31 C.F.R. § 560.205
(a) Except as otherwise authorized pursuant to this part, and notwithstanding any contract entered into or any license or permit granted prior to May 7, 1995, the reexportation from a third country, directly or indirectly, by a person other than a United States person, of any goods, technology, or services that have been exported from the United States is prohibited, if:
(b) The prohibitions of paragraph (a) of this section shall not apply to those goods or that technology subject to export license application requirements if such goods or technology have been:
Note to § 560.205(b): The reexportation of U.S.-origin goods or technology, including U.S.-origin goods or technology that have been incorporated or substantially transformed into a foreign-made product, not prohibited by this section, may require authorization by the U.S. Department of Commerce under the Export Administration Regulations (15 CFR parts 730-774) or by the U.S. State Department under the International Traffic in Arms Regulations (22 CFR 123.9).