I had a different case but then the same problem actually I had upgraded to 4.2.1 and since after that I was getting the HDCP error with apple tv 2 and I had tried out a no of solution to solve the issue, but then none of them worked and I finally took the tv to the apple store and then they problem was finally solved by getting the an atv with 4.1, actually I had tried out downgrading to 4.1 but then it was not possible after getting upgraded to 4.2.1, I think that you might be having the same case if you have started facing the error message after upgrading to 4.2.1.
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