Are you asking if you are liable?
Are you prepared to risk being sued?
They do quite often sue. They never used to but they have become more aggressive recently basically because they lost control of the industry.
You have to proceed on the basis that they may sue.
It really comes down to whether you are prepared to bear the risk and deal with litigation if they do.
Quite often the signs are not adequate.
But you would have to go to court to argue that if it does go that far.