With regard to suing over patent issues... Sony, Microsoft, Nintendo and Apple probably all infringe on each other's patents all the time, if one of them sued the other, they would get sued in return... though every once in a while it does happen as a matter of routine.
With regard to suing over patent issues... Sony, Microsoft, Nintendo and Apple probably all infringe on each other's patents all the time, if one of them sued the other, they would get sued in return... though every once in a while it does happen as a matter of routine.