The whole world would not be possible without people re-publishing parts of books to some third party in exchange for money.

Think textbooks. Laws. Medicine.

What's the difference? The size of quotation? The exact wording? Surely re-publishing an entire book word for word is piracy. What if I rewrite the whole book slightly? What if I publish just a part? A rewritten part?

Where do we draw the line with humans and why should the line be different with LLMs?

(I don't have answers to those questions)