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Ploppy, you said "What would stop people from sharing their ebook password with their 50 billion Faceache friends? Surely to make it secure you would need to incorporate some form of DNA testing as well as fingerprint/password. " along with some more reductio ad adsurdum.
Biometric authentication is ideally device dependent. My prints are associated with my laptop. They have zero value to 50 billion Facebook users. My laptop is safe from them, lol, as would be my e-reader that happened to use biometric authentication.
Perhaps you missed the point that biometrics is a convenience technique and an alternative, not a replacement, for passwords? When authentication is more convenient it becomes less onerous to apply DRM, for example whenever you power up your e-reader. We can continue to argue the merit of DRM itself. I don't like it but I'd rather have a biometric entry into my DRM material than not have one.
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