The *.scm files in the SRFI-14 implementation are from Scheme 48. This
is an excerpt from Scheme 48's COPYING file.

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.

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