The bulk of the code is distributed under the terms of the BSD
2-clause licence:

Copyright (c) 2023, Norman Gray <https://nxg.me.uk>
(except where noted below)

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 notice,
     this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "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 AUTHOR OR CONTRIBUTORS
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.

----

Other licences:

  * The files s7.c and s7.h are from the
    [s7](https://ccrma.stanford.edu/software/s7/) distribution.
    They are copyright (various years) Bill Schottstaedt, and released
    under the terms of the ‘BSD zero-clause’ licence.

  * Data from the [Unicode Character
    Database](https://www.unicode.org/ucd/) is incorporated in
    misc/unicode; this is distributed under the Unicode-3.0 licence.

  * There is also a small quantity of GPL and GFDL material.
    See file headers for details.

  * The distribution is intended to conform to the
    [REUSE specification](https://reuse.software) for documenting
    copyrights and licences.  See also file headers throughout, and
    copies of licences in the directory `LICENSES/`.