Deepfakes, those computer-generated videos of well-known people saying things they never actually said, strike a lot of experts as terrifying. If we can’t even trust videos we see online, how does democracy stand a chance?

As photo- and video-manipulation apps get cheaper and better, the rise of fake Obamas, Trumps, and Ukrainian presidents seemed unstoppable. But then a coalition of 750 camera, software, news, and social-media companies got together to embrace an ingenious way to shut the deepfakers down—not by detecting when videos are fake, but by offering proof that they’re real.

Guests: Dana Rao, chief counsel and executive vice president of Adobe.

Eric Horvitz, chief scientific officer, Microsoft.

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