pathetic ... just talked to Sony support, and they gave me the same line, 2+ yrs after this bug was first reported.
http://www.kb.sony.com/selfservice/d...nalId=C1008686
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A Protected Page! error occurs on the Reader when opening a borrowed book that is in the ePub or PDF format.
Solution
This may happen when borrowed Adobe DRM-protected ePub and PDF eBooks exist on the Reader at the same time. Follow this procedure to correct this issue:
1. Delete all borrowed books from the Reader.
2. Verify that all borrowed books are in the same format (either ePub or PDF) before transferring them back to the Reader.