This is a legal opinion on an appeal filed by a lottery industry entity against the decision of the 13th Federal Court of the Federal District, which denied the request for a preliminary injunction to block illegal gambling websites in Rio de Janeiro. The entity argued that, according to the STF decision, states have the authority to regulate lottery services in their territories. The court partially granted the preliminary injunction, ordering the telecommunications regulatory agency to verify the legitimacy of the websites and take action, if necessary. The gaming association had its request to participate as amicus curiae denied.