Having a protected ebook usually means the reader is not authorised to view the ebook so here is a few things to check.
Do you have Adobe DE installed and is your computer and reader authorised ?
If you downloaded the ebook with the Sony software when you go to the Help menu in the Sony software and choose About Reader library does it say this computer is authorised for Adobe content?
As I have said in another thread you should use Adobe DE to download all ebooks except Sony ebooks which you use the Sony software for.
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