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China announces plan to label all AI-generated content with watermarks and metadata.
(english.news.cn)
This is a most excellent place for technology news and articles.
Stable Diffusion has the option to include an invisible watermark. I saw this in the settings when I was running it locally. It does something like adds a pattern that is easy to detect with machines but impossible to see. The idea was that you could check an image for it before putting it into training sets. Because I never needed to lie about things I generated I left it on.