public function read( &$download ) {
		global $wpdb;

		if ( ! $download->get_id() ) {
			throw new Exception( __( 'Invalid download.', 'woocommerce' ) );
		}

		$download->set_defaults();
		$raw_download = $wpdb->get_row(
			$wpdb->prepare(
				"SELECT * FROM {$wpdb->prefix}woocommerce_downloadable_product_permissions WHERE permission_id = %d",
				$download->get_id()
			)
		);

		if ( ! $raw_download ) {
			throw new Exception( __( 'Invalid download.', 'woocommerce' ) );
		}

		$download->set_props(
			array(
				'download_id'         => $raw_download->download_id,
				'product_id'          => $raw_download->product_id,
				'user_id'             => $raw_download->user_id,
				'user_email'          => $raw_download->user_email,
				'order_id'            => $raw_download->order_id,
				'order_key'           => $raw_download->order_key,
				'downloads_remaining' => $raw_download->downloads_remaining,
				'access_granted'      => strtotime( $raw_download->access_granted ),
				'download_count'      => $raw_download->download_count,
				'access_expires'      => is_null( $raw_download->access_expires ) ? null : strtotime( $raw_download->access_expires ),
			)
		);
		$download->set_object_read( true );
	}