Is there a chance that some of the protected books were downloaded initially via an ADE install that had NOT been registered? ADE can authorize books in two distinct modes.
If you do the initial download of a book to a copy of ADE that has not been registered, then a machine specific ADE ID is created, and that material is not accessible to other machines.
If on the other hand, you have registered ADE before the download, then that same material can be accessed on any other install of ADE associated with the same account.
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