In this situation, where you are being affected by HDCP/SOC (the copyright protection softwares that block the video and/or audio when using HDMI) and the only option you have is HDMI, the best option would be to invest in an HDMI Splitter. This will bypass those softwares and allow the signal to pass through without a problem.
We do have a link to purchase a splitter on our accessories page, which I will link below:
However, you can also find these in just about any local electronics retailer if you don't want to wait or you are looking for a better deal.
I hope this helps!!