In fact copyright law is not based only on international treaty, but is outlined in our consitution Art. 1 Sec 8 "To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries". The fact of a INTERNATIONAL copyright is a seperate issue. I belive we (the US) did not even belong to the bern convention untill the 1980's.
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In fact copyright law is not based only on international treaty, but is outlined in our consitution Art. 1 Sec 8 "To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries". The fact of a INTERNATIONAL copyright is a seperate issue. I belive we (the US) did not even belong to the bern convention untill the 1980's.