From HOWtoGeek:
"Short of buying a new television or giving up on your video game project the only way to deal with your HDCP compliance problem is to buy a cheap HDMI splitter that ignores HDCP requests.
We really wish we were kidding, but that’s the secret media center ingredient that has helped thousands of consumers and the very same secret ingredient that we use here at How-To Geek when we need to take screenshots of an on-screen menu to showcase a product we’re reviewing.
Specifically, we use the ViewHD 2-Port 1×2 Powered HDMI Splitter (Model: VHD-1X2MN3D) ($20) because even among cheap HDMI splitters, there is no consistency to whether they will be HDMI compliant (even, sometimes, among products from the very same company). A little careful reading and using the Amazon reviews search function goes a long way toward ferreting out cheap splitters that other consumers have had success with.
To use the splitter, simply put it between the output and display device. For example, say you have a simple setup where you just want to plug a Chromecast into an old monitor. Instead, you’d plug the Chromecast into the input on your HDMI splitter, and then use an HDMI cable to connect the output on the splitter to your display. If you have a new audio-video receiver that doesn’t play nice with your old HDTV, plug all your HDMI devices into the receiver and then place the HDMI splitter between the receiver and the display."