Credit to the U.S. Food and Drug Administration as the source is appreciated but not required. People are also free to link to any URL on FDA's site. A person copying documents to another Website, instead of linking to them, would then have to monitor the original documents to know when these documents were updated by FDA or else risk giving bad or incorrect advice to visitors to their Website. If a person, nonetheless, decides to copy content or images, FDA strongly recommends that the copied item lists the date that the material was copied and provides a link back to its source on the FDA Website.
Users can then see for themselves if the copied material has been updated or changed.
FDA appreciates being informed about the use of Website materials.