Abstract: A system, method, and computer product, the system comprising: a transmitter configured to transmit a multiplicity of commands related to managing usage of a screen in accordance with one or more rules, the multiplicity of commands sent at intervals during an applicability time period of a rule; and a receiver operatively connected to the screen, the receiver configured to receive the commands from the transmitter and apply the commands to the screen, thereby managing usage of the screen for the applicability time period of the rule, wherein the transmitter and the receiver communicate with each other using authenticated communication.