Quote:
Originally Posted by conan50
Pottermore is using a non-DRM, common sense solution that would stop piracy and yet gives readers the ability to actually own their books and use the ebooks wherever they want--on any Epub capable device.
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Pottermore use watermarking, which is a form of DRM. Digital Rights Management can take many forms. Encryption is one, watermarking is another; there are others as well.