You were ok up to this point:
Quote:
Originally Posted by llasram
If your system allows one to read a book on any device just by providing your public key and the protected book.
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Substitute "private" for "public" and you've got it. And of course, no pirate is going to have my private key, unless I am the pirate, and that brings us round full circle to the fact that nothing will stop a determined pirate, and that at some point any system has to produce plaintext, or else we couldn't read books.