The GP was trying to play back Amazon DRM content via AirPlay, so HDMI/HDCP should only be relevant to the "last-mile" connection between the AirPlay receiver and an external display (so, if the receiver is a Mac laptop's internal display or a smart TV, not at all).
AFAIK, DRM video playback over AirPlay only works from within iOS apps that explicitly support AirPlay[1], not via generic iOS/macOS screen mirroring.
That's true but my reply was solely to ladzoppelin where they seem to need to have an HDCP-compliant display connected. I was just offering an option besides a 25 ft HDMI cable.
AFAIK, DRM video playback over AirPlay only works from within iOS apps that explicitly support AirPlay[1], not via generic iOS/macOS screen mirroring.
[1] https://support.apple.com/en-us/HT204289#iOS