Your smart TV isn't just a screen anymore. Depending on the TV and it's settings, it can use Automatic Content Recognition (ACR) to identify what's playing on the display including content coming from external devices connected through HDMI. That means your TV may be able to recognize what you're watching even when the content isn't coming from the TV's own Netflix, YouTube or other built-in apps. And that's where things get interesting. Your TV can recognize more than you think ACR works by analyzing what's displayed and creating a digital fingerprint that can be matched against known content. Research has found ACR operating across different smart-TV platforms and sources, including streaming apps, broadcasts, game consoles and HDMI-connected devices . VIZIO's current privacy documentation, for example, explicitly says its ACR technology can recognize programming, advertisements, gaming content and devices connected through HDMI when vie...