Mandatory deposit : Définition juridique

A requirement of the 1976 Copyright Act that copies or phonorecords of every work published in the United States be sent to the Copyright Office within 3 month of publication whether or not copyright registration is sought. In general, two copies are required. Deposits are made available to the Library of Congress for its collections or for exchange or transfer to any other library. Works deposited under the mandatory deposit requirement may also be used for copyright registration.