The American copyright law of 1909 prescribes exactly the method of securing copyright, and makes clear the cases in which non-compliance invalidates copyright. Previous to 1909 copyright was secured by complying exactly with the statutory requirements of (1) the delivery to the Librarian of Congress on or before the day of publication, in this or any foreign country, of a printed (including typewritten) copy of title or description of the work, (2) the insertion in every copy published of the prescribed copyright notice, and (3) the deposit not later (under the law of 1891) than such day of publication (earlier law allowing ten days after publication) of two copies of the best edition of a book or other article, or a photograph of a work of art (as to date of deposit of which last the law was not explicit); and any failure to comply literally and exactly with these conditions forfeited the copyright. {Sidenote: Present American basis} The American code of 1909 substitutes an entirely different basis for securing copyright. Copyright now depends upon (1) publication with the notice of copyright, and (2) deposit of copies, these copies in the case of books and certain other works to be manufactured within the United States. The accidental omission of the copyright notice from "a particular copy or copies" does not invalidate the copyright though it may relieve an innocent trespasser from penalty as an infringer; but failure to deposit within a specified time, or false report as to manufacture, makes the copyright not valid. {Sidenote: Provisions of 1909} The general provisions as to formalities are as follows (sec. 9): "That any person entitled thereto by this Act may secure copyright for his work by publication thereof with the notice of copyright required by this Act; and such notice shall be affixed to each copy thereof published or offered for sale in the United States by authority of the copyright proprietor, except in the case of books seeking _ad interim_ protection under section twenty-one of this Act"; and (sec. 10): "That such person may obtain registration of his claim to copyright by complying with the provisions of this Act, including the deposit of copies, and upon such compliance the Register of Copyrights shall issue to him the certificate provided for in section fifty-five of this Act." {Sidenote: Publication}