I just bought 30 music from iTunes. There are 3 which I cannot play on my windows computer, even after I authorised my computer again and again. The others I have no problem playing whatsoever. This is why people hated most about Digital Rights Management (DRM) where legitimate buyer is treated like potential thief and sometimes got locked out of his own purchase. Incidentally, the song I want to play is titled “You so evil” in Mandarin.