ten·ure (tnyr, -yr)
a. The act, fact, or condition of holding something in one's possession, as real estate or an office; occupation.
b. A period during which something is held.
You never got the point - as usual. People are appropriating common wealth for private gain. He goes on and mentions gas, oil and others.He [Prof Mason Gaffney] goes on to list some things which may be abused due to lack of proper tenure because users don't pay the full costs of what they use: