Are you sure you don't mean licensed? If a company is licensed to do business/operate in another country but not in the U.S. they must get licensed in the U.S. to be able to operated and/ or do business in the U.S. Copyrighting is something different from licencing. Copyrighting protects ownership of something such as works ie. poems, songs or music. If you need more info. call the U.S. Trade mark Office at 1-800-786-9199 or visit their website at www.uspto.gov
They should be able to answer all your questions. Good luck.