I need some help.

We have a very nice expensive leather couch. That is, it used to be before I got my cats. They jump on it and their back claws dig into the leather and put little holes/claw marks in it. I can't tell you how p**sed my dad is about this. We currently have a blanket covering the back, but it would defeat the point of having it to cover it completely. Is there anyway I can keep them off it? Keep their claws out of it? I know there is that soft paws but I wouldn't if it would work because it would still dig in.

Does anyone else have leather and cats?