Copyright Law Glossary: Key Terms and Definitions
Copyright law operates through a precise vocabulary drawn from Title 17 of the United States Code, administrative guidance from the U.S. Copyright Office, and decades of federal case law. Misreading a single term — "derivative work" versus "compilation," for instance, or "exclusive license" versus "assignment" — can determine the outcome of an infringement dispute or a licensing negotiation. This glossary defines the foundational terms that appear most frequently in copyright practice, organized by function and clarified through comparison and contrast.
Definition and scope
Copyright law, codified at 17 U.S.C. §§ 101–1401, governs the legal protection of original works of authorship fixed in a tangible medium of expression. The statutory vocabulary in this body of law is precise and definitional: § 101 alone supplies formal definitions for more than 40 terms. The U.S. Copyright Office, a division of the Library of Congress, administers copyright registration and publishes Compendium of U.S. Copyright Office Practices, Third Edition — the primary interpretive manual for examining copyright claims.
Core terms, defined:
- Authorship — The Copyright Act does not define "author" expressly, but courts applying the statute treat it as the human creator of an original work. Works produced by non-human agents (including automated systems) fall outside protectable authorship under current Copyright Office policy (Copyright Office AI Policy Statement, February 2023).
- Fixation — A work is "fixed" when it is embodied in a copy or phonorecord sufficiently permanent to be perceived, reproduced, or communicated (17 U.S.C. § 101). Purely improvised performances not recorded are not fixed and therefore not protected.
- Originality — Requires only that a work possess a minimal degree of creativity and originate from the author. The Supreme Court set this floor in Feist Publications, Inc. v. Rural Telephone Service Co., 499 U.S. 340 (1991).
- Tangible medium of expression — Any material object — paper, canvas, disk, server memory — in which a work can be fixed.
- Work of authorship — The eight statutory categories under 17 U.S.C. § 102(a): literary works; musical works; dramatic works; pantomimes and choreographic works; pictorial, graphic, and sculptural works; motion pictures and other audiovisual works; sound recordings; and architectural works.
For a broader grounding in how copyright fits within the wider legal system, see Copyright Law Fundamentals.
How it works
Copyright protection attaches automatically at the moment of fixation — no registration or notice is required for protection to exist. However, registration with the Copyright Office within 3 months of first publication (or before infringement begins) is a prerequisite to filing an infringement suit in federal court under 17 U.S.C. § 411 and enables recovery of statutory damages and attorney's fees under § 504–505.
Key operational terms:
- Exclusive rights — The bundle of 6 rights granted to copyright owners under 17 U.S.C. § 106: reproduction, preparation of derivative works, distribution, public performance, public display, and (for sound recordings) digital audio transmission.
- Copyright term — For works created on or after January 1, 1978, protection lasts for the life of the author plus 70 years (17 U.S.C. § 302). Works made for hire endure 95 years from publication or 120 years from creation, whichever expires first.
- Work made for hire — Defined under § 101 in two distinct ways: (a) a work prepared by an employee within the scope of employment, or (b) a specially commissioned work in one of 9 enumerated categories — provided a written agreement designates it as such. The employer or commissioning party holds authorship. See Works Made for Hire for a full breakdown.
- Transfer and licensing — Exclusive licenses and assignments of copyright must be in writing and signed by the owner (17 U.S.C. § 204). Nonexclusive licenses may be oral or implied by conduct.
- Moral rights — Limited to visual art under the Visual Artists Rights Act (VARA), codified at 17 U.S.C. § 106A. VARA grants rights of attribution and integrity to authors of works of visual art — a narrower scope than moral rights regimes in most Berne Convention countries.
- Termination right — Authors (or their heirs) may reclaim transferred copyrights 35 years after transfer by serving advance written notice, under 17 U.S.C. § 203. Works made for hire are excluded from this right.
Common scenarios
Understanding where these terms apply in practice clarifies their operational limits.
Derivative works vs. compilations
A derivative work incorporates preexisting material in a transformed, adapted, or recasted form — a screenplay adapted from a novel, a translation, or an arrangement of a musical composition (17 U.S.C. § 101). Only the new, original contribution receives copyright protection; the underlying work's ownership is unaffected.
A compilation results from selecting, coordinating, or arranging preexisting materials without transforming them. A curated anthology of public domain poems is a compilation; copyright covers only the selection and arrangement, not the poems themselves (17 U.S.C. § 103).
For deeper analysis of how new works built on existing material are classified, see Derivative Works and Compilations.
Fair use
Fair use (17 U.S.C. § 107) is an affirmative defense evaluated through 4 statutory factors:
1. The purpose and character of the use (commercial vs. nonprofit educational; transformative vs. reproductive)
2. The nature of the copyrighted work
3. The amount and substantiality of the portion used
4. The effect on the potential market for the original
Fair use is a case-by-case determination; no bright-line percentage or word count triggers automatic protection. Full factor analysis is covered at Fair Use Doctrine.
The idea-expression dichotomy
Copyright protects expression, not ideas, procedures, processes, systems, or methods (17 U.S.C. § 102(b)). A novel describing a murder method is protected as expression; another author may independently describe the same method in different words. This boundary is foundational to the Idea-Expression Dichotomy.
Public domain
Works enter the public domain when copyright expires, when the owner dedicates the work, or when the work is a U.S. government work created by federal employees in their official capacity (17 U.S.C. § 105). State government works are not subject to the same categorical exclusion. See Public Domain Works for duration tables.
Decision boundaries
Correct application of copyright terms requires distinguishing between concepts that are frequently conflated.
Copyright vs. trademark vs. patent
Copyright protects original expression for a fixed statutory term. Trademark protects brand identifiers (names, logos, slogans) used in commerce, with no fixed expiration so long as use continues, governed by the Lanham Act (15 U.S.C. § 1051 et seq.). Patent protects inventions and functional innovations for 20 years from application filing under 35 U.S.C. § 154. The three systems overlap in edge cases — a logo may be both copyrightable and trademarkable — but the legal standards and agencies differ. A comparative analysis is available at Copyright vs. Trademark vs. Patent.
Exclusive license vs. assignment
An assignment transfers ownership of copyright entirely. An exclusive license grants specified rights without transferring ownership. Practically, both require written instruments under § 204, but reversion under § 203's termination right applies only where the transfer was by the author, not a work-made-for-hire employer.
Registration vs. protection
Copyright protection exists without registration. Registration creates a public record, enables federal suit, and — if obtained before infringement or within 3 months of first publication — unlocks statutory damages between $750 and $30,000 per work (up to $150,000 for willful infringement) under 17 U.S.C. § 504(c). Without registration, a rights holder is limited to actual damages and lost profits.
Infringement vs. fair use vs. license
Unauthorized exercise of any exclusive right constitutes infringement unless the use qualifies as fair use, falls under a statutory exception (such as compulsory licenses under § 115), or is authorized by license. The distinction determines whether an infringement claim survives at the pleading stage under federal copyright jurisdiction ([28 U.S.