High-bandwidth Digital Content Protection (HDCP) was released in the mid-2000s, contemporaneous with the Apple Cinema Display line of external monitors:

  • 23", 30" Apple Cinema Display
  • 24", 27" Apple LED Cinema Display
  • Apple Thunderbolt Display

Did any of the above monitors support HDCP?

Can a connected macOS system display be queried to determine if it supports HDCP?

This is relevant as many of the adapters needed to connect these monitors to a modern USB-C / Thunderbolt Mac have "HDCP on" and "HDCP off" versions of the same adapter. Which should be used?

How can you determine if an Apple external monitor supports HDCP?


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