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It does sound like you've got a device that's exceeded it's number of autherisations. YOu could try asking the seller to de-register it. But it might be easier to contact sony or adobe, and explain the issue to them. They may be able to clear it for you.
Yes you need to have sony library on your pc. But don't use it because it's horrible. The adobe works fine. Or Calibre - available on MR.
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