I think this is some kind of basic copyright control. It did the same thing for me a while back when I was experimenting with asking it for the introductory paragraphs for well known books. Think it was one of the harry potter books, from memory.
That's my guess also, it refuses to provide verbatim quotes from famous novels. But that's not how Copyright works: quoting a short snippet from a long novel is entirely legal! The filter was also blocking quotes from some public domain works, which is just madness. The censors at OpenAI are overdoing things to an insane degree. That whole team seriously needs to be cut down to 10% of their current size, because they…
But if a prompt could have the model just spew out whole books, a few paragraphs at a time maybe due to ChatGPT's limitations, that would definitely not be fair use anymore, and they'd be targeted by big copyright's lawyer army.
I just asked chatgpt if it has books and if it can recite some to me; it can recite e.g. Shakespeare without issue, but it's very cagey with other works still under copyright.