be void as against any subsequent purchaser or mortgagee for a valuable consideration, without notice, whose assignment has been duly recorded.
Sec. 45. That the register of copyright shall, upon payment of the prescribed fee, record such assignment, and shall return it to the sender with a certificate of record attached under seal of the copyright office, and upon the payment of the fee prescribed by this Act he shall furnish to any person requesting the same a certified copy thereof under the said seal.
Sec. 46. That when an assignment of the copyright in a specified book or other work has been recorded the signee may substitute his name for that of the assignor in the statutory notice of copyright prescribed by this Act.
Sec. 47. That all records and other things relating to copyrights required by law to be preserved shall be kept and preserved in the copyright office, Library of Congress, District of Columbia, and shall be under the control of the register of copyrights, who shall, under the direction and supervision of the Librarian of Congress, perform all the duties relating to the registration of copyrights.
Sec. 48. That there shall be appointed by the Librarian of Congress a register of copyrights, at a salary of four thousand dollars per annum, and one assistant register of copyrights, at a salary of three thousand dollars per annum, who shall have authority during the absence of the register of copyrights to attach the copyright office seal to all papers issued from the said office and to sign such certificates and other papers as may be necessary. There shall also be appointed by the Librarian such subordinate assistants to the register as may from time to time be authorized by law.
Sec. 49. That the register of copyrights shall make daily deposits in some bank in the District of Columbia, designated for this purpose by the Secretary of the Treasury as a national depository, of all moneys received to be applied as copyright fees, and shall make weekly deposits with the Secretary of the Treasury, in such manner as the latter shall direct, of all copyright fees actually applied under the provisions of this Act, and annual deposits of sums received which it has not been possible to apply as copyright fees or to return to the remitters, and shall also make monthly reports to the Secretary of the Treasury and to the Librarian of Congress of the applied copyright fees for each calendar month, together with a statement of all remittances received, trust funds on hand, moneys refunded, and unapplied balances.
Sec. 50. That the register of copyrights shall give bond to the United States in the sum of twenty thousand dollars, in form to be approved by the Solicitor of the Treasury and with sureties satisfactory to the Secretary of the Treasury, for the faithful discharge of his duties.
Sec. 51. That the register of copyrights shall make an annual report to the Librarian of Congress, to be printed in the annual report on the Library of Congress, of all copyright business for the previous fiscal year, including the number and kind of works which have been deposited in the copyright office during the fiscal year, under the provisions of this Act.
Sec. 52. That the seal provided under the Act of July eighth, eighteen hundred and seventy, and at present used in the copyright office, shall continue to be the seal thereof, and by it all papers issued from the copyright office requiring authentication shall be authenticated.
Sec. 53. That, subject to the approval of the Librarian of Congress, the register of copyrights shall be authorized to make rules and regulations for the registration of claims to copyright as provided by this Act.