From BIS (Bureau of Industry and Security) website….

GENERAL EXPORT LICENSE FAQS

Does my shipment require an export license? Maybe. A U.S. export license requirement from the Department of Commerce can be triggered by several important factors specific to your transaction: the actual item (commodity, software, or technology) that will be exported, where it is going, who is going to use it, and what they will be using it for. If any of these factors change in your transaction, the license requirements may change.