{Sidenote: Deposit} It is further required (sec. 12) that "if the work is not reproduced in copies for sale, there shall be deposited the copy, print, photograph, or other identifying reproduction" required as above stated, "accompanied in each case by a claim of copyright." The new Copyright Office Rules and Regulations schedule (17) among unpublished works that may be registered "(_c_) photographic prints; (_d_) works of art (paintings, drawings, and sculpture), and (_e_) plastic works," and states specifically as to the deposit in such cases: "19. (2) In the case of photographs, deposit one copy of a positive print of the work. (Photo-engravings or photogravures are not photographs within the meaning of this provision.) "20. (3) In the case of works of art, models or designs for works of art, or drawings or plastic works of a scientific or technical character, deposit a photographic reproduction." As deposit in the case of an unpublished work takes the place of publication and deposit in the case of works reproduced for sale, there can be no claim for statutory protection of an unpublished work of art without the deposit of the identifying copy, and the general provision (sec. 13) for fine and for voiding of copyright in the case of non-deposit, has, of course, no bearing on unpublished works. Any action or proceeding in respect to an unpublished work not registered by deposit must therefore be under common law and not under statutory provision. {Sidenote: Summary of requirements} To sum up, the author of a work of art, who is exhibiting his painting or statue or other work and not multiplying copies for sale, will assure himself of full protection if before such exhibition he places on the original work, in some visible but not obtrusive fashion, the letter C inclosed in a circle with his name or mark, and deposits a photograph of such work with the Librarian of Congress or in the mails addressed to him, accompanied by a claim of copyright,--for which an application form (J2, "photograph not reproduced for sale") is furnished on request, by the Copyright Office from Washington,--with inclosure of one dollar. As soon as the artist multiplies copies for sale, or permits reproduction of his work, as in a newspaper report of an exhibition, for instance, he must then take the precaution of depositing two copies of such reproduction as provided in general by the act, and it is further provided (sec. 18) "that on some accessible portion of such copies or of the margin, back, permanent base, or pedestal, or of the substance on which such copies shall be mounted, his name shall appear." In case two copies are not so deposited, it is probable that a fine and forfeiture of copyright would ultimately ensue, as indicated in section 13. {Sidenote: Material and immaterial properties distinct}