Adobe allows 6 registrations (PC's & other devices) under a single Adobe ID. Things authorized under the same ID can read the same DRM'd material. You can also de-authorize devices/PC's. Also according to the ADE FAQ on Adobe's site you can contact Customer Service to increase your allowable activations.
Your books are tied to your Adobe ID.
If you install a different OS you'd need to install ADE and then authorize it to read your books.
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