	static public function getInstanceOf($_usernfo, $_tid) {
		if (!isset(self::$tickets[$_tid])) {
			self::$tickets[$_tid] = new ticket($_usernfo, $_tid);
		}
		return self::$tickets[$_tid];
	}
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.