Copyright. Copyright law of United States, act of Mar. 4, 1909, in force July 1, 1909, as amended by acts of Aug. 24, 1912, Mar. 2, 1913, Mar. 28, 1914, July 3, 1926, and May 23, 1928; with Rules for practice and procedure under sec. 25, by Supreme Court, [and] with act of Dec. 18, 1919.