Don't use this module.
Markdown Extra merged into Markdown.
- Original Backdrop port of Markdown by Chris Herberte (https://github.com/chrisherberte)
- Markdown created by John Gruber (http://daringfireball.net)
- PHP executions by Michel Fortin (http://www.michelf.com/)
- Drupal Markdown filter originally by justin2pin (https://www.drupal.org/project/markdown)
- Ported to Backdrop by David Norman (https://github.com/deekayen)
The Backdrop module code is GPL v2 software, but the php-markdown
library is distributed under separate copyright held by Michel Fortin.