I think this is a specious argument. The value in intellectual property is the right to copy it. You can make a similar argument for other property: you own your car, but the right to drive it was not created by you. You own your house, but the right to occupy it and prevent others from occupying it is not created by you. It's not clear if you are arguing that there is some natural right to own and inherit a car that is granted by some authority other than the state and where that authority comes from.