Finally, there’s the security aspect. Microsoft’s Lumia 950 smartphone attempted to use a camera as a biometric interface, which would recognize the unique pattern of a user's iris, but it doesn’t really work that well.
The patent is all very much a mountain of circumstantial evidence, of course. But Microsoft may be envisioning a day when future Surface phones or tablets ship with an optional keyboard equipped with a pointing device that also serves as biometric authentication.
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