It is specifically provided (sec. 41) that copyright is distinct from the property in the material object, which accomplishes for the artist the important result that when he sells his painting he does not transfer the copyright, but retains that for himself unless he specifically contracts with the buyer to include in the sale the copyright or the right to copyright. This adopts into the law the decision of the courts that copyright does not pass with a painting unless distinctly included in the transfer. The provision (sec. 41) is specific that the copyright "is distinct from the property in the material object copyrighted, and the sale or conveyance, by gift or otherwise, of the material object shall not of itself constitute a transfer of the copyright, nor shall the assignment of the copyright constitute a transfer of the title to the material object." Thus the author of a work of art has two separate properties, the painting, statue or other work in itself, on the one hand, and the copyright or the right to copyright on the other, neither of which is transferred by the transfer of the other unless both are specifically included in the transfer. {Sidenote: Manufacturing clause covers lithographs and photo-engravings} {Sidenote: Foreign subjects excepted} The copyright in certain classes of reproductions of works of art is dependent however on manufacture in this country, as in the case of books. This provision no longer includes photographs as in the preceding law, but is confined specifically (sec. 15) to "text produced by lithographic process, or photo-engraving process," "illustrations within a book consisting of printed text and illustrations produced by lithographic process, or photo-engraving process, and also to separate lithographs or photo-engravings, except where in either case the subjects represented are located in a foreign country and illustrate a scientific work or reproduce a work of art." It is further provided that "in the case of the book ... if the text be produced by lithographic process, or photo-engraving process ... the copies so deposited shall be accompanied by an affidavit ... that such process was wholly performed within the limits of the United States." This affidavit, therefore, is not required in the case of separate lithographs or photo-engravings. The manufacturing provisions chiefly concern the publishers of books, but they imply that artists cannot send works abroad to have reproductions made. But by the opinion of January 9, 1911, approved by the Attorney-General, a design, drawing, or painting made and located abroad intended as "the first step" for lithographic reproduction, may be registered, if a "work of art"--which question of fact is to be determined by the Register of Copyrights; and such lithographic reproductions of it may be imported. {Sidenote: German post cards}