Report on the Filing or Determination of an Action or Appeal Regarding a Copyright (AO 121) is a document issued by the United States Copyright Office to certify a copyright dispute has been settled. It can be issued for either a claim made by a copyright owner or for a defense against a copyright infringement claim. The report provides the official record of the action or appeal and the outcome of the case. There are two types of Report on the Filing or Determination of an Action or Appeal Regarding a Copyright (AO 121): 1. AO 121A: This form is issued in the case of a copyright infringement complaint. It includes the date on which the complaint was filed, the name of the copyright owner, the name of the defendant, the outcome of the case, and the date on which the report was issued. 2. AO 121B: This form is issued in the case of a copyright defense. It includes the date on which the defense was filed, the name of the copyright owner, the name of the defendant, the outcome of the case, and the date on which the report was issued. Both forms include information about the copyright registration, the basis of the action, the names of the parties involved, and the date and time of the filing. The report also includes an official seal and signature of the Copyright Office, and is valid for two years from the date of issuance.