The _ad interim_ provision requires the same formalities and fee as in the case of domestic works, except that only one copy of the foreign work in English need be deposited, and that this deposit copy need not contain the statutory notice of American copyright. The claimant is given thirty days after publication abroad in which to request reservation and a second thirty days after deposit of the foreign copy within which to publish or cause to be published an edition manufactured in America and thus to complete his copyright. This gives a period of _ad interim_ protection, ranging from thirty days to sixty days, within which to obtain permanent copyright, the exact period depending upon the number of days elapsing after publication before deposit of the foreign copy in the Copyright Office. Thus a copy deposited on the day of publication will have thirty days in all within which to secure permanent copyright by the publication of the American-made edition, while a copy deposited on the thirtieth day after publication will have sixty days in all; but the failure to deposit the foreign copy within thirty days after publication, or the failure to publish an American-made edition within thirty days after such deposit, will forfeit the right to obtain copyright protection and throw the foreign work into the public domain, despite the _ad interim_ registration. When an American-made edition with notice of copyright can be published in America simultaneously with its publication abroad, _ad interim_ protection is of course rendered unnecessary; and such simultaneous publication is the simplest and best practice for publishers to adopt. {Sidenote: Omission of copyright notice} It may also be emphasized here that the notice of copyright can be omitted only from foreign-made copies and must be included in the American-made edition. The American publisher desiring to reprint a book published abroad in the English language within sixty days after publication, without consent of the copyright proprietor, must therefore assure himself, by inquiry from the Copyright Office, whether the work has been registered _ad interim_. The printing of an American copyright notice on the foreign edition in anticipation of the publication of an American-made edition and the deposit of copies thereof within the statutory requirements is a questionable practice, as a failure to publish American-made copies in the United States, because of defective publishing arrangements or a printers' or binders' strike, would make such notice a false notice of copyright. The copyright term in the case of such foreign work in the English language dates, it would seem, from the date of publication abroad rather than from the date of publication of the American-made edition; but this would be of importance only toward the expiration of the original term and in connection with the renewal term. {Sidenote: Books only ad interim}