VSNS-BCD Copyright

Copyright 1995/1996 by the author, who agreed to the following conditions for all time :

The text may be redistributed verbatim, in whole or in part, for research and educational purposes only. If distributed in part, it must include this copyright notice, and a pointer (URL) to the full text. It may not be sold, or placed in something else for sale, without explicit permission in writing. The text is provided as is without any express or implied warranty.

The following amendment has been added on Oct 10, 1996, and it shall affect all new or modified versions of documents published on or after that date : ``This text may however not be made available by electronic means unless it is frequently updated from the original site, according to terms that need to be negotiated with the author.''