Facebook is both embroiled in privacy struggles over its use of facial recognition, working to spread it far and wide, and coming up with ways to flummox the technology so it can’t match an image of a person to one stored in image databases. On Sunday, Facebook Research published a paper proposing a method for using a machine learning system for de-identification of individuals in videos by subtly distorting face images so they’re still recognizable to humans, but not to machines.

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