This collection of files constitutes the Scheme 48 1.9 distribution.

It is distributed under the following terms:

    Copyright © 1986-2001 Richard Kelsey and Jonathan Rees.
    Copyright © 2001-2007 Michael Sperber and Martin Gasbichler.
    Copyright © 2007-2012 Michael Sperber and Marcus Crestani.
    All rights reserved.
    
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notices, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notices, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
    3. The name of the authors may not be used to endorse or promote products
       derived from this software without specific prior written permission.
    
    THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Scheme 48 1.9 derives from Scheme 48 0.58, which was developed by
Richard Kelsey and Jonathan Rees and incorporates PreScheme 0.5 by
Richard Kelsey.

The distribution includes a number of contributions by permission:

- This distribution includes a bignum arithmetic implementation (files
  c/bignum.c, c/bignum.h, c/bignumint.h) obtained from MIT Scheme.
  See the file contents for license information.

- This distribution contains code for printing floating-point numbers
  by Robert G. Burger, in file c/free.c.  See the file contents for
  license information.

- This distribution includes files 'configure', 'aclocal.m4',
  'config.sub', 'sysdep.h.in' which are output of the 'autoconf' program.  
  The Free Software Foundation gives unlimited permission to copy,
  distribute and modify 'autoconf' output.

- This distribution includes file 'mkinstalldirs' by Noah Friedman, in
  the public domain.

- File INSTALL includes text taken from the 'autoconf' distribution
  from the Free Software Foundation.  See the file contents for
  license information.

- File install-sh is part of X11R6 from the X Consortium.  See the file
  contents for license information.

- This distribution includes code from SRFI reference implementations
  in directory scheme/srfi and in file c/srfi-27.c, all under the
  public domain or available under open-source licenses; see the 
  individual files from this directory for license information.

- This distribution includes code for sorting in directory scheme/sort
  by Olin Shivers, under the public domain.

- This distribution includes code for processing Unicode text 
  contributed by Basis Technology Corporation, otherwise distributed
  under the license above.

- This distributes includes code from the tex2page distribution by
  Dorai Sitaram.  See the files doc/src/css.t2p and doc/src/manual.t2p
  for license information.