Hi,
I noticed this on the Edit page on mediawiki.org:
* Pages in the Help: namespace all have a thick blue border around them, indicating that their content is released into the public domain. Do not make edits to these pages unless you are comfortable releasing your contributions under this license.
There are far too many misconceptions about copyright and public domain in circulation already, MediaWiki shouldn't spread them even further. Public domain is not a license. Please correct this as soon as possible.
Timwi