This will always be spoofable by projecting the AI content onto the sensor and playing it to the microphone. Which will give the spurious content a veneer of authenticity, this is within reach of a talented malicious amateur, and would be trivial for nationa-state actors to do at scale.
Thank you for pointing that out, I want to reply to everyone here but I don't think I have it in me to fight this battle. It seems my initial message of "have we questioned ourselves what we'll do should the countermeasures fail?" fell on deaf ears. I asked a very simple question: "what will we do / should we do when faced with a world in which no content can be trusted as true", and most replies just went on to list the countermeasures being worked on. I will follow my own advice and simply accept that is how the band plays.
Of course. I don’t think anyone is going to be arguing that content captured by these cameras is real, it’s that the content is captured by the owner of that specific camera. There always needs to be some aspect of trust, and the value comes in connecting that with a trusted identity. Eg one couldn’t embed the CSPAN watermarks from a non-CSPAN camera.