  Property ownership of a thing comprises a bundle of rights, the central ones being the right to exclude others from the use of the thing and to control its use oneself. If I own my body, I can exclude others from using it, and I have the right to decide its movements and control what may be done to it. The Lockean supposes that in a world in which self-owning persons confront unowned material resources, moveable and immoveable parts of the Earth, all persons initially have an equal right to use the resources, taking turns if there is crowding. The Lockean supposes this free use regime is provisional. Any individual is permitted to claim any part of the Earth as her private property provided her doing so leaves “enough and as good” for others. Nozick interprets this Lockean Proviso as follows: One's appropriation and continued holding of a part of the Earth as one's private property is morally permissible provided that all persons affected by this claim of ownership are rendered no worse off by it than they would have been if instead the thing had remained under free use (Nozick 1974, chapter 7; compare Simmons 1992, chapter 5). (A different account will need to be given for intellectual property, property rights in ideas.)