"Oh, and sichan, the difference is that DirecTV owns the content of that signal. Its illegal the same way stealing cable is illegal, it doesnt matter that its being sent from a satellite. "
Although DirectTV owns the content of that signal, they are transmitting it through your house whether you subscribed to them or not. Therefore, it is not illegal to intercept that signal. It is illegal, however, to hack the DirectTV cards/boxes - which you merely rent, but never own - in order to decode the signals.