public domain- No person may, except with the written permission of the Director, knowingly use the words ‘Central Intelligence Agency’, the initials ‘CIA’, the seal of the Central Intelligence Agency, or any colorable imitation of such words, initials, or seal in connection with any merchandise, impersonation, solicitation, or commercial activity in a manner reasonably calculated to convey the impression that such use is approved, endorsed, or authorized by the Central Intelligence Agency.