Study: Meta AI model can reproduce almost half of Harry Potter book

https://arstechnica.com/features/2025/06/study-metas-llama-3-1-can-recall-42-percent-of-the-first-harry-potter-book/


In recent years, numerous plaintiffs--including publishers
of books, newspapers, computer code, and photographs--have
sued AI companies for training models using copyrighted
material. A key question in all of these lawsuits has been
how easily AI models produce verbatim excerpts from the
plaintiffs' copyrighted content.

...
...

These results give everyone in the AI copyright debate
something to latch onto. For AI industry critics, the big
takeaway is that--at least for some models and some
books--memorization is not a fringe phenomenon.

On the other hand, the study only found significant
memorization of a few popular books. For example, the
researchers found that Llama 3.1 70B only memorized 0.13
percent of Sandman Slim, a 2009 novel by author Richard
Kadrey. That's a tiny fraction of the 42 percent figure for
Harry Potter.

and of course some wag immediately asked if Meta AI can quote the
end of "A Song of Ice and Fire"...
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