Fair point. I'm personally not convinced that distinction is intrinsically meaningful rather than just legally and commercially convenient - especially in the case of libraries or programming languages. Qt is valueless as literature absent independent creative art that uses it to build a program - like screws in a piece of furniture. Charging people to use the component is fine by me, but making their own creative work contingent on third party approval that can be modified or revoked at any time seems unreasonable/immoral even if it's permitted by law.