(1) in the case of an unpublished work, one complete copy or phonorecord;

(2) in the case of the published work, two complete copies or
phonorecords of the best edition;

(3) in the case of a work first published outside the United States,
one complete copy or phonorecord as so published;

(4) in the case of a contribution to a collective work, one complete
copy or phonorecord of the best edition of the collective work. Copies
or phonorecords deposited for the Library of Congress under section
407 may be used to satisfy the deposit provisions of this section, if
they are accompanied by the prescribed application and fee, and by
any additional identifying material that the Register may, by
regulation, require. The Register shall also prescribe regulations
establishing requirements under which copies or phonorecords
acquired for the Library of Congress under subsection (e) of section 407,
otherwise than by deposit, may be used to satisfy the deposit
provisions of this section.


(c) Administrative Classification and Optional Deposit.-

(1) The Register of Copyrights is authorized to specify by
regulation the administrative classes into which works are to be
placed for purposes of deposit and registration, and the nature of the
copies or phonorecords to be deposited in the various classes
specified. The regulations may require or permit, for particular
classes, the deposit of identifying material instead of copies or
phonorecords, the deposit of only one copy or phonorecord where two