Bought a couple of songs on my iPad, and when I plugged it into my Mac, iTunes popped up asking me to authorise my computer to play the songs or something? Not sure. Either way, it came up I can use the songs on up to 5 computers. I think that's what it said anyway. What's the deal? I thought iTunes was DRM-free now? So does that mean, if I put the songs on my Windows machines, and eventually future computers, after another 5 times, I won't be able to play the songs any more? I'm pretty sure that doesn't happen with songs I've purchased on my Mac.