Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the filemusthave an additionalcopyright tagindicating the copyright status in the source country. Note:This tag shouldnotbe used for sound recordings.PD-1923Public domainin the United States//commons.wikimedia.org/wiki/File:Signature_of_John_Stewart_Kennedy.png