You really need to learn how to Google terms you don't understand.
I did not say the input was copyrighted. I said the input SUPPORTS copyright protection (HDCP).
Digital video carried on DVI and HDMI connections can be encrypted with copyright protection. The data itself. And while all modern TVs support HDCP, in one form or another, older TVs and monitors didn't always support HDCP copyright protection on their digital inputs. Especially with computer monitors and early digital televisions.
Newer 4K TVs support copyright projection HDCP 2.2.
TRY THIS LINK IT WILL HELP YOU OUT IMMENSELY:
For all those people who find it more convenient to bother you with their question rather than to Google it for themselves.
lmgtfy.com