I assume that you are aware of the prohibition of recording in a casino's premises. Each and every rule must serve a purpose, so what's the intention of such rule? If you go to a restaurant, bar or club they allow you to record as long as you don't disturb other customers. At the casinos it's not the case, I'm sure they don't do it in order to protect their patrons from unwanted publicity. I dare to guess that by preventing recording you avoid being accused with video evidence (?). Actually I don't know what should I assume, any suggestions?