Whether you’re betting on Super Bowl squares or college basketball tournament brackets, sports betting isn’t just legal in many states – it’s big business. But while the majority of sports wagers are placed with legal bookmakers, some state laws still limit the type of betting that can take place. Official betting is a new form of wagering that’s designed to help legal operators maximize profits by limiting the potential for certain bets.

In a move to protect their revenue streams, some US leagues have started requiring that any betting operator licensed in their territory must use official data provided by the sports league to offer tier 1 sports wagers. While this is intended to limit some types of wagers, it’s a controversial policy that’s already been challenged in court by sportsbook operators and a handful of state lawmakers.

The NFL, MLB and NHL all have rules prohibiting players and team employees from placing bets on their own league events if they’re in the same room as a legal sportsbook. In fact, the NFL requires every player to sign a statement acknowledging the league’s gambling rules outlined in its collective bargaining agreement. The NHL also has a similar policy for its teams and employees, but it’s not posted anywhere on the internet.

The NHL doesn’t publicly take a position for or against sports betting, but its Vegas Golden Knights were the first major league team to open a sports book in Nevada and the league has signed partnerships with William Hill and MGM Resorts International. The NBA has a more hands-on approach, but the league and its team owners have also filed multiple lawsuits against New Jersey in an attempt to block its sports gambling law.