My favorite one is this.
I think there was only one that suggests pressing the lock door button. But apparently that’s not a universal feature because most of the suggestions tell him to press a button on the touch screen console
The spec is designed to allow enforcement of DRM but i think its up to the devices on either end to enforce that not the cable itself.
Its to prevent people from ripping movies by playing it to a computer thats recording the input instead of a display. But it can also be used by TVs to say "fuck your laptop".