Mandatory deposit under 17 U.S.C. section 407 requires the owner of copyright or the exclusive right of distribution to deposit in the Copyright Office for the use of the Library of Congress two complete copies of the best edition within 3 months after a work is published. The registration process also requires a deposit of a copy, but the registration deposit does not need to be the best edition of the work. In many cases, a registration deposit also fulfills mandatory deposit requirements. The requirements for a registration deposit and a mandatory deposit are not always the same, however, so it may be necessary in some cases to make a separate mandatory deposit in addition to making the registration deposit.