Definition
Plagiarism is the act of taking another person's written expression, ideas, or language and presenting them as one's own original work. In legal contexts, plagiarism sits at the intersection of two distinct concerns: (1) the moral and professional wrong of misrepresenting authorship, and (2) the actionable legal wrong of copyright infringement, when the appropriated material is protected and the taking rises to the level of piracy.
The two concerns do not always overlap. Plagiarism can occur without copyright infringement — as when an author lifts passages from a work in the public domain and claims them as original. Copyright infringement can occur without plagiarism — as when a party copies protected expression without concealing the source but still reproduces more than fair use permits. Legal remedies attach primarily to the latter; institutional, reputational, and professional consequences attach primarily to the former.
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Common Language
Modern common usage (Wiktionary): Copying another person's ideas, text, or other creative work and presenting it as one's own, especially without permission.
Historical common usage (Webster's 1913): The act or practice of plagiarizing; that which is plagiarized.
The gap between common and legal meaning here is structural rather than definitional. Ordinary usage treats plagiarism as a single wrong — taking credit for someone else's work. Legal usage splits that wrong into two separate inquiries: whether there is a cognizable legal cause of action (typically copyright infringement or, in limited contexts, passing off), and whether there is merely an ethical or reputational violation without a legal remedy. A researcher who encounters plagiarism in a legal source cannot assume a lawsuit is available; the term may be doing purely moral or descriptive work.
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Common Confusion
PLAGIARISM vs. COPYRIGHT INFRINGEMENT: These terms are not synonymous, though they are routinely treated as interchangeable in lay sources and even in some older legal texts. Copyright infringement requires an unauthorized reproduction or distribution of protected expression; it is a statutory cause of action with defined remedies. Plagiarism requires misrepresentation of authorship; it carries no independent cause of action in most common law systems. The Bouvier entry correctly notes that plagiarism becomes legally actionable only when it "amounts to piracy" — that is, when the taking crosses into copyright infringement. Plagiarizing a public domain work, or plagiarizing an idea rather than its expression, may be ethically condemned but is generally not legally redressable.
PLAGIARISM vs. PIRACY (LITERARY): Older legal sources, including Bouvier and Anderson, use "piracy" to describe unauthorized copying of protected works. This is distinct from plagiarism in emphasis: piracy focuses on the act of unauthorized reproduction; plagiarism focuses on the misrepresentation of authorship. Anderson's entry directs readers to PIRACY rather than defining plagiarism independently, reflecting this older practice of treating literary plagiarism as a subset of piracy.
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Why It Matters in Research
The central research trap is anachronism. Modern readers associate plagiarism with a rich body of academic integrity policy and institutional sanction. Historical legal sources use the term far more narrowly, as a descriptor for a category of literary theft that may or may not give rise to legal consequences. When Bouvier conditions the remedy on whether the plagiarism "amounts to piracy," he is drawing a line that modern copyright law draws differently and with much greater statutory precision.
Researchers working in 19th-century sources will find plagiarism treated as a near-synonym for literary piracy, with equity courts enjoining the conduct when a copyright existed. The modern doctrinal separation between the moral wrong (plagiarism) and the legal wrong (infringement) was not consistently maintained in the older literature. Conflating them in either direction produces analytical error.
A second research consideration: plagiarism appears in several distinct legal contexts that require different analysis — academic and professional discipline proceedings (no copyright issue; the question is misrepresentation), copyright litigation (the question is substantial similarity and unauthorized copying, not authorship credit), and occasionally passing-off or unfair competition claims (where false attribution may harm a plaintiff's commercial reputation). Each context draws on different doctrine; the single term PLAGIARISM does not resolve which body of law applies.
The Bouvier entry also begins a sub-entry on PLAGIARISM OF NEWS, which implicates a separate and distinct area of unfair competition law (associated historically with the International News Service v. Associated Press line of doctrine) and should not be conflated with ordinary copyright-based plagiarism analysis.
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Historical Dictionary Support
Black's (1st and 2nd editions) offer nearly identical definitions, emphasizing both the appropriation of written composition and the appropriation of ideas, and expressly include passing off as one's own work as the defining element. The consistency across editions signals that Black's treated this as settled descriptive terminology rather than evolving doctrine.
Bouvier adds important analytical structure: the legal wrong arises only when the plagiarism rises to piracy, tying the remedy explicitly to the existence of a copyright. This is the more doctrinally precise framing. Bouvier also cross-references QUOTATION, acknowledging that not all borrowing is wrongful — a distinction critical to what becomes the fair use doctrine.
Anderson's entry is purely a cross-reference to PIRACY, which reflects how the older common law tradition subsumed literary plagiarism within the broader category of literary piracy rather than treating it as a distinct legal concept.
What the historical sources collectively miss: they do not address plagiarism in non-literary contexts (software, data, visual art), they predate the statutory copyright framework that eventually gave copyright infringement its modern shape, and none grapples with the now-significant distinction between plagiarism as an ethical violation and infringement as a legal one.
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Jurisdictional Note
No jurisdiction recognizes plagiarism as an independent common law tort. Legal remedies for the conduct described as plagiarism are pursued under copyright law (a federal matter in the United States), passing-off or unfair competition doctrine (which varies by jurisdiction), or, where applicable, moral rights statutes (more robust in civil law jurisdictions, particularly France and Germany, than in U.S. law).
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Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Copyright — for the statutory framework governing the actionable dimension of literary appropriation.
See Law Mind Encyclopedia: Piracy (Literary) — for the historical treatment of unauthorized copying in equity and early common law.
See Law Mind Encyclopedia: Fair Use / Fair Dealing — for the doctrinal limit on what copying gives rise to legal liability.
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