diff --color -Naur a/COPYING.txt b/COPYING.txt
--- a/COPYING.txt 1969-12-31 18:00:00
+++ b/COPYING.txt 2023-03-09 14:11:28
@@ -0,0 +1,157 @@
+==================
+ Copying Docutils
+==================
+
+:Author: David Goodger
+:Contact: goodger@python.org
+:Date: $Date: 2022-05-30 18:54:46 +0200 (Mo, 30. Mai 2022) $
+:Web site: https://docutils.sourceforge.io/
+:Copyright: This document has been placed in the public domain.
+
+Most of the files included in this project have been placed in the
+public domain, and therefore have no license requirements and no
+restrictions on copying or usage; see the `Public Domain Dedication`_
+below. There are a few exceptions_, listed below.
+Files in the Sandbox_ are not distributed with Docutils releases and
+may have different license terms.
+
+
+Public Domain Dedication
+========================
+
+The persons who have associated their work with this project (the
+"Dedicator": David Goodger and the many contributors to the Docutils
+project) hereby dedicate the entire copyright, less the exceptions_
+listed below, in the work of authorship known as "Docutils" identified
+below (the "Work") to the public domain.
+
+The primary repository for the Work is the Internet World Wide Web
+site . The Work consists of the
+files within the "docutils" module of the Docutils project Subversion
+repository (http://svn.code.sf.net/p/docutils/code/),
+whose Internet web interface is located at
+. Files dedicated to the
+public domain may be identified by the inclusion, near the beginning
+of each file, of a declaration of the form::
+
+ Copyright: This document/module/DTD/stylesheet/file/etc. has been
+ placed in the public domain.
+
+Dedicator makes this dedication for the benefit of the public at large
+and to the detriment of Dedicator's heirs and successors. Dedicator
+intends this dedication to be an overt act of relinquishment in
+perpetuity of all present and future rights under copyright law,
+whether vested or contingent, in the Work. Dedicator understands that
+such relinquishment of all rights includes the relinquishment of all
+rights to enforce (by lawsuit or otherwise) those copyrights in the
+Work.
+
+Dedicator recognizes that, once placed in the public domain, the Work
+may be freely reproduced, distributed, transmitted, used, modified,
+built upon, or otherwise exploited by anyone for any purpose,
+commercial or non-commercial, and in any way, including by methods
+that have not yet been invented or conceived.
+
+(This dedication is derived from the text of the `Creative Commons
+Public Domain Dedication`. [#]_)
+
+.. [#] Creative Commons has `retired this legal tool`__ and does not
+ recommend that it be applied to works: This tool is based on United
+ States law and may not be applicable outside the US. For dedicating new
+ works to the public domain, Creative Commons recommend the replacement
+ Public Domain Dedication CC0_ (CC zero, "No Rights Reserved"). So does
+ the Free Software Foundation in its license-list_.
+
+ __ http://creativecommons.org/retiredlicenses
+ .. _CC0: http://creativecommons.org/about/cc0
+
+Exceptions
+==========
+
+The exceptions to the `Public Domain Dedication`_ above are:
+
+* docutils/utils/smartquotes.py
+
+ Copyright © 2011 Günter Milde,
+ based on `SmartyPants`_ © 2003 John Gruber
+ (released under a "revised" `BSD 3-Clause License`_ included in the file)
+ and smartypants.py © 2004, 2007 Chad Miller.
+ Released under the terms of the `BSD 2-Clause License`_
+ (`local copy `__).
+
+ .. _SmartyPants: http://daringfireball.net/projects/smartypants/
+
+* docutils/utils/math/latex2mathml.py
+
+ Copyright © Jens Jørgen Mortensen, Günter Milde.
+ Released under the terms of the `BSD 2-Clause License`_
+ (`local copy `__).
+
+* docutils/utils/math/math2html.py,
+ docutils/writers/html5_polyglot/math.css
+
+ Copyright © 2009,2010 Alex Fernández; 2021 Günter Milde
+
+ These files were part of eLyXer_, released under the `GNU
+ General Public License`_ version 3 or later. The author relicensed
+ them for Docutils under the terms of the `BSD 2-Clause License`_
+ (`local copy `__).
+
+ .. _eLyXer: https://github.com/alexfernandez/elyxer
+
+* docutils/__main__.py,
+ docutils/parsers/commonmark_wrapper.py,
+ docutils/parsers/recommonmark_wrapper.py,
+ docutils/utils/error_reporting.py,
+ docutils/utils/math/__init__.py,
+ docutils/utils/math/latex2mathml.py,
+ docutils/utils/math/tex2mathml_extern.py,
+ docutils/utils/punctuation_chars.py,
+ docutils/utils/smartquotes.py,
+ docutils/writers/html5_polyglot/__init__.py,
+ docutils/writers/html5_polyglot/*.css,
+ docutils/writers/latex2e/docutils.sty,
+ docutils/writers/xetex/__init__.py,
+ test/test_parsers/test_recommonmark/\*.py,
+ test/test_parsers/test_rst/test_directives/test__init__.py,
+ test/test_parsers/test_rst/test_directives/test_code_parsing.py,
+ test/test_parsers/test_rst/test_line_length_limit_default.py,
+ test/test_parsers/test_rst/test_line_length_limit.py,
+ test/test_writers/test_latex2e_misc.py,
+ test/transforms/test_smartquotes.py,
+ tools/docutils-cli.py,
+ tools/rst2html5.py
+
+ Copyright © Günter Milde.
+ Released under the terms of the `BSD 2-Clause License`_
+ (`local copy `__).
+
+* docutils/utils/roman.py
+
+ copyright by Mark Pilgrim, released under the
+ `Python 2.1.1 license`_ (`local copy`__).
+
+ __ licenses/python-2-1-1.txt
+
+* tools/editors/emacs/rst.el
+
+ copyright by Free Software Foundation, Inc.,
+ released under the `GNU General Public License`_ version 3 or later
+ (`local copy`__).
+
+ __ licenses/gpl-3-0.txt
+
+All used licenses are OSI-approved_ and GPL-compatible_.
+
+Plaintext versions of all the linked-to licenses are provided in the
+licenses_ directory.
+
+.. _sandbox: https://docutils.sourceforge.io/sandbox/README.html
+.. _licenses: licenses/
+.. _Python 2.1.1 license: https://docs.python.org/3/license.html
+.. _GNU General Public License: https://www.gnu.org/copyleft/gpl.html
+.. _BSD 2-Clause License: http://opensource.org/licenses/BSD-2-Clause
+.. _BSD 3-Clause License: https://opensource.org/licenses/BSD-3-Clause
+.. _OSI-approved: http://opensource.org/licenses/
+.. _license-list:
+.. _GPL-compatible: https://www.gnu.org/licenses/license-list.html