License note:
- each source file has a license enclosed, usually in comments at
  the end of the file
- individual authors have not always used an identical license
  block in their code, yet all the license blocks are for most
  purposes equivalent and compatible with the standard 3 clause
  BSD license
- the bulk of the code is licensed under the terms of the Vovida
  license, which is like the BSD license with a 4th clause
  added restricting the use of the term VOCAL in the name
  of any derivative work.  A full copy of the Vovida license
  is presented below.



   The Vovida Software License, Version 1.0
  
   Copyright (c) 2000-2008 Vovida Networks, Inc.  All rights reserved.
  
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
  
   1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
  
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the
      distribution.
  
   3. The names "VOCAL", "Vovida Open Communication Application Library",
      and "Vovida Open Communication Application Library (VOCAL)" must
      not be used to endorse or promote products derived from this
      software without prior written permission. For written
      permission, please contact vocal@vovida.org.
  
   4. Products derived from this software may not be called "VOCAL", nor
      may "VOCAL" appear in their name, without prior written
      permission of Vovida Networks, Inc.
  
   THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
   NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL VOVIDA
   NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
   IN EXCESS OF $1,000, NOR FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
   USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
   DAMAGE.