In order to protect a page from vandalism and other kinds of undesirable edits, the MediaWiki software provides two possible remedies (apart from page reversion, after the fact):
- Protection: Limiting editing of a page to administrators only.
- Semi-protection: Limiting editing of a page to registered users only.
The exact policies under which page protection status can or should be changed (actions which can only be performed by administrators) have not been worked out yet.
See Wikipedia's page protection policy and semi-protection policy for how they do things.