Almost exactly a year ago, a group of authors filed suit against AI company Anthropic over its creation of an enormous library of digitized books to train its Claude LLMs. In addition to purchasing and scanning physical books (a la Google for its Google Books project), Anthropic also downloaded thousands of books that had been illegally uploaded to pirate sites, copying them multiple times for use in AI training.
Anthropic did not seek authors' permission for any of this, arguing (as most AI companies do) that appropriating copyrighted material for AI training is fair use. The authors who brought the suit disagreed, arguing that Anthropic's unpermissioned compiling and copying of their work constituted copyright infringment. (You can see the original complaint here.)
This past June, the judge in the case issued a mixed ruling, determining that while Anthropic's digitzation of physical books, and its employment of its digitized library for AI training, both fit the four factors necessary to qualify as fair use, its downloading of pirated copies did not, and justified a trial on that issue. On July 17, 2025, the judge certified a class of LibGen & PiLiMi Pirated Books authors (LibGen is pirate site Library Genesis; PiLiMi is pirate site Pirate Library Mirror). The class consists of:






