Google's SynthID is the latest tool for catching AI-made content. What is AI 'watermarking' and does it work?

Note: only the third panel from the original image has been used here. Last month, Google announced SynthID Detector, a new tool to detect AI-generated content. Google claims it can identify AI-generated content in text, image, video or audio. But there are some caveats. One of them is that the tool is currently only available to "early testers" through a waitlist.