HERE's a way to shake off anonymity – literally. Footage from wearable cameras contains a "motion signature" unique to you. The discovery could identify police wearing body cameras, but also let authorities single out protesters uploading footage, say. Shmuel Peleg and Yedid Hoshen at Israel's Hebrew University of Jerusalem collected footage from 34 people who wore GoPro cameras on baseball caps. They ran it through an algorithm that recognized motion signatures particular to each person.
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