Security Weekly - A CRA Resource: Your TV Still Watches HDMI

Automatic Content Recognition, or ACR, is designed to identify content displayed on smart TVs. Research published at the 2024 ACM Internet Measurement Conference found ACR activity on LG and Samsung TVs even when they were being used as external HDMI displays.

That means the tracking boundary isn't necessarily limited to the TV's own streaming apps. A game console, streaming box, or laptop connected over HDMI can still be content appearing on the TV's screen.

If a TV can recognize what an external device is displaying, should we still think of it as just a display?

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