The US Patent and Trademark Office (USPTO) issued an official warning reminding US companies that patent prosecution occurring abroad for US inventions could violate US export control regulations. The notice clarified that a USPTO-issued foreign filing license does not provide a license to generally export US technology abroad. Without an export license, a US company’s transmission of controlled data for purposes of obtaining a foreign patent, including transfer within the company, may violate regulations if the transfer occurs prior to the issuance of a foreign filing license or the data exceeds the scope of the license. Export control regulations do not require licenses for publicly available data, including data published in patent applications.