They're all German Shepherds. A long time ago the Czech government created a kennel called pohranicni straze...which means border patrol. These dogs were raised and trained for that one job. There were some great bloodlines out of there and the only accepted a few outside studs/bitches every once in a while. They also only allowed a few dogs to be placed and bred (there were like 3 select Czech kennels from what I remember that would get the "washouts").
Recently this line has been very sought after for the "coolness" factor by the general public and also for their working ability by people that know what they're looking for. I've never actually seen one, so I can't really tell you what exactly is so special about them. Today I'm pretty sure the pohranicni straze kennel is a privately owned and run kennel that still produces some very excellent dogs.
My suggestion to you is that if you are interested in protection work or Schutzhund. Find a club or a training facility and check them out. See their dogs work, see what you like about some dogs, what you don't like about others. Reading online about the huge generalizations of the Czech, DDR, West German, ect lines isn't going to help you one bit until you actually see what people mean by prey drive, defense, hard/soft, strong/weak, ect. At a club you can really find the type of dog you want to work with and either ask that member where they got their dog, or see if they're going to be breeding that dog. You'll end up with the perfect dog for you that way.
I have a half DDR/West German dog...I thought my next one was going to be 100% DDR or Czech. After being at a club and seeing dogs work, I know exactly what bitch I want a puppy out of and she's west German WL. Doesn't matter to me one bit because I've seen her work and love everything about her. The generalizations about drive, maturity, ect when discussing the overall general line doesn't mean squat.
CD RE TC HIC 7/10