That DVR has copy protection in many forms to stop this from happening.
If you don't believe, then call up the supplier of the DVR and ask them how to accomplish your goal.
I have a DirecTV HD DVR. I just bought a bluray recorder for my computer. I want to record onto Bluray the hockey games in the up coming Stanley Cup Playoffs so that I can clear the hard drive on the DVR.(Its smaller than I'ld like but directv has no upgrades)I have HDMI, component out, and digital optical out as choices. I would like help with video cards, audio cards, editing software, etc. I will probably add another 500Gb hard drive to store stuff on until I can burn it.