Forget VideoGuard, It's an NDS company and we don't want to give them any more money. The best option VM could go for is PowerVU which was developed by Scientific Atlanta. All of the Scientific Atlanta boxes VM use already are PowerVU compatible with an OTA software update. PowerVU does not use a card as all key information is in the box. PowerVU has not been hacked and all VM has to do is simulcrypt PowerVU and Nagravision until all the old non Scientific Atlanta boxes break and have been replaced with Scientific Atlanta ones then switch off Nagravision thus knocking out all piracy. Job Done.
More info here
http://en.wikipedia.org/wiki/PowerVu