The Constitution\u27s Progress Clause purports to restrict Congress\u27s copyright power to works that promote the Progress of Science and useful Arts. For most of the past two centuries, this Clause has set a minimal content-based standard for copyright eligibility. It denied protection for a work whose content did not rise to the level of useful knowledge, in that the work either lacked compositional value or portrayed an immoral or unlawful subject matter. As evidenced by judicial and scholarly writings, this construction of the Progress Clause was consistent with the 1903 decision in Bleistein v. Donaldson Lithographing Co., where the Court warned against judges imposing their own aesthetic values in determining copyright eligibility....