Thank you for admitting that. And just to make sure it's clear, I'm not attacking anyone, I'm just arguing the point.
You own the right to have the song on 5 computers. If you own six computers at home and really want access to the song on all six computers, then I guess you could burn the downloaded song on a CD, put it in the CD drive of the other computer, and import it. (If you have 6 computers at home, I don't think buying blank CDs would be a problem!

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I highly doubt there's any law anywhere saying other people can't hear the music you have, assuming you mean friends just listening while they're at your place and not some sort of public event you've organized. It's giving people illegal copies of that music which is the main problem.
I agree, you shouldn't be able to make unlimited copies of CDs, but that's the nature of the technology.
Compare CDs to books--right or wrong, you can make zillions of copies of a paper book. With a computer, you can scan the book in and distribute zillions of copies, just like you can import a CD and distribute zillions of copies.
E-books, like AAC files, are generally copy-protected, preventing you from making tons of copies. I admit I am not familiar with the details of E-books licenses and have never bought an E-book, but I think the analogy is more or less valid.
Just because you *can* make unlimited copies of a book or an album on a certain medium doesn't mean it's legal or "right" to do.
Which license are you talking about? I agreed to one that only allows me to have the song on 5 different computers. Well, technically, I first agreed to a license allowing me to have my song on only 3 computers. For no additional charge, the 300+ songs I had already downloaded from the iTunes music store before I installed iTunes 4.5 now can be put on 5 computers.
I guess you have a point here. I can't come up with a valid argument, other than the fact that they're the ones that own the rights, so they can decide what they want to and what they don't want to do.