License: GPL version 2. See http://www.fsf.org for details
+ *
+ * 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.
+ * 
+ * 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, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301, USA.
  */
 
 #include <lber.h>