But it's why the things work the way they do. I'm not here to convince you. I thought I'd help you find out more about this area so you don't lose a lot of time chasing after this area like a lot of folk do. I don't know how more specific you want this to be, that is, HDMI/HDCP and the rule about content rendering is something on the web.
There is an exception in the rules for OTA but not USB.