Halibut is copyright (c) 1999-2021 Simon Tatham.

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Halibut contains font metrics derived from the "Font Metrics for PDF
Core 14 Fonts", which carry the following copyright notice and licence:

  Copyright (c) 1985, 1987, 1989, 1990, 1991, 1992, 1993, 1997
  Adobe Systems Incorporated.  All Rights Reserved.

  This file and the 14 PostScript(R) AFM files it accompanies may be
  used, copied, and distributed for any purpose and without charge,
  with or without modification, provided that all copyright notices
  are retained; that the AFM files are not distributed without this
  file; that all modifications to this file or any of the AFM files
  are prominently noted in the modified file(s); and that this
  paragraph is not modified. Adobe Systems has no responsibility or
  obligation to support the use of the AFM files.