The following notice is included within the VOACAP distribution, 
(obtainable from http://www.greg-hand.com/hf.html);

******************************************************************
Disclaimer:

The software contained within was developed by an agency of the 
U.S. Government. NTIA/ITS has no objection to the use of this
software for any purpose since it is not subject to copyright 
protection in the U.S.

No warranty, expressed or implied, is made by NTIA/ITS or the
U.S. Government as to the accuracy, suitability and functioning 
of the program and related material, nor shall the fact of 
distribution constitute any endorsement by the U.S. Government.
******************************************************************

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