If NVIDIA didn't disable native/driver circumvention of Macrovision,
they'd be in violation of the US DMCA. This is why most remaining
software work-arounds originate in China - they are not subject to
DMCA or its EU equal.

How so? NVidia's drivers never circumvented macrovision at all. They are
now taking proactive steps to deny playback on devices that have chips not
capable of inserting the macrovision data into the video signal whether or
not those chips are enabled for use or not.