a certificate of approval again issued under
section 15.
(4) No person shall in relation to the exhibition of
any film, or a copy thereof, publish or display any
advertising material in respect of which a certificate of
approval issued under section 20 has been revoked unless
and until there is in force in respect of the advertising
material -
(a) a certificate of exemption issued under section
21; or
(b)
a certificate of approval again issued under
section 20.
(5)
No person shall in relation to the exhibition of
any film, or a copy thereof, publish or display any
advertising material in respect of which a certificate
exemption issued under section 21 has been revoked unless
and until there is in force in respect of the advertising
material