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PulseReporter > Blog > Tech > Meta’s Llama has memorized big parts of Harry Potter
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Meta’s Llama has memorized big parts of Harry Potter

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Last updated: June 17, 2025 9:47 pm
Pulse Reporter 3 weeks ago
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Meta’s Llama has memorized big parts of Harry Potter
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Meta’s Llama mannequin has memorized Harry Potter and the Sorcerer’s Stone so effectively that it could possibly reproduce verbatim excerpts from 42 p.c of the e book, in accordance with a new examine.

Researchers from Stanford, Cornell, and West Virginia College analyzed dozens of books from the now-infamous Books3 dataset, a group of pirated books used to coach Meta’s Llama fashions. Books3 can also be on the heart of a copyright infringement lawsuit towards Meta, Kadrey v. Meta Platforms, Inc. The examine’s authors say their findings might have main implications for AI firms going through comparable lawsuits.

In accordance with the analysis paper, the Llama 3.1 mannequin “memorizes some books, like Harry Potter and 1984, virtually solely.” Particularly, the examine discovered that Llama 3.1 has memorized 42 p.c of the primary Harry Potter e book so effectively that it could possibly reproduce verbatim excerpts no less than 50 p.c of the time. Total, Llama 3.1 might reproduce excerpts from 91 p.c of the e book, although not as constantly.

“The extent of verbatim memorization of books from the Books3 dataset is extra vital than beforehand described,” mentioned the paper. However the researchers additionally found that “memorization varies broadly from mannequin to mannequin and from e book to e book inside every mannequin, in addition to various in several components of particular person books.” For instance, the examine estimated that Llama 3.1 solely memorized 0.13 p.c of Sandman Slim by Richard Kadrey, one of many lead plaintiffs within the class motion copyright swimsuit towards Meta.

So, whereas a few of the paper’s findings appear damning, do not name it a smoking gun for plaintiffs in AI copyright infringement circumstances.

Mashable Gentle Pace

“These outcomes give everybody within the AI copyright debate one thing to latch on to,” wrote journalist Timothy B. Lee in his Understanding AI e-newsletter. “Divergent outcomes like these might solid doubt on whether or not it is smart to lump J.Okay. Rowling, Richard Kadrey, and hundreds of different authors collectively in a single mass lawsuit. And that would work in Meta’s favor, since most authors lack the assets to file particular person lawsuits.”

Why is Llama in a position to reproduce some books greater than others? “I think that the distinction is as a result of Harry Potter is a way more well-known e book. It is broadly quoted and I am positive that substantial excerpts from it on third-party web sites discovered their approach into the coaching knowledge on the internet,” mentioned James Grimmelmann, a professor of digital and knowledge legislation at Cornell College, who was cited within the paper.

What this additionally reveals, Grimmelmann mentioned, is that “AI firms could make selections that enhance or scale back memorization. It is not an inevitable function of AI; they’ve management over it.”

Meta and different AI firms have argued that utilizing copyrighted works to coach their fashions is protected underneath honest use, a fancy authorized doctrine. Nevertheless, the extent of memorization might complicate these arguments.

“Sure, I do suppose that the probability that LLMs are memorizing greater than beforehand thought modifications the copyright evaluation,” Robert Brauneis, a professor with the George Washington College Regulation College, mentioned in an electronic mail to Mashable. He concluded that the examine’s findings might finally weaken Meta’s honest use argument.

We requested Meta for touch upon the examine’s findings, and we’ll replace this text if we obtain a response.


Disclosure: Ziff Davis, Mashable’s mum or dad firm, in April filed a lawsuit towards OpenAI, alleging it infringed Ziff Davis copyrights in coaching and working its AI techniques.

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Synthetic Intelligence
Meta

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