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That might be useful information.
Make a BUNCH of back-up copies, maybe place an encrypted version or two (via hashed OP_RETURN) on the blockchain.
These two sites can do just that relatively cheaply and relatively easily! They would be tamper-proof too. Might want to use a pseudonym (false name) as author, "just in case".
bitproof.ioand
proofofexistence.comWOW, Thank you for this kind of tip, Much appreciated! But i dont know why i need to Notarize my .pdf ebook.
Can you tell how that works and Why i need to do it ?
What do you mean by protect files? Protect file from hacker ?