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Two years ago, a multipart Times investigation highlighted an epidemic of child sexual abuse material which relied on platforms run by the world\u2019s largest technology companies.\n\nLast week, Apple revealed its solution \u2014 a suite of tools which includes an update to the iPhone\u2019s operating system that allows for the scanning of photographs.\n\nThat solution, however, has ignited a firestorm over privacy in Silicon Valley.\n\nGuest: Jack Nicas, a technology reporter for The New York Times.