Extension to protect access to files based on which pages images are embedded and the SMW properties assigned to that page.
Please check http://www.mediawiki.org/wiki/Manual:Image_Authorization for proper setup first.
$SMWFileProtectRights = array("sysop"); // Which roles are always allowed to view files no matter the linked pages
$SMWFileProtectReferUsers = array("Has User"); // Property that refers to pages that link to other pages, for instance user pages, assuming that a page is created or assigned to a user
$SMWFileProtectReferProps = array("Is Visible"); // Boolean property that can be used to grant permission to the page.
$SMWFileProtectReferNS = true; // This allows to block viewing based on Lockdown Extension https://www.mediawiki.org/wiki/Extension:Lockdown