The Four Laws of Robotics
The Three Laws of Robotics:
First Law: A robot may not injure a human being or, through inaction, allow a human being to come to harm.
Second Law: A robot must obey orders given it by human beings except where such orders would conflict with the First Law.
Third Law: A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.
Zeroth Law (Later Addition)
A robot may not harm humanity, or, by inaction, allow humanity to come to harm.