In 1972, the Supreme Court ruled in Deepsouth Packing Co. v. Laitram Corp . that, under the Patent Act as it was written at that time, it was not an act of patent infringement to manufacture the components of a patented invention in the United States and then ship them abroad for assembly into an end product. In response to this loophole in the patent law that would have allowed potential infringers to avoid liability, Congress added subsection (f) to Â§ 271 of the Patent Act. This statutory provision now states: (1) Whoever without authority supplies or causes to be supplied in or from the United States all or a substantial portion of the components of a patented invention, where such components are uncombined in whole or in part, in such manner as to actively induce the combination of such components outside of the United States in a manner that would infringe the patent if such combination occurred within the United States, shall be liable as an infringer. (2) Whoever without authority supplies or causes to be supplied in or from the United States any component of a patented invention that is especially made or especially adapted for use in the invention and not a staple article or commodity of commerce suitable for substantial noninfringing use, where such component is uncombined in whole or in part, knowing that such component is so made or adapted and intending that such component will be combined outside of the United States in a manner that would infringe the patent if such combination occurred within the United States, shall be liable as an infringer. The patent at issue in Microsoft v. AT&T concerned AT&T's patent on a speech coder-decoder (a codec). A speech codec is a software program that is capable of converting spoken words into a compact code, or vice versa. AT&T brought suit against Microsoft in 2001, alleging that the speech codec included in Microsoft's Windows operating system infringes its patent. Microsoft filed a motion to exclude evidence of alleged liability arising from foreign sales of Windows, pursuant to Â§ 271(f) of the Patent Act. Microsoft exports overseas a limited number of U.S.-made "golden master disks" containing the machine-readable software code of its Windows operating system; foreign computer manufacturers may use these disks to replicate the master disk in generating multiple copies of Windows for installation on foreign-assembled computers that are then sold to foreign customers. In support of its motion to limit liability and any damages award, Microsoft argued that: (1) software is intangible information such that it could not be a "component" of a patented invention within the meaning of Â§ 271(f); and (2) even if the Windows software were a "component," no actual "components" had been "supplied" from the United States as required by Â§ 271(f) because the copies of Windows installed on the foreign-assembled computers had all been made abroad. In considering Microsoft's motion, the U.S. District Court for the Southern District of New York first cited previous Federal Circuit decisions supporting the proposition that software is patentable. Furthermore, the court explained that Â§ 271(f) does not limit "components" to only physical machines or tangible structures, but rather could include intangible information or data. Thus, the district court rejected Microsoft's argument that software could not be a "component" of a patented invention under Â§ 271(f). As for the copies made abroad from the golden master disk sent from the United States, the district court held that such copies still came within the scope of Â§ 271(f) in light of the legislative intent of the statute to prohibit the circumvention of infringement through exportation. After Microsoft appealed, a divided panel of the Federal Circuit affirmed the district court's decision. The appellate court relied on prior Federal Circuit case law that had held that "without question, software code alone qualifies as an invention eligible for patenting, and ... statutory language [does] not limit section 271(f) to patented 'machines' or patented 'physical structures,' such that software [can] very well be a 'component' of a patented invention for the purposes of Â§ 271(f)." The Federal Circuit also ruled that, because "the act of copying is subsumed in the act of 'supplying,'" the exportation of the golden master disks, with the specific intent that they be replicated abroad, is an act that comes within the meaning of Â§ 271(f)'s "supplied or caused to be supplied in or from the United States." In dissent, Federal Circuit Judge Randall R. Rader objected to the majority opinion's view that "supplies" within the meaning of Â§ 271(f) includes the act of foreign "copying." Judge Rader expressed concerns that such an interpretation is, in effect, an impermissible "extraterritorial expansion" of U.S. patent law because it reaches "copying" activity overseas. In his view, AT&T's remedy lies not in U.S. law, but rather the law of the foreign country in which the infringement due to copying occurred. The Supreme Court accepted Microsoft's petition for a writ of certiorari in October 2006, in order to answer two questions: 1. Whether digital software codeâan intangible sequence of "1's" and "0's"âmay be considered a "component[] of a patented invention" within the meaning of Section 271(f)(1); and, if so, 2. Whether copies of such a "component[]" made in a foreign country are "supplie[d] ... from the United States." In a 7-1 decision issued in late April 2007, the Court reversed the Federal Circuit's judgment, holding that Microsoft was not liable for patent infringement under Â§ 271(f), as the statute is currently written, when foreign-manufactured computers are loaded with Windows software that has been copied abroad from a master disk or an electronic transmission sent by Microsoft from the United States. In regard to the first question posed in the case, Associate Justice Ruth Bader Ginsburg, writing for the majority, explained that there are two ways to conceptualize software: One can speak of software in the abstract: the instructions themselves detached from any medium. (An analogy: The notes of Beethoven's Ninth Symphony.) One can alternatively envision a tangible "copy" of software, the instructions encoded on a medium such as a CD-ROM. (Sheet music for Beethoven's Ninth.) Abstract software code does not qualify as a component, for purposes of triggering liability under Â§ 271(f), because it is an "idea" lacking physical embodiment and thus it cannot be a "usable, combinable part of a computer." Justice Ginsburg analogized software in the abstract to a detailed set of instructions, similar to that of a blueprint. But information sent abroad that instructs someone on how to build the components of a patented invention does not come within the scope of Â§ 271(f); she observed that Congress, in enacting the statutory provision, did not include the export of design tools such as blueprints, schematics, templates, and prototypes. Thus, for the Windows software to be considered a "component" under Â§ 271(f), the software code must be encoded or otherwise expressed in some sort of tangible mediumâa computer-readable software "copy" such as a CD-ROM. The Court thus declined to adopt AT&T's characterization of software in the abstract as a combinable component that qualifies for Â§ 271(f) liability. In reaching its answer to the second question, the Court largely agreed with Judge Rader's dissent from the Federal Circuit's opinion. The copies of Windows used for installation on the foreign computers had been made abroad; those copies were not "supplied" from the United States, even though the master disk from which they were duplicated had been exported. According to Justice Ginsburg, this distinction is legally relevant for liability purposes under Â§ 271(f); further, such liability is not affected by the ease of copying software. Noting that keys or machine parts may also easily be copied from a master, she observed that Â§ 271(f) "contains no instruction to gauge when duplication is easy and cheap enough to deem a copy in fact made abroad nevertheless 'supplie[d] ... from the United States.'" Furthermore, Justice Ginsburg argued that the traditional presumption against extraterritorial application of United States law, particularly in patent law, would help favor the Court construing Â§ 271(f) in a manner that excludes intangible software code and copies of software made abroad. Echoing Judge Rader's advice, Justice Ginsburg observed that "[i]f AT & T desires to prevent copying abroad, its remedy lies in obtaining and enforcing foreign patents." At the end of the opinion, Justice Ginsburg conceded that the Court's decision effectively creates a "loophole" for software makers to avoid liability under Â§Â 271(f). However, she explained that the Court would resist using the "dynamic judicial interpretation" that would be needed to adjust the patent law "to account for the realities of software distribution." The majority opinion expressly invited Congress to consider whether this apparent loophole in favor of software companies, to the extent that it may exist, merits closing. Interestingly, the majority opinion of the Court excluded footnote number 14 , which was supported by only four justices (Justices Kennedy, Scalia, Souter, and Ginsburg). This footnote reads as follows: Microsoft suggests that even a disk shipped from the United States, and used to install Windows directly on a foreign computer, would not give rise to liability under Â§Â 271(f) if the disk were removed after installation. We need not and do not reach that issue here .