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As the two other comments noted, that most ADE-books are licenced to individuals with the option of having the books on more than one device or migrate to new devices. The books are assigned to you through your Adobe ID.
(This is the more common approach for DRM-restrictions, but there are others Nintendo for instance licences downloaded games on a per unit basis, with the unfortunate side-effect that if you break your console you need to have it repaired rather than just buying a new console and buying a new Wii or 3DS will be less desirable if this remains unresolved)
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