While a labelled brand has been available in the past, producers Fox have prepared their own recipe in response to continued illegal merchandise sales. And although the official Duff Beer will only be available in South America at first, it could go on sale elsewhere.

Fox boss Jeffrey Godsick tells the Wall Street Journal: "Once you see enough piracy, you're faced with two choices - one is deciding to fight, and the other is deciding to go out into the market with it