For most of these cases, the jurisdiction of the federal district courts is concurrent with that of the state courts. In other words, a plaintiff can choose to bring these cases in either a federal district court or a state court. Congress has established a procedure whereby a party, typically the defendant, can "remove" a case from state court to federal court, provided that the federal court also has original jurisdiction over the matter (meaning that the case could have been filed in federal court initially). If the party that initially filed the case in state court believes that removal was improper, that party can ask the district court to "remand" the case to the state court system. For certain matters, such as patent and copyright infringement disputes and prosecutions for federal crimes, the jurisdiction of the district courts is exclusive of that of the state courts, meaning that only federal courts can hear those cases.