The provisions of this Article shall not apply to sheriffs, constables or other public or court officers, or to any other person or persons acting under the license, direction or authority of any court, State or federal, selling goods, wares or merchandise in the course of their official duties; provided, however, that no newspaper publisher, radio-broadcast licensee, television-broadcast licensee, or other agency or medium for the dissemination of advertising shall be liable under this Article by reason of the dissemination of any false? advertisement prohibited by this Article, unless he has refused, on the written request of any law-enforcement officer or agency of this State, to furnish to such officer or agency the name and address of the person who caused the dissemination of such advertisement. (1957, c. 1058, s. 7.)