The spell-checker example from section 4.3 is a Copyright 1995 of M. Jazayeri and G.Trausmuth - TU Wien.
Parts of the code and text are subject to the following copyright notice by Hewlett Packard:
/* * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied * warranty. * */
This tutorial is permitted to be used for academic and teaching purposes in whole or in part if the following copyright notice is preserved:
Copyright 1995, J. Weidl - TU Wien
All other use, especially if commercial, can only be granted by the author himself - feel free to contact me.