Each individual device is treated differently by the encryption. So that you canNOT move a copy of a book from, say, one pc to another pc. Each needs to download it from your archive. Obviously, the ones you've been able to transfer do not have drm.
The only bypass, questionable behavior, would be to remove the drm so that it can be read on another device. Now whether removing drm is an ethical issue for you, it might be for your employer whose computer you would be installing the book on????
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