According to Webcontent.gov, the U.S. Federal Government’s site for official web publishing guidance, “…when an organization uses or duplicates information available from the private sector as part of an information resource, product, or service, the organization must ensure that the property rights of the private sector source are adequately protected. These protections apply to any material posted to federal public websites, such as documents, graphics, or audio files.”
Photo credits in U.S. Mission websites are required in the ALT tag of the photograph. For example: “Man standing at podium (State Dept.)” or “Audience Members (AP Photos)”. It is strongly recommended that any photo over 200 x 200 pixels contain a photo credit embedded with the image.
NOTE: ONLY PHOTOGRAPHS MUST HAVE CREDIT INFORMATION. LOGOS, DRAWINGS, OR OTHER GRAPHICS DO NOT REQUIRE USE OF A PHOTO CREDIT.