These provisions, it may be noted, are a singular mixture, almost without precedent, of acceptance and denial of the "exclusive right" of the author or copyright proprietor. {Sidenote: Text provisions} In respect to the importation of books in relation with copyright, the provisions of the American code as to prohibition and limited permission are specific and detailed, as follows: {Sidenote: Prohibition of piratical copies} "(Sec. 30.) That the importation into the United States of any article bearing a false notice of copyright when there is no existing copyright thereon in the United States, or of any piratical copies of any work copyrighted in the United States, is prohibited. {Sidenote: Permitted importations} "(Sec. 31.) That during the existence of the American copyright in any book the importation into the United States of any piratical copies thereof or of any copies thereof (although authorized by the author or proprietor) which have not been produced in accordance with the manufacturing provisions specified in section fifteen of this Act, or any plates of the same not made from type set within the limits of the United States, or any copies thereof produced by lithographic or photo-engraving process not performed within the limits of the United States, in accordance with the provisions of section fifteen of this Act, shall be, and is hereby, prohibited: _Provided, however_, That, except as regards piratical copies, such prohibition shall not apply: "(a) To works in raised characters for the use of the blind; "(b) To a foreign newspaper or magazine, although containing matter copyrighted in the United States printed or reprinted by authority of the copyright proprietor, unless such newspaper or magazine contains also copyright matter printed or reprinted without such authorization; "(c) To the authorized edition of a book in a foreign language or languages of which only a translation into English has been copyrighted in this country; "(d) To any book published abroad with the authorization of the author or copyright proprietor when imported under the circumstances stated in one of the four subdivisions following, that is to say: "First. When imported, not more than one copy at one time, for individual use and not for sale; but such privilege of importation shall not extend to a foreign reprint of a book by an American author copyrighted in the United States; "Second. When imported by the authority or for the use of the United States; {Sidenote: Library importations} "Third. When imported, for use and not for sale, not more than one copy of any such book in any one invoice, in good faith, by or for any society or institution incorporated for educational, literary, philosophical, scientific, or religious purposes, or for the encouragement of the fine arts, or for any college, academy, school, or seminary of learning, or for any State, school, college, university, or free public library in the United States;