The United States, as a party only to the Pan American Union and not a member of the International Copyright Union under the Berne-Berlin conventions, has not secured for its citizens general rights of copyright in other countries, without repetition of formalities, and such rights are secured only in the countries designated by Presidential proclamation and according to the formalities of their domestic legislation. It seems, however, that citizens of the United States may obtain general protection throughout the unionist countries by publishing in a unionist country simultaneously with first publication in the United States, and thus coming under the protective provisions of the Berlin convention. The Mexico convention permits citizens of the United States to obtain copyright in other countries ratifying that convention, by deposit at Washington of extra copies for transmission to countries designated, with certified copy of the registration. When the Buenos Aires convention is ratified by other powers nothing more will then be required than the usual application and deposit at Washington and notice of the reservation of rights, preferably in connection with the copyright notice, of which "all rights reserved for all countries" is the most comprehensive form. {Sidenote: "Proclaimed" countries} Under section 8 of the act of 1891, the President "proclaimed" from time to time the existence of reciprocal relations with other countries, which permitted their citizens to obtain copyright in the United States under the act, and American citizens to obtain protection under their respective copyright laws. The question of the _status_ of these countries under the act of 1909 was solved by the proclamation of the President on April 9, 1910, stating that "satisfactory evidence has been received that in Austria, Belgium, Chile, Costa Rica, Cuba, Denmark, France, Germany, Great Britain and her possessions, Italy, Mexico, the Netherlands and her possessions, Norway, Portugal, Spain and Switzerland, the law permits ... to citizens of the United States the benefit of copyright on substantially the same basis as to citizens of those countries," and proclaiming "that the citizens or subjects of the aforementioned countries are and since July 1, 1909, have been entitled to all the benefits of the said Act other than the benefits under section 1, (_e_), thereof, as to which the inquiry is still pending"--the exception being as regards mechanical music. To this list of countries, Luxemburg was added by proclamation of June 29, 1910, and Sweden by that of May 26, 1911. {Sidenote: Mechanical music reciprocity} Under date of December 8, 1910, the first proclamation with respect to the international protection of mechanical music was made by the President, declaring the existence of reciprocal relations with Germany. Belgium, Luxemburg, and Norway were added by proclamation of June 14, 1911.