The origional copyright distributed with levee did dot explicitly permit
distribution of modified versions, but I have contacted
David Parsons <orc@pell.chi.il.us>, the author of levee, and he has
agreed to allow levee to be distributed under the following terms:

    * Copyright (c) 1982-1997 David L Parsons
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, without or
    * without modification, are permitted provided that the above
    * copyright notice and this paragraph are duplicated in all such
    * forms and that any documentation, advertising materials, and
    * other materials related to such distribution and use acknowledge
    * that the software was developed by David L Parsons (orc@pell.chi.il.us).
    * My name may not be used to endorse or promote products derived
    * from this software without specific prior written permission.
    * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR
    * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
    * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE.

