"Since launching in 2023, SynthID has watermarked over 10 billion images, videos, audio files and texts, helping identify them as AI-generated and reduce the chances of misinformation and misattribution. Outputs generated by Veo 3, Imagen 4 and Lyria 2 will continue to have SynthID watermarks.
Today, we’re launching SynthID Detector, a verification portal to help people identify AI-generated content. Upload a piece of content and the SynthID Detector will identify if either the entire file or just a part of it has SynthID in it.
With all our generative AI models, we aim to unleash human creativity and enable artists and creators to bring their ideas to life faster and more easily than ever before."
From the page linked in the post....
So there's different ways to detect AI generated content (videos/images atleast). (https://www.nature.com/articles/s41586-024-08025-4 <-- paper on synthID / watermarking and detecting it with LLMs)