(a) Within the meaning of this part, informational materials shall be deemed labeled whenever they have been marked or stamped conspicuously at their beginning with a statement setting forth such information as is required under section 4(b) of the Act.

(b) Informational materials which are required to be labeled under section 4(b) of the Act and which are in the form of prints shall be marked or stamped conspicuously at the beginning of such materials with a statement in the language or languages used therein, setting forth such information as is required under section 4(b) of the Act.

(c) Informational materials required to be labeled under section 4(b) of the Act but which are not in the form of prints shall be accompanied by a statement setting forth such information as is required under section 4(b) of the Act.

(d) Informational materials that are televised or broadcast, or which are caused to be televised or broadcast, by an agent of a foreign principal, shall be introduced by a statement which is reasonably adapted to convey to the viewers or listeners thereof such information as is required under section 4(b) of the Act.

(e) An agent of a foreign principal who transmits or causes to be transmitted in the U.S. mails or by any means or instrumentality of interstate or foreign commerce a still or motion picture film which contains informational materials shall insert at the beginning of such film a statement which is reasonably adapted to convey to the viewers thereof such information as is required under section 4(b) of the Act.

(f) For the purpose of section 4(e) of the Act, the statement that must preface or accompany informational materials or a request for information shall be in writing.