HDCP do not supported in NVIDIA linux drivers?
What might be the way to solve this problem?
Why do you need HDCP support on a free open source OS? What is your application/what are you trying to accomplish?
Nvidia blob is not free nor opensource. This make the OS NOT free.
That said, is true that the entire hdcp chain has to be “trusted”, and afaik, no player for linux exists that is hdcp compliant.