When the International Copyright Union was created at Berne in 1886, artistic works were conjoined with literary works under like protection throughout the convention and they were specified (art. IV) as covering "works of design, painting, sculpture, and engraving; lithographs, illustrations, geographical charts; plans, sketches, and plastic works relative to geography, topography, architecture, or science in general; in fact, every production whatsoever in the ... artistic domain which can be published by any mode of impression or reproduction." In the final protocol it was specifically provided: "(1) As regards article IV, it is agreed that those countries of the Union where the character of artistic works is not refused to photographs, engage to admit them to the benefits of the Convention, from the date of its coming into effect. They are, however, not bound to protect the authors of such works further than is permitted by their own legislation, except in the case of international engagements already existing, or which may hereafter be entered into by them. It is understood that an authorized photograph of a protected work of art shall enjoy legal protection in all the countries of the Union, as contemplated by the said Convention, for the same period as the principal right of reproduction of the work itself subsists, and within the limits of private arrangements between those who have legal rights." {Sidenote: Paris declaration; 1896} In the amendatory act adopted at Paris in 1896, the final protocol of 1886 was modified respecting architectural and photographic works as follows (1, a, b): "In the countries of the Union in which protection is accorded not only to architectural designs, but to the actual works of architecture, those works are admitted to the benefit of the provisions of the Convention of Berne and of the present additional act. "Photographic works, and those obtained by similar processes, are admitted to the benefit of the provisions of these acts, in so far as the domestic legislation allows this to be done, and according to the measure of protection which it gives to similar national works. "It is understood that the authorized photograph of a protected work of art enjoys legal protection in all the countries of the Union, within the meaning of the Convention of Berne and the present additional act, as long as the principal right of reproduction of this work itself lasts, and within the limits of private conventions between those who have legal rights." {Sidenote: Berlin convention, 1908}