Apple has Won a Patent for the Possible use of Palm ID Biometrics for Apple Watch
Apple's engineering teams have been working on delivering a biometrics solution for Apple Watch for some time with emphasis on a Touch ID button or surface ( 01 and 02). In today's granted patent we see that one of Apple's engineering teams has invented an alternative biometrics system that will use the user's hand in the form of Palm ID. An Apple Watch (iPhone and/or iPad) will use both a dot projector and a palm biometric sensor to achieve a Palm ID reading.
Source: patentlyapple.com
