When the scrambled banner comes up it means that the broadcast is being run through encryption equipment. It does not mean that it is going to be scrambled, it may or may not. Some uplinkers just run eveything on a bouquet through a scrabler and the have the ability to require a subscription to some channels. Shows can be encrypted, for example a sports feed that someone owns rights to, and when the show is over it becomes what we used to call "open key" where everyone gets it. Some channels seem to randomly scramble, i.e. the Chinese channels on IA5 and AMC4.