The Download: protecting photos from AI, and air-conditioning's dilemma

There's currently nothing stopping someone taking the selfie you posted online last week and editing it using powerful generative AI systems. Even worse, it might be impossible to prove that the resulting image is fake. The good news is that a new tool, created by researchers at MIT, could prevent this. The tool, called PhotoGuard, works like a protective shield by altering photos in tiny ways that are invisible to the human eye but prevent them from being manipulated. If someone tries to use an editing app based on a generative AI model to manipulate an image that has been "immunized" by PhotoGuard, the result will look unrealistic or warped.