Judge grants partial summary judgment to Anthropic, ruling training copies were fair use. 

Judge William Alsup just issued his order on summary judgment. It’s a major win for the plaintiffs Bartz, even though the court ruled that the use of copies to train Anthropic’s model were fair use. Significantly, the court also ruled that Anthropic’s acquisition of pirated books from shadow libraries (Books3, LibGen, and Pirate Library Mirror) that Anthropic used to create its own general library at Anthropic was copyright infringement.

Source: Judge Alsup grants partial summary judgment to Anthropic, ruling training copies were fair use. But Judge rules no fair use in pirated copies of books used to build a central library. They are infringing.