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Hmmm... looks suspiciously like a DRM issue.. if you purchase the book to read on your mac then it may not work when transferred to your device... but I am not familiar with the mac and would need a lot more info to be sure.. most times drm protected books will only open on the device used to buy them which by default becomes the "authorized device" that is the whole point of drm and is what makes it a real PITA
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