Mid 2011 Mac Mini iTunes HDCP error.

Hi

I have a Mid 2011 Mac Mini 16GB of ram and 1TB SSD running El Capitan 10.11.4 with iTunes 12.3.3 the mac is running through a Sony Bravia KDL-50W700A. I have up until recently been able to play content I have purchased with not problems. Now I am unable to play the content I have purchased be it newly purchased or previously. I had an idea this may be related to copyright protection so attempted to play one of the tv shows in Quicktime and received the below error.

This movie cannot be played because it is on a display that is not authorised to play protected movies. Try moving this window to a different display or disconnecting any displays that are not HDCP authorised.

I can confirm according to Sonys website that my tv is HDCP compliant. As I am able to watch Netflix on my mac through the tv except if I'm using Safari. I have performed the below troubleshooting.

Attempted multiple purchased content.

Unplugged the HDMI cable which is gold plated Sony and powered off both the Mac Mini and the tv. Then plugged back in and powered up

Altered the display resolution

Checked for updates on both devices

Content worked fine when played on Apple tv and iPhone and iPad and iPod I have not tried my MacBook Pro retina as yet.

I can understand mostly that copyright holders want to be paid for their stuff but perhaps instead of overpaying actors and musicians they should try and assist the very people that pay for the content. As these kind of issues make it harder for people to want to pay and use their stuff legally.

Any assistance would be greatly appreciated.