Restoring mmcblk0p6 will restore full DRM!
First off, I don't know if this has been posted, everywhere I looked on the subject was inconclusive on weather or not it actually works.
I finally unlocked my TF700 after owning it for almost a year! Before I unlocked I backed up /dev/block/mmcblk0p6 because I didn't want to loose the HD content I own in Play movies. I checked after the unlock and sure enough the HD button was gone (and there was a noticeable loss in quality). So i restored /dev/block/mmcblk0p6, rebooted, and tried again. My results, It worked! The HD button was back, and so was the quality! I took screenshots after I unlocked, and after I restored the DRM. Unfortunately you aren't able to take screenshots of Play Movies, so you cant see the difference in quality, but you can see the HD button.
The first picture is right after I unlocked, the second is after restoring DRM