To us, it means the fundamental digital video television standard that we rely on for basic satellite service. DVB @ Wikipedia is good enough description.
Some things that are -not- DVB, are 4DTV, a pay TV satellite standard, and anything DirecTV broadcasts over satellite.
Wiki didn't have much to say about PVR and DVR .
The two terms seem to be used interchangeably, in my experience.
Though, I'm sure some marketing wag thinks they are entirely different. -