There's not a workaround, as HDCP is a technology that doesn't allow for a workaround, either practically or legally.
The problem is that the receiver isn't validating the TV. The firmware update or reset that I'd suggest would be first to call Dish and have them update your box, or refresh/reset the box (they can often do that while you're on the phone with them) and see if that helps.
When did this issue start occurring?
Seems as if my Dish network receiver does not recognize my Samsung TV (connected via HDMI cable) as having HDCP. As a result, I cannot view certain content. Searching the web, there seem to be many HDCP issues with Samsung TVs, not specific to the service provider (Dish) or Receiver (VIP612) I am using. Is there a workaround or firmware update from Samsung I can use?