(a) Except as provided by subsection (c), and subject to the provisions of subsection (e), the owner of copyright or of the exclusive right of publication in a work published with notice of copyright in the United States shall deposit, within three months after the date of such publication-- (1) two complete copies of the best edition; or (2) if the work is a sound recording, two complete phonorecords of the best edition, together with any printed or other visually perceptible material published with such phonorecords. Neither the deposit requirements of this subsection nor the acquisition provisions of subsection (e) are conditions of copyright protection. (b) The required copies or phonorecords shall be deposited in the Copyright Office for the use or disposition of the Library of Congress. The Register of Copyrights shall, when requested by the depositor and upon payment of the fee prescribed by section 708, issue a receipt for the deposit. (c) The Register of Copyrights may be regulation exempt any categories of material from the deposit requirements of this section, or require deposit of only one copy or phonorecord with respect to any categories. Such regulations shall provide either for complete exemption from the deposit requirements of this section, or for alternative forms of deposit aimed at providing a satisfactory archival record of a work without imposing practical or financial hardships on the depositor, where the individual author is the owner of copyright in a pictorial, graphic, or sculptural work and (i) less than five copies of the work have been published, or (ii) the work has been published in a limited edition consisting of numbered copies the monetary value of which would make the mandatory deposit of two copies of the best edition of the work burdensome, unfair, or unreasonable. (d) At any time after publication of a work as provided by subsection (a), the Register of Copyrights may make written demand for the required deposit of any of the persons obligated to make the deposit under subsection (a). Unless deposit is made within three months after the demand is received, the person or persons on whom the demand was made are liable-- (1) to a fine of not more than $250 for each work; and (2) to pay into a specially designated fund in the Library of Congress the total retail price of the copies or phonorecords demanded, or, if no retail price has been fixed, the reasonable cost of the Library of Congress of acquiring them; and (3) to pay a fine of $2,500, in addition to any fine or liability imposed under clauses (1) and (2), if such person willfully or repeatedly fails or refuses to comply with such a demand.