The PDF versions of O'Reilly's ebooks have your name embedded on each page to discourage people from making them available to other people. That's probably why most of the O'Reilly books you see on the darknets are scanned books rather than copied ebooks (note, I haven't checked myself, just going by what a previous poster says). I do have a number of O'Reilly books, so I really can't imagine someone putting such a PDF up for everyone to access.
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