When OpenAI released its AI video-generation app, Sora, in September, it promised that “you are in control of your likeness end-to-end.” The app allows users to include themselves and their friends in videos through a feature called “cameos”—the app scans a user’s face and performs a liveness check, providing data to generate a video of the user and to authenticate their consent for friends to use their likeness on the app. But Reality Defender, a company specializing in identifying deepfakes,