Quote:
Originally Posted by ksng
Does anyone know what's the best way to protect ePUB files? which means we want to make sure the book cannot be transfered to another user? is it possible?
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This is what DRM is designed to do. It encrypts the ebook, which prevents "casual" sharing - but it is technically impossible to design an encryption scheme that is secure against the person you are sending the encrypted file to. Since this is exactly what ebook DRM does, almost all the available schemes have been circumvented and the remaining ones can be circumvented if someone with the right skills tries hard enough.
There are three DRM schemes for ePub with widespread reader apps. Adobe ePub is the most popular. B&N ePub is a username/password based scheme, which is also supported by Adobe but is not on most ebook Readers. Apple ePub has not been circumvented, but is only available on iTunes for iThing apps. Adobe and B&N DRM have both been circumvented, so in practice they are worthless.
None of these is readily available for individuals or small publishers to encrypt their ebooks. You can post ebooks to some ebook distributers and have them add DRM, or buy a service from Adobe - but it is expensive. It would not be hard for someone to reverse engineer B&N ePub creation, but there is no real incentive to do so.