Digital marking?

i just got into dvd burning, and i saw a program that says it wont leave a digital mark on the dvd. can some programs do this. the reason is that the store where i rent dvds has a notice up that if you burn the dvds your membership will be cancelled. i wondered how they would know, but then i figured maybe programs do leave digital marks. any help would be appriciated.

Firstly renting a DVD and copying it is illegal in most countries (if not all).

If however you were backing up an original DVD that you own, there is no way by looking at the original to know if it has been backup’ed up or not.

Nothing in your DVD ROM or burner will leave a mark on a pressed DVD original.