I experienced it once. Two security CM's came over to me and asked what I was doing. I explained I was taking photos of Pandora and even showed them some shots from my camera.
They then told me that I'm not allowed to put my camera over the wall there (mind you, this wall is something like 10ft high and I was 30+ feet away from it as you have to have quite a bit of distance from it to see anything worth seeing). I agreed to their terms and kept taking pics.
This was months ago. Not sure if their policy has changed, but I had no issues yesterday for the 10 minutes I spent taking pics.