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OpenAI has built a text watermarking method to detect chatgpt written content
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
Not to mention that it would be extremely difficult to implement an effective watermark on text below a certain size
There are hundreds of thousands of pixels in an image where you can hide a watermark, but in a text output of a paragraph or less there are only a couple hundred characters.
How precise is the watermark? Is it a specific sequence of characters? Is it a sequence of words? A number of characters in a row? Non-print characters?
How precise the watermark is will determine how easy it is to get around. I imagine some of the most important uses to detect would be twitter/social media influence bots where the output length is only 140 characters or less. I find it hard to imagine a watermark on output of that size being effective or reliable.