Use Form CA When: An earlier registration has been completed in the Copyright Office; and Some of the facts given in that registration are incorrect or incomplete; and you want to place the correct or complete facts on record. Purpose of Supplementary Copyright Registration: As a rule, only one basic copyright registration can be made for the same work. : Once basic registration has been made for a work, any author or other copyright claimant or owner of any exclusive right in the work or the duly authorized agent of any such author, other claimant, or owner who wishes to correct or amplify the information given in the basic registration may submit Form CA. Instant Download after purchase.