sorry, you're missing a word there. you should be asking "name one piece of property you can use undetectably as you please without restriction", and the answer

sorry, you're missing a word there. you should be asking "name one piece of property you can use undetectably as you please without restriction", and the answer is "nearly all of them". what i do in the privacy of my own home, without affecting other people and with stuff i legally own should be unrestricted; pretty much every case in which it isn't involves a conceptual failing on the part of either the law, the entity i obtained that piece of property from, or both.