17 U.S.C. § 102 is the section of the Copyright Act that defines what copyright covers. Under § 102(a), protection reaches “original works of authorship fixed in any tangible medium of expression.”1Office of the Law Revision Counsel. 17 U.S. Code 102 – Subject Matter of Copyright: In General Under § 102(b), it never reaches an idea, procedure, process, system, method of operation, concept, principle, or discovery, no matter how the author explains or illustrates it. Everything else in copyright law builds on that two-part rule.
The Two Conditions in Section 102(a)
A work has to clear two hurdles at once. It must be original, and it must be fixed. Miss either and § 102 does not apply.
Originality
“Original” in copyright law does not mean novel or impressive. The Supreme Court explained in Feist Publications, Inc. v. Rural Telephone Service Co. that originality means the author created the work independently, without copying, and that the work contains “some minimal degree of creativity.”2Justia. Feist Publications, Inc. v. Rural Tel. Serv. Co. The Court described that bar as extremely low. Almost anything with a spark of creative choice qualifies.
Two photographers can shoot the same sunset from the same overlook and both hold valid copyrights, as long as neither copied the other. What fails the test is purely mechanical work. In Feist itself, an alphabetical white-pages directory did not qualify, because listing every name in the service area in alphabetical order involved no creative selection or arrangement.
Raw facts sit outside protection entirely. No one owns the temperature in Chicago on a given Tuesday or the population of Brazil. An author who selects and arranges facts in an original way can protect that particular arrangement, but the facts themselves stay free for everyone.
Fixation
The second condition is that the work be captured in some form stable enough to be perceived, reproduced, or otherwise communicated for more than a fleeting moment. Ink on paper qualifies. So does a file saved to a hard drive, audio recorded to a server, or paint on canvas. Works that need a device to be perceived, like a digital audio file or a program stored on a server, still count as fixed.
What does not qualify is an improvised solo nobody records, or an off-the-cuff speech with no transcript. The instant someone hits record or writes it down, fixation happens.
The Eight Categories
Section 102(a) lists eight types of works that can qualify. The Copyright Act defines “including” as “illustrative and not limitative,” so this list is not a closed set,3Office of the Law Revision Counsel. 17 U.S. Code 101 – Definitions but in practice virtually every copyrightable work fits one of these buckets:
- Literary works — anything expressed in words, numbers, or similar symbols, including novels, articles, catalogs, databases, and computer programs.
- Musical works, including any accompanying words.
- Dramatic works, including any accompanying music.
- Pantomimes and choreographic works.
- Pictorial, graphic, and sculptural works.
- Motion pictures and other audiovisual works.
- Sound recordings, meaning the captured performance, distinct from the underlying composition.
- Architectural works, meaning the design of a building.
The categories overlap in useful ways. A recorded song contains two separate copyrights: the musical work owned by the songwriter, and the sound recording owned by whoever fixed the particular performance. When a band covers another artist’s song, the songwriter still owns the composition and the band owns the new recording.4U.S. Copyright Office. Sound Recordings and Musical Works
Human Authorship Is Required
Section 102 protects “works of authorship,” and both the Copyright Office and the courts read authorship to mean human authorship. Material generated entirely by artificial intelligence, with no meaningful human creative input, does not qualify.5U.S. Copyright Office. Copyright and Artificial Intelligence Part 2: Copyrightability
In Thaler v. Perlmutter, an applicant tried to register a visual artwork produced autonomously by an AI system, listing the machine as the author. The district court and the D.C. Circuit both rejected the claim, holding that the Copyright Act requires a human author.6U.S. Court of Appeals for the D.C. Circuit. Thaler v. Perlmutter
The harder question is the mixed case: a human using AI as a tool. The Copyright Office evaluates these individually, looking at how much creative decision-making the human actually contributed. Typing a short prompt and accepting whatever the model produces is unlikely to qualify. Selecting, arranging, and substantially modifying AI outputs as part of a larger creative project has a stronger claim.5U.S. Copyright Office. Copyright and Artificial Intelligence Part 2: Copyrightability
What Section 102(b) Excludes
Subsection (b) is the other half of the rule, and it does a lot of work. Copyright never extends to an idea, procedure, process, system, method of operation, concept, principle, or discovery, “regardless of the form in which it is described, explained, illustrated, or embodied” in the work.1Office of the Law Revision Counsel. 17 U.S. Code 102 – Subject Matter of Copyright: In General
You can copyright a textbook that teaches a new accounting method. You cannot copyright the method. Anyone else is free to use the same method and write their own book about it. This is the idea-expression dichotomy, and it traces back to the Supreme Court’s 1879 decision in Baker v. Selden, which held that a copyright in a book about a bookkeeping system did not give the author exclusive rights over the system itself.7Justia. Baker v. Selden – 101 U.S. 99 (1879) Congress codified that reasoning when it enacted § 102(b).
The exclusion also keeps copyright out of patent law’s territory. Functional inventions, scientific discoveries, and mathematical formulas belong to the patent system if they qualify at all. Game rules, recipes reduced to bare steps, and mathematical proofs sit on the unprotectable side of the line. The creative language explaining any of them can be protected. The knowledge itself cannot.
The Merger Doctrine
Sometimes an idea can only be expressed in one or a very small number of ways. When that happens, courts treat the expression as having merged with the idea, and neither receives protection. Otherwise the first person to write a simple concept down could effectively own the concept by locking up the only way to say it. The doctrine gives § 102(b) real force even when someone has managed to reduce an idea to words.
Software Shows Both Sides at Once
Computer software is the sharpest illustration of how § 102(a) and § 102(b) work together. Code is protected as a literary work, both in human-readable source form and in compiled machine form. But the algorithms, processes, and methods of operation the code implements fall inside § 102(b)’s exclusions.
The practical result: a competitor can study what your software does and independently write different code that does the same thing. What they cannot do is copy your actual code. Non-literal elements like the structure and organization of a program can sometimes qualify for protection, but where the structure follows directly from the function, or where only a few logical arrangements exist, merger and the other § 102(b) principles strip protection away. The line between protectable expression and unprotectable function in software remains one of the most litigated questions in copyright law.
Protection Is Automatic, but Registration Still Matters
Copyright under § 102 exists the moment an original work is fixed. You do not need to register, file paperwork, or add a © symbol to have protection.8U.S. Copyright Office. What Is Copyright? A poem in a notebook is protected whether or not the author ever contacts the Copyright Office.
Registration is a separate question, governed by a different section of the Act, and it matters for enforcement. For works originating in the United States, you generally must register (or receive a refusal) before filing an infringement suit in federal court.9Office of the Law Revision Counsel. 17 U.S. Code 411 – Registration and Civil Infringement Actions Timely registration also unlocks statutory damages and attorney’s fees, which are often what makes a lawsuit worth bringing. Eligibility under § 102 and the ability to enforce that eligibility are two different things, and it pays to keep them straight.