From what I've seen with TSReader and my Hauppauge HVR-1600,
They're not encrypting alot of the SD MPEG2 stuff on the QAM channels.
Comcast told the FCC they were going to encrypt everything. FCC said NO, you're not.
What they are doing is setting the privacy flag on anything that isn't already on analog 2-31.
Discovery is marked "private"
The intended, as far as I understand use for the privacy flag was to label temporary channels (on-demand)
After I made a list, I went back to my Olevia and "unskipped" the flagged channels. Came in fine, but the picture was squished, unless I stretched it to 16:9
Was it worth it? Hardly. And that's why they're doing it.
Most of the Digicipher channels are encrypted.
My QAM list was useless after they re-jumbled the channels; twice since I did it.