When a person publishes in a newspaper or other printed paper published or circulated in Kenya, or supplies for publication, a message for the right to publish which payment or equivalent consideration has been given and which has been transmitted by telegraph from a place within or outside Kenya and lawfully received by him, no other person shall, without the written consent of the first-mentioned person or his agent thereto lawfully authorized, print or publish, or cause to be printed or published, that message or the substance thereof or any extract therefrom until a period of eighty-four hours has elapsed from the time of first publication; and the publication of the whole or any part of that message or the substance thereof shall be deemed to be a publication of it.