Mr. Donnacha Anhold:

In days gone by there used to be a person on the ground, who was a man or woman called a forester. That would be the person you could call on to say you wanted to go in on a particular day and were meeting at the gate. Obviously, a lock could be put on the gate to stop third parties, livestock, or wildlife from making their way in. However, if there is a lock on the gate and everyone has a key, then access is not or should not be an issue.