The Federal Circuit’s copyrightability ruling in Oracle has deepened splits in circuit court interpretations of several major copyright doctrines as applied to computer programs. This brief makes three principal points. First, the Federal Circuit’s merger analysis is in conflict with this Court’s ruling in Baker v. Selden, 101 U.S. 99 (1880), and decisions by the First, Second, Fifth, Sixth, and Eleventh Circuits. Second, the Federal Circuit’s interpretation of the scope of copyright protection available to computer programs is at odds with Baker and decisions of the First, Second, Tenth, and Eleventh Circuits. Third, the Federal Circuit’s interpretation of the words and short phrases doctrine cannot be reconciled with holdings of the Third and Sixth Circuits. The merger doctrine holds that expressions in works of authorship are unprotectable by copyright law when, as a practical matter, there is only a limited number of ways to express an idea, fact, or function. When ideas, facts, or functions, in effect, “merge” with expression, copyright protection will be withheld from the merged elements. The merger doctrine fosters socially beneficial competition and ongoing innovation as well as promoting the ongoing progress of science and useful arts, as the Constitution commands. U.S. Const. art. I, § 8, cl. 8. The Federal Circuit’s copyrightability ruling conflicts with Baker in three respects: first, because the Federal Circuit concluded that merger can only be found if a first author had no alternative ways to express an idea when creating his work; second, because it held that constraints on a second comer’s design choices are never relevant to merger; and third, because it ruled that merger is only a defense to infringement, and never raises a copyrightability issue. Post-Baker cases from the First, Second, Fifth, Sixth, and Eleventh Circuits have conceptualized and applied the merger doctrine more broadly than the Federal Circuit. These idea/expression, fact/expression, and function/expression merger cases have resulted in uncopyrightability rulings, which contradict the Federal Circuit’s holding on merger. Beyond merger, the Federal Circuit’s interpretation of the scope of copyright protection available to software innovations conflicts with the rulings of other circuits in four respects. First, the Federal Circuit’s interpretation of the exclusion of methods and systems from copyright’s scope under 17 U.S.C. § 102(b) is contrary to the First Circuit’s interpretation in Lotus Development Corp. v. Borland International, Inc., 49 F.3d 807 (1st Cir. 1995), aff’d by an equally divided Court, 516 U.S. 233 (1996). Second, several circuit courts have ruled in favor of compatibility defenses in software copyright cases. Only the Third and Federal Circuits have rejected them. Third, the Federal Circuit’s conception of “structure, sequence, and organization” (SSO) of programs as protectable expression as long as it embodies a modicum of creativity conflicts with the Second Circuit’s landmark decision, Computer Associates International, Inc. v. Altai, Inc., 982 F.2d 693 (2d Cir. 1992). Altai rejected the conception of SSO as determinative of protectable expression. Id. at 706. Fourth, the Federal Circuit’s assertion that copyright and utility patents can provide overlapping protection to program SSO is in conflict with Baker as well as Tenth and Eleventh Circuit decisions. There is, moreover, conflict among the circuits concerning the protectability of “words and short phrases.” The District Court denied Oracle’s claim in part based on its view that names and short phrases are not copyrightable, but the Federal Circuit held that words and short phrases, such as the names of individual Java declarations, could, if original, be eligible for copyright protection. However, the Third and Sixth Circuits have denied similar claims in cases involving identifiers such as names and numbers. Granting the Petition would enable this Court to resolve this split as well.