I have OCed there once at the Cary location on Walnut. There are no signs on the door, and no one said anything to me about it. However, there was an unarmed security guard that apparently thought he was being slick in his following me around. He even followed me out in to the parking lot, where I then turned and looked at him and shook my head. He turned around and went back inside. :P No words exchanged with anyone.