There's no license required if the total of the parts shipment is under $100. There is a reporting requirement that's required with US Customs and Border Patrol/Census so sellers that aren't registered in the system and reporting NLR, (No License Required), shipments are in violation of ITAR, (International Traffic in Arms Regulations), and can be prosecuted if they get caught. If the shipment is over $100 in value, an export license is required via a registrant with PMDTC, US Dept. of State. The yearly registration is very expensive and that's why the process is quite expensive if you hire an exporter to do it correctly.