Maybe it wasn't a legal copy. Certain people can get hold of cd's and dvd's before they are released and sell them for cheaper. I remember this because my mum did this with a Will Smith album for me because I couldn't wait (many years ago). However everyone just downloads now if they want music before the release date so I'm not sure. Maybe the release dates are different everywhere. Or your sister got very lucky. Where did she but it from?
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