03/21/1947
https://www.presidency.ucsb.edu...
"It shall be understood that the term of copyright in any case is not and cannot be altered or affected by this proclamation, and that as provided by the aforesaid title 17, no liability shall attach u..."
"Now, Therefore, I, Harry S. Truman, President of the United States of America, under and by virtue of the authority vested in me by the aforesaid title 17, do declare and proclaim:"
"WHEREAS it is necessary, in the interest of the national security and defense, that plans be prepared and implemented whereby government and non-government radio stations may be silenced or required t..."
"Every government department and agency shall give such aid and assistance to the Secretary of Defense, and shall render such cooperation with one another, as may be necessary to accomplish the purpose..."