The list of named character references, entities.json, is part of the HTML
Living Standard (https://html.spec.whatwg.org/), whose terms are:

  Copyright © WHATWG (Apple, Google, Mozilla, Microsoft). This work is
  licensed under a Creative Commons Attribution 4.0 International License.
  To the extent portions of it are incorporated into source code, such
  portions in the source code are licensed under the BSD 3-Clause License
  instead.

The list is incorporated into hMailServer's source code - as the table
build/generate-html-references.py writes from it, HtmlReferencesData.cpp - and
so is under the BSD 3-Clause License, which follows
(https://opensource.org/license/bsd-3-clause).

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