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Maintaining ebook copyright - why encryption is not enough to protect your ebooks

I can upload an e-book online and ensure that only people who pay for the book can download it, but this does not stop anyone from making copies and distributing it freely. A common work around this problem is to password protect the e-book. So after a customer pays for the book and downloads it, he then receives a mail with the password to open the e-book he has just downloaded. Unfortunately that is no protection at all; the user who has just downloaded the file can actually copy the file and attach the password with each copy he makes. So in essence password protecting a file is no good.

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