LG sits at exactly the location where screenshots are possible.

Eventually, a digital signal needs to be converted into pixels on a screen. Once that happens, it's trivial to also pipe those pixels into a screenshot.

It's the reason DRM for digital media is pretty dumb IMO. The most sophisticated DRM still has to be decoded at some point for the end user to enjoy it. It can always be broken with a camcorder (though quality suffers). However, there exists devices which decode the HDMI signal so doing a pure digital signals.