The Generic Animal Drug and Patent Restoration act requires that each sponsor of an approved animal drug must submit to the U.S. Food and Drug Administration (FDA) certain information regarding patents held for the animal drug or its method of use. The Act requires that this information, as well as a list of all animal drug products approved for safety and effectiveness, be made available to the public. This list must be updated monthly under the provisions of the Act. The list, known as the "Green Book," was first published in January 1989. Updates have been added monthly since then with the list published in its entirety each January.