Wikimedia Extension "Extended Whitelist"
This extension allows to whitelist pages by category.
The intention is to use this extension with closed Wikis (like this one here) but still be able to share certain pages just by putting them into pre-defined categories.
Written by WS64 and only tested with Wikimedia 1.19!
require_once( "$IP/extensions/ExtendedWhitelist/ExtendedWhitelist.php" );
Add lines to LocalSettings.php like this one:
$WSCategoryWhitelist = array( "PUBLIC","public" );
This example will whitelist all files that are within the categories "PUBLIC" and "public".