alt Hacker News> The GFDL imposes restrictions on distribution, not copying, so merely downloading a copy imposes no obligation on you and so isn't a copyright infringement either.
The restrictions fall not only on verbatim distribution, but derivative works too. I am not aware whether model outputs are settled to be or not to be (hehe) derivative works in a court of law, but that question is at the vey least very much valid.
It's the third sentence of the article:
> the district court ruled that using the books to train LLMs was fair use but left for trial the question of whether downloading them for this purpose was legal.