None of the suggestions posted here corrected my HDCP error . . . so I went back to the original error screen and more carefully read the instructions, which turned out to correct the error.
Here is what I did which made it work:
1) Unplug the power cord to the TV.
2) Unplug the power cord to the Roku
3) Unscrew both ends of the HDMI cable to the TV and to the Roku device.
4) Wait 10 minutes
5) Screw in both ends of the HDMI cable to the TV and the Roku Device.
6) Plug the TV power cable back into the electrical source and turn ON the TV
7) Plug the Roku power cable back into the electrical source and wait for Roku to start up again.
So what is the reason for this? I believe somewhere between the TV powering, the Roku powering, and the HDMI connections are both ends produced a corrupted signal causing the error. But instead of isolating which part of the chain was corrupt, the instructions required a complete shutdown and manual disconnect of all hard wired connections.
Just before I used the above successful instructions, I chose to go through the agonizing (but perhaps required) process of reformatting my Roku as if it were new out of the box. That required me to reinstall it and clone in all of my 280 channels from another Roku I have in the house so as not to lose my channel selections. But that took an hour of downloading, followed by a software update and restart. When this failed to rid me of the Error screen, then I following the seven (7) power unplug and cable disconnect steps listed above and the Error screen no longer appeared.
SO perhaps sometimes to the solution is in front of our eyes with a closer more careful reading of the instructions on the error page.
Currently use 2017 Roku 4660 Ultra and Roku 3 (Model 4200x), Model N1000, Software V3.1 build 1011,
Previously owned: 2015 Roku 1 Legacy, and Model 2000c, Software V3.1 build 1011
I agree with you the 7 steps work but it's a temporary fix. I get the error message roughly every 2 weeks since the early November update. In early December I upgraded my TV and all my HDMI cables and yesterday the HDCP Error popped up again. My Roku 2(a 1080p box) is connected straight to the TV using a 8ft HDMI 2.0 cable, no other devices between them.
From online searches it seems like this is an ongoing issue with multiple Roku products over an extended period of time. My brand new roku does this, yet I’ve never had issues with appletv. I’ve used multiple cables without any change in system behavior. Seems like roku engineers need to revamp their products. If I had to do it again I’d recommend another product over roku.
This is a Roku problem and should be resolved by them. I have a Samsung TV with both a Roku Ultra and a Firestick 4K. If I use the firestick I get a message it is adjusting the frame rate at the same point the Roku gets the error. The firestick handles the adjustment correctly, the Roku does not.