Facebook parent Meta Platforms Inc. is the latest target of litigation aimed at Big Tech companies that allegedly use copyright-protected books to train their artificial intelligence models without the authors' consent.

Lieff Cabraser Heimann & Bernstein and Cowan, DeBaets, Abrahams & Sheppard filed a class action on behalf of lead plaintiff Christopher Farnsworth, author of the "Nathaniel Cade" fiction series, against Meta on Tuesday, claiming that it stole "hundreds of thousands" of copyrighted books from a pirated online collection to build "Llama," its large language model set. The complaint, filed in the U.S. District Court for the Northern District of California in San Jose, alleged copyright infringement under 17 U.S.C. §501. Counsel has yet to appear for the defendant.