ISC License:
  Copyright (c) 2004-2010 by Internet Systems Consortium, Inc. ("ISC")
  Copyright (c) 1995-2003 by Internet Software Consortium
  
  Permission to use, copy, modify, and/or distribute this software
  for any purpose with or without fee is hereby granted,
  provided that the above copyright notice and this permission notice
  appear in all copies.
  
  THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
  FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR
  ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
  THIS SOFTWARE.