My Roku 3 device was working fine then all of sudden this past week it began giving the error "HDCP Error Detected" and "Content disabled unauthorized" messages. I did all of the Roku support recommended suggestions. (i.e. Unplug the HDMI cable, device. and tv and replug back in. Tried a different HDMI cable. Tried plugging the Roku 3 into another, exact same brand tv and model, and got the same error messages.) NOTE: This other exact same brand tv and model has the Roku Express connected to it and that works fine, as well as I have the Roku Ultra connected to another tv and tried swapping the HDMI cables from each of these with each tv and Roku device. Every Roku device, tv and HDMI cable works with each other tv and HDMI cable except for the Roku 3 device.
So, from what I can see, the issue appears to be with the Roku 3 device causing these "HDCP Error Detected" and "Content disabled unauthorized" errors. Cause that is the only common denominator with the error messages, TVs and HDMI cables.
Side note, even though I receive the "HDCP Error Detected" error message when first turning on the tv, the Roku 3 was playing the NASCAR race fine for me through 3/4 of the race yesterday. Then all of a sudden the screen went blank and then gave the "Content disabled unauthorized" error message.