HDCP detection on ADV7623 -P (non-HDCP part)

Hi guys.

Our new HDMI product line will NOT require HDCP so we plan on using the ADV7623 -P part.  What is the best register to monitor to determine if the source is generating HDCP?  Our plan is if there is a HDCP source detected then force free run and display a message to the user via the sink that our board requires a non-HDCP source device.

Thanks!

- Chris