you honestly think they will still use the secure key method, if they do it serves them right for not learning from there mistakes, they never learned there lesson from the yanks as there cable has been getting hacked for a lot longer the British cable tv has.
If YOU HACK A SB5100 CABLE MODEM I RECOMMEND YOU KEEP IT TO 10MB, as they cap 20mb it appears its easier to check out for the 20mb than the 10mb i would think thats due to numbers.