I'm surprised by how few people on HN feel contracts have a moral obligation aspect to them, but once you believe there is no morality in a legal contract, then a whole lot of things become permissible, specifically related to pirating and other kinds of legal trespasses.
Do you believe in individual responsibility, then? That is, if I, your friend, promise to give you a ride to the store and then don't follow through, am I morally culpable?