In the world of shipping, delivered duty unpaid (DDU) simply means that it's the customer's responsibility to pay for any of the destination country's customs charges, duties, or taxes. These must all be paid in order for customs to release the shipment after it arrives. On the other hand, delivered duty paid (DDP) means it's the shipper's responsibility to pay any of the customs charges, duties, and/or taxes required to send the product to the destination country.