EULAs and Returnability of opened software. (Score 1)

Perhaps I missed something, but the ability to "return" opened software is often rather minimal from my experience, this to discourage an old fashioned use of a store like a software library. Implication of the above --> The Software Distributors Store policy would then be in control of whether the EULA is valid or not? Or is the manufacturer going to refund the software cost directly. Or are stores not accepting returns themselves breaking a law