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You'd need the HDCP master key, but you need not be a full-featured endpoint. See https://www.bunniestudios.com/blog/?p=2117 https://www.bunniestudios.com/blog
by bonzini 9y ago
You'd need the HDCP master key, but you need not be a full-featured endpoint. See https://www.bunniestudios.com/blog/?p=2117 https://www.bunniestudios.com/blog/?p=2117 for an example of a device that mixes an incoming HDMI video with a (non-HDMI) overlay video. The device is sold in the US, so it must be considered legal.