If the Copyright Act, 1911, so far as in force in the law of Nigeria or any part thereof is repealed or amended by that law at a time when sub-paragraph (2) of paragraph 39 of the Seventh Schedule to the Copyright Act, 1956 (which applies certain provisions of that Act in relation to countries to which the said Act of 1911 extended) is in force in relation to Nigeria or that part thereof, the said sub-paragraph (2) shall thereupon cease to have effect in relation thereto.