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Keywords: HDMI RF leakage attack. Putting them in a search engine, I was able to find an article about it quickly.

* DVI (HDMI) and DisplayPort digital video interfaces in electromagnetic eavesdropping process

https://sci-hub.se/https://doi.org/10.1109/EMCEurope.2019.88...

You can also search for "side-channel" and "TEMPEST".

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The signals analyzed below are LVDS and VGA, not exactly HDMI, but also an interesting read - because the LVDS signal is used to drive the LCD panel and it's also a major source of leakage.

* Exposing Computer Monitor Side-Channel Vulnerabilities With TempestSDR

https://hackaday.com/2020/07/15/exposing-computer-monitor-si...

The author of the program even wrote a paper on that for a master degree.

https://raw.githubusercontent.com/martinmarinov/TempestSDR/1...