Visiting from out of state to see a friend in White Christmas and I took a photo of the final bow of the performers - without a flash - in order to share it with the cast, and I was pulled aside by an employee and forced to delete the photo as they watched me to ensure it was deleted.
I specialize in copy right and entertainment law in Los Angeles, and found this to be stunningly petty.
You can decide if that's an environment you'd like to go to for your entertainment.