 Thus, the USPS holds copyright to such materials released since 1978 under Title 17 of the United States Code.Written permission is required for use of copyrighted postage stamp images, although under USPS rules, permission is "generally" not required for "educational use", "news reporting" or "philatelic advertising use," but users must cite USPS as the source of the image and include language such as "© United States Postal Service.All rights reserved."