I understand that Fairplay DRM is imposed on songs downloaded from the iTunes Music Store in order to limit piracy. Fair enough, but this leads me to wonder exactly what restrictions are imposed, and how they might affect me. If I replace my Mac, can I transfer all of my songs to my new Mac? If I replace my Mac five times in the next ten years, will I still be able to have my songs on my newest machine, or will the DRM tell me that the songs have been played/installed on too many different machines? Will my music still work if my Mac dies and I have to restore a backup? What happens when I replace my iPod? I'm the sort of person who buys music now, and listens to it for years and years into the future, so I'm really anxious to get some reassurance that I won't end up having to buy all of my iTMS content all over again in a few years' time because of the limitations imposed by the DRM.