If I buy an entire row of seats on a long flight so no one is next to me, can the airline sell one of my empty seats to someone or will they respect the fact that the empty seats are mine to do as I p

If I buy an entire row of seats on a long flight so no one is next to me, can the airline sell one of my empty seats to someone or will they respect the fact that the empty seats are mine to do as I please with?