"GPT-4 was found to have memorized titles such as the "Harry Potter" children's books, Orwell's "Nineteen Eighty-Four", "The Lord of the Rings" trilogy, the "Hunger Games" books, "Hitchhiker’s Guide to the Galaxy", "Fahrenheit 451", "A Game of Thrones", and "Dune""

https://www.theregister.com/2023/05/03/openai_chatgpt_copyright/