The copy, copies, or phonorecords of an original work of authorship that are placed in the Copyright Office to support the claim to copyright in the work or to meet the mandatory deposit requirement of the 1976 Copyright Act. Deposits become part of the public record and may be selected by the Library of Congress for its collections. To send to the Copyright Office a copy, copies, or phonorecords of an original work of authorship to support a claim to copyright or to meet the mandatory deposit requirement of the 1976 Copyright Act.