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If he didn't use the 1080p TV and only had the 4K, then 1 of the following would happen:

1 black screen

2 1080p playback

3 4K playback

if he got (2), he wouldn't be able to tell if the problem was with (HDCP+4K) or just (4K). Proving that it works in 1080p on a TV that doesn't even know what 4K is establishes the baseline and eliminates the ambiguity.



Okay, that makes sense, I was definitely confused about that. Thanks for clearing that up for me.




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