If I go to the bookstore, buy the book, make a scan, and train an LLM with it, how would you enforce your license as an author? The customer never knew that he shouldn’t have been allowed to train LLMs.

Edit: I think I misunderstood the original comment, I thought the idea was to sell books and restrict use for LLM training. If we’re only talking about stuff that’s publicly released, the restriction should be possible.