"But did you know that most smart TVs also analyze things you watch on devices connected via HDMI? A modern smart TV is just as capable of mining a 20-year-old DVD for advertising data as it is your Netflix queue. Thankfully, we've found a few ways to help keep your TV-viewing experience as private as possible."
"HDMI-CEC Metadata: This is a very technical term for an HDMI device's ID. When you connect a game console, Blu-Ray player, or other playback device, it sends "device ID" data to your TV, primarily to allow a single remote to control your TV and any connected devices. However, it does also track how long you use that device (ex, "Profile A used Input 1 [PlayStation 5] for X hours)."
"Automatic Content Recognition (ACR): This method feels much more "spy-like" given how much data it tracks. The TV will take tiny "fingerprint screenshots" of each pixel on the screen, regardless of the source, and then feed that data into an algorithm to identify exactly what movie, show, or video game you are playing on an HDMI-connected device."
Smart TVs monitor both app streaming and media played through HDMI-connected devices to support personalized ads and recommendations. HDMI-CEC metadata shares device IDs and enables single-remote control while also logging device use and duration. Automatic Content Recognition (ACR) captures tiny "fingerprint screenshots" of screen pixels and matches them against databases to identify exact movies, shows, or games. ACR can operate even when the TV functions only as a display. Smart TVs can mine DVDs and other non-streaming sources for advertising data. Disabling ACR and related tracking settings can reduce data collection and improve viewing privacy.
Read at ZDNET
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