Article 1, Section 8, Clause 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;

1.An Act for Preventing the Frequent Abuses in Printing Seditious Treasonable and Unlicensed Books and Pamphlets and for Regulating Printing and Printing Presses 14 Chas. 2, c. 33 (1662)
2.An Act for the Encouragement of Learning, by Vesting the Copies of Printed Books in the Author's or Purchasers of Such Copies 8 Anne, c. 19 (1709)
3.William Blackstone, Commentaries 2:406, 1766
4.Massachusetts Constitution of 1780, CH. 5, SEC. 2
5.James Madison, Act Securing Copyright for Authors, Virginia House of Delegates, 16 Nov. 1785
6.Records of the Federal Convention
7.James Madison, Federalist, no. 43, 288, 23 Jan. 1788
8.James Rumsey to Thomas Jefferson, 6 June 1789
9.Alexander Hamilton, Report on Manufactures, 5 Dec. 1791
10.Levi Lincoln, Patents for Inventions, 26 May 1802
11.St. George Tucker, Blackstone's Commentaries 1:App. 265--67, 1803
12.Thomas Jefferson to Isaac McPherson, 13 Aug. 1813
13.William Rawle, A View of the Constitution of the United States 104--6 1829 (2d ed.)
14.Joseph Story, Commentaries on the Constitution 3:§§ 1147--50, 1833
15.Wheaton v. Peters