Google devises new watermark for AI-made text

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SynthID previously watermarked images and audio. Now it can do the same for text and video.

Google Tuesday unveiled a new technique for marking text so it can later be identified as AI-generated without altering the quality or meaning of the writing.The new features for Google's existing watermarking tool, called SynthID — which until now has only handled images and audio — will automatically watermark text generated by Google's Gemini AI programs in the Gemini app or on the web.

For images, Google designed the watermark to remain detectable even after they were modified by adding filters, changing colors or adjusting brightness. And unlike visible watermarks, SynthID can't be removed by cropping.Large language models for text generation work by producing sequences of text in response to prompts.

The phrases, words and characters are called "tokens" and each token is given a probability score. "The final pattern of scores for both the model's word choices combined with the adjusted probability scores are considered the watermark," Google says.

 

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