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You would need a device that supports HDCP if your output source is utilizing it. That's the entire point of the system. The video signal is encrypted and will only exchange the data with a device which can cryptographically authenticate itself as an authorized HDCP receiver. Getting that certificate requires proving that they are going to follow the rules ...

Are you sure that the Lenovo and 2011 MacBook support HDMI out via their displayPort? Native DisplayPort signals are not compatible with HDMI. What a DisplayPort to HDMI adapter actually does is simply put a DisplayPort that supports HDMI signaling in to the appropriate mode to send an HDMI signal, but it is not a required part of the DisplayPort standard. ...