tinyroxygen as a whole is distributed under the Apache License 2.0 (see
LICENSE.txt).

It bundles a trimmed-down, vendored copy of the CommonMark reference
implementation 'cmark' (https://github.com/commonmark/cmark), used to
implement Markdown support (@md tag) for Rd generation. Only the
core CommonMark parser and node-tree/AST files are included (no HTML/XML/
LaTeX/man renderers, no GFM extensions, no command-line tool); see
src/cmark/ and scripts/cmark.sh for exactly what is vendored and how to
re-vendor it.

cmark is Copyright (c) 2014, John MacFarlane, distributed under the
2-clause BSD license. Parts of it (houdini.h, houdini_href_e.c,
houdini_html_e.c, houdini_html_u.c) derive from
https://github.com/vmg/houdini, Copyright (C) 2012 Vicent Martí,
distributed under the MIT license. The full upstream license text is
vendored unmodified at src/cmark/COPYING.

src/cmark/cmark_export.h and src/cmark/cmark_version.h are not upstream
cmark files - they stand in for headers cmark's CMake build normally
generates. They are regenerated automatically by scripts/cmark.sh on
every re-vendor (see that script).
