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 with the consent of the proprietor of the copyright in such works, or works republished with new matter, shall be regarded as new works subject to copyright under the provisions of this Act; but the publication of any such new works shall not affect the force or validity of any subsisting copyright upon the matter employed or any part thereof, or be construed to imply an exclusive right to such use of the original works, or to secure or extend copyright in such original works."

The provisions of the law regarding the subjectmatter of copyright are completed by the negative provision:

"(Sec. 7.) That no copyright shall subsist in the original text of any work which is in the public domain, or in any work which was published in this country or any foreign country prior to the going into effect of this Act and has not been already copyrighted in the United States, or in any publication of the United States Government, or any reprint, in whole or in part, thereof: Provided, however. That the publication or republication by the Government, either separately or in a public document, of any material in which copyright is subsisting shall not be taken to cause any abridgment or annulment of the copyright or to authorize any use or appropriation of such copyright material without the consent of the copyright proprietor."

It is not to be inferred from the provision as to Government publications, that the United States has itself a right to use copyright material without consent of the copyright proprietor. The sovereignty of the nation is not to transgress the rights of private property, unless in the necessary exercise of war or police powers, as the sovereign state cannot take land over which it is theoretically sovereign from a private