If you bought ebooks from the Sony store then you can share books for the most part. The Sony will only work with Sony store books that were bought from the account that the books were bought from.
Are the PDFs DRM free? If so, then yes those could be shared. If not, then once again, no... unless the readers are authorized to the same Adobe ID.
Hope that helps, you really didn't give much info as to where you got the books, what format they were, if they had DRM etc.
BOb
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