#NAB News
I did a bit of further research.
It seems that HBO and others are using what is called Digicipher which is
an encryption system that happens to also multiplex the signal. I am not
sure whether they use MPEG or not. Our beloved friend Randell Jessup from
Commodore posted in rec.video.satelitte on usenet that Digicipher doesn't
use MPEG.
Now the new service called DirectTV (DBS) does use MPEG.. but it is a
direct to the customer service and not meant to distribute programming to
the cable companies.