>When content was streaming from my AppleTV, Roku would overlay a panel along the bottom-part of the screen proposing that I can watch what I'm currently watching from a variety of other providers. This must mean that the TV set is analyzing the video or audio signal to fingerprint what the content contained, then matching it against a library of content to feed into its profile of my use.

My Roku TV specifically said it didn't analyze HDMI inputs, only Roku channel watching