S-Lang is not free software --- it is copyrighted.  However, it may be used
for any purpose without royalty or fees in accordance with the terms of the
copyright.  The intent of the copyright is to prevent the propagation of
proprietary versions of S-Lang.  To implement this restriction, the
copyright implies that any modification of the S-Lang source code must be
sent back to the author of S-Lang so that such modifications can either be
incorporated into future versions of S-Lang or made available to other
S-Lang users.  I have spent alot of time developing S-Lang and I am letting
you use it for free.  The idea is that any changes you intend to make in the
software should benefit all users of S-Lang.  The restrictions imposed by
the copyright does not apply to the source code embedding embedding S-Lang.

Please note that the S-Lang copyright falls somewhere in between the UCB
copyright and the GNU one.  Unlike GNU software, S-Lang may be used in
commercial software.  Unlike the UCB copyright, changes to S-Lang must be
sent back to me.

Any questions or comments regarding S-Lang should be addressed to me via
email at `davis@amy.tch.harvard.edu' or mailed via the postal service to:

      John E. Davis
      38 Harris St.  #5
      Brookline, MA 02146

--------------------------------------
 Copyright (c) 1992, 1995 John E. Davis
 All rights reserved.

 Permission is hereby granted, without written agreement and without license
 or royalty fees, to use, copy, and distribute this software and its
 documentation for any purpose, provided that the above copyright notice and
 the following two paragraphs appear in all copies of this software.
 Permission is not granted to modify this software for any purpose without
 submitting such modifications back to the author.

 IN NO EVENT SHALL JOHN E. DAVIS BE LIABLE TO ANY PARTY FOR DIRECT,
 INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
 THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOHN E. DAVIS
 HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 JOHN E. DAVIS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
 BASIS, AND JOHN E. DAVIS HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
 SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

