"Rent seeking" is by definition trying to extract payments ("rent") from value you didn't create. Charging for access to value that results solely from your act of creation (like "Captain Marvel") is literally the opposite of rent seeking.

Aren't you a lawyer? Copyright is a textbook example of rent seeking. After the first copy is sold, restricting re-copying is rent seeking: extracting money without adding more value.

Show me a textbook that uses that example, because it would be a shitty textbook. You’re not creating additional value after the first sale, but you’re also not recovering the full market value of the creation from the first sale. Imagine painting the Sistene Chapel and charging $10 a pop to see it. Is that rent seeking?