The Laws of Robotics were a set of guidelines followed by the Servobots on the human colony planet of Podworld. There were originally three Laws of Robotics, which the Tenth Doctor was familiar with, before the addition of a fourth making The Laws of Robotics V2.0.
The first Law of Robotics stated "A robot may not injure a human being."
The second law stated "A robot must obey orders given to it by human beings."
The third stated "A robot must protect its own existence."
The fourth stated "A robot may pass their service duties on to a lower rated Servobot, as long as the above laws are met." (COMIC: Glum Culture)