Allows you to designate some areas within a textarea to be protected from interference by WYSIWYG editors.
This could theoretically be used to prevent users from messing up carefully constructed layouts.
It provides a new WYSIWYG button "Lock" which allows editors to click on given divs or paragraphs and lock or unlock them.
But really it's just an experiment and demo module for a small WYSIWYG_API + CKEditor plugin.
This will probably never be any more than a sandbox - unless someone can think of a use for it.