Actually, the court really only said downloading a pirated book to store in your "library" was bad. The opinion is intentionally? ambiguous on whether the decision regarding copies used to train an LLM applies only to scanned books or also to pirated books. The facts found in the case are the training datasets were made from the "library" copies of books that included scans and pirated downloads. And the court said the training copies were fair use. The court also said the scanned library copies were fair use. The court found that the pirated library copies was not fair use. The court did not say for certain whether the pirated training copies were fair use.