- 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
- 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
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
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 firstname.lastname@example.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