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This is a known issue with ADE and eReaders, though the cause is not known. Users will need to deactivate both their device and their computer, then follow these instructions:
Please email the library if you have any other questions.
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If you attempt to read an e-pub book on multiple devices you will receive this message: "E_LIC_ALREADY_FULFILLED_BY_ANOTHER_USER." Users get this error if they are attempting to read their ePub book on multiple devices. If each device has a different ID, you will need to un-authorize and authorize them so they all match. It is easiest to un-authorize Adobe Digital Editions on your computer. To do this:
This issue deals with date and time. Make sure that the machine’s system time, date, and time zone match the time / date / zone when you purchased the PDF or ePUB. Please email the library if you have any other questions.