public function getSecureURL($expires = 60) {
		if($this->owner instanceof \Image_Cached || $this->owner instanceof \CdnImage_Cached) {
			return;
		}

		/** @var \FileContent $pointer */
		$pointer = $this->owner->obj('CDNFile');

		if($pointer->exists()) {
			$reader = $this->reader();
			if ($reader && $this->owner->canView() && method_exists($reader, 'getSecureURL')) {
				return $reader->getSecureURL($expires);
			}
		}
	}