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You don't specify the version of Wireshark you're using, nor your OS which is less than helpful.

HDPC2 dissection is a built-in dissector that has been available since approx. version 1.8 for HDCP2 over TCP. It is a heuristic dissector that is disabled by default, so you must enable it using the menu item Analyze -> Enabled Protocols, search for HDCP2, and the check the box for hdcp2_tcp.