I'm still a little befuddled by the music rights offered by Itunes. What does it mean that I can only share music with 4 other computers? (Does this mean 4 computers concurrently on a network or something else? I'm essentially confused about how the number of computers is tracked.) Also, is it true that if you make a quicktime movie using music purchased off of Itunes, other computers playing the quicktime movie can't hear the music? Thanks!!