What you have are eReader books. They cannot be read on the Sony without removing the DRM. I'm afraid that even if you had bought ePub books from B&N, you still wouldn't be able to read them on your Sony; B&N are using their own DRM mechanism for ePub which nobody else currently supports.
I suggest you treat it as a "learning experience", and avoid B&N in the future, at least as far as buying books for your Sony is concerned.
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