Original Markdown code is under a BSD-style license, as described on http://www.michelf.com/projects/php-markdown/license/
Copyright (c) 2004 John Gruber http://daringfireball.net/projects/markdown/
Copyright (c) 2004 Michel Fortin - PHP Port http://www.michelf.com/projects/php-markdown/
The library uses http://www.michelf.com/projects/php-markdown/extra/ extended Markdown Syntax.
Be aware, that the whole Markdown system is procedural with a bunch of global variables. I take no responsibilities for the quality of that piece of code. In my eyes it could need some decent refactoring.
To allow for easier extension at later times, a wrapper class (net_nehmer_markdown_markdown.php) has already been created.
Nothing fancy, loads the markdown library.