When a bank does not want to accept a foul bill of lading, the shipper (so that there shall be nothing to prevent that draft in question from being discounted or for any other reason) may obtain a clean bill of lading. To accomplish that, a shipper signs a letter of indemnity on the basis of which a clean bill of lading may be obtained, even though the dock receipt indicates that the shipment was damaged or in less than good condition.