There is no invasion like what you're mentioning in the (recently) current systems. I was a Nielsen household. They use audio tracking via HDMI/optical audio to

There is no invasion like what you're mentioning in the (recently) current systems. I was a Nielsen household. They use audio tracking via HDMI/optical audio to "see" what's being watched, and they can of course tell what TV it's coming from, but that's the extent of it.