In spain, canal plus used to scramble analogue film channels.The reciever used a key,the key had a small chip in it.Effectively it was a card.Not sure if they are still doing so. It was a type of nagra, I think.
Canal+ in Spain is scrambled some of the time - normally for films and sport. I believe it is some sort of nagra system. Interestingly the DTT version is scrambled at the same time though my (UK) Thompson receiver has on at least one occasion ignored this and continued to show the program!