Let's say I sell you a basketball with some restrictions. For instance, you are never allowed to kick the ball. If you ever kick the ball, some pre-defined pena

Let's say I sell you a basketball with some restrictions. For instance, you are never allowed to kick the ball. If you ever kick the ball, some pre-defined penalty is imposed. You might say that I didn't sell the ball. I sold a bundle of rights regarding the ball, but I retained some other bundle of rights. Your gym membership accords you some rights, but not all rights to the gym equipment. Do you think that should be illegal? As long as a contract clearly delineates which rights are included and excluded I don't understand why you would want this to be illegal. You might question why somebody would buy a car that contains a radio but the purchase of the car doesn't include the radio and the new owner is not allowed to manipulate the radio. It may not make sense to you. But that doesn't make the arrangement illegal.