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Google Researchers’ Attack Prompts ChatGPT to Reveal Its Training Data
(www.404media.co)
This is a most excellent place for technology news and articles.
"Copyrighten" is an interesting grammatical construction that I've never seen before. I'd assume it would come from a second language speaker.
It looks like a mix of "written" and "righted".
"Copywritten" isn't a word I've ever heard, but it would be a past tense form of "copywriting", which is usually about writing text for advertisements. It's a pretty niche concept.
"Copyrighted" is the typical form for works that have copyright.
I'm not a grammar nazi - what's right & wrong is about what gets used which is why I talk about the "usual" form and not the "correct" form - but "copyrighted" is the clearest way to express that idea.
Copyrighten is just how they say it out in the country.
"I dun been copyrighten all damn day"
"Copyrightened" could mean explicit consent to use your material.