> ...which otherwise you don't have.
Why not? If I own a chair, I have the right to use it. If I own a copy of the software (that I paid for in a store, for example), then there is nothing in law that says that I cannot use it. I have rights over what I own. Nothing restricts that.
Copyright law exists to protect software writers by providing them with a means to make money making software. This law restricts my ability to make copies. There is no law that restricts my ability to use what I own.
