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Merger doctrine (copyright law)

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Merger doctrine (copyright law)

The idea–expression divide or idea–expression dichotomy limits the scope of copyright protection by differentiating an idea from the expression or manifestation of that idea.

The European Union Software Directive, Article 1.2, for example, expressly excludes from copyright ideas and principles that underlie any element of a computer program, including those that underlie its interfaces.[1][2] In the United States the 1879 opinion of the Supreme Court in the case of Baker v. Selden[3] elaborated this doctrine, holding that while exclusive rights to the "useful art" (in this case bookkeeping) described in a book might be available by patent; only the description itself was protectable by copyright. In Harper & Row Publishers, Inc. v. Nation Enters., 471 U.S. 539, 556 (1985), the Supreme Court stated that "copyright's idea/expression dichotomy 'strike[s] a definitional balance between the First Amendment and the Copyright Act by permitting free communication of facts while still protecting an author's expression.'" (internal citation omitted). Additionally, in Mazer v. Stein, 347 U.S. 201, 217 (1954), the Supreme Court stated "Unlike a patent, a copyright gives no exclusive right to the art disclosed; protection is given only to the expression of the idea—not the idea itself."

Some of the criticism directed at "intellectual property" is based on the confusion between patents, which may confer proprietary rights in relation to general ideas and concepts per se when construed as methods, and copyrights, which cannot confer such rights.

An adventure novel provides an illustration of the concept. Copyright may subsist in the work as a whole, in the particular story or characters involved, or in any artwork contained in the book, but generally not in the idea or genre of the story. Copyright, therefore, may not subsist in the idea of a man venturing out on a quest, but may subsist in a particular story that follows that pattern. Similarly, if the methods or processes described in a work are patentable, they may be the subject of various patent claims, which may or may not be broad enough to cover other methods or processes based on the same idea. Arthur C. Clarke, for example, sufficiently described the concept of a communications satellite (a geostationary satellite used as a telecommunications relay) in a 1945 paper that it was not considered patentable in 1954 when it was developed (independently) at Bell Labs.

In the English decision of Donoghue v. Allied Newspapers Limited (1938) Ch 106, the court illustrated the concept by stating that "the person who has clothed the idea in form, whether by means of a picture, a play or a book" owns the copyright. In the Australian decision of Victoria Park Racing and Recreation Grounds Co. Ltd v. Taylor (1937) 58 CLR 479 at 498, Latham CJ used the analogy of reporting a person's fall from a bus: the first person to do so could not use the law of copyright to stop other people from announcing this fact.

Some courts have recognized that particular ideas can be expressed intelligibly only in one or a limited number of ways. The French name for this doctrine is Scènes à faire. Therefore even the expression in these circumstances is unprotected, or extremely limited to verbatim copying only. This is true in the United Kingdom and most Commonwealth countries.[4] In the United States this is known as the merger doctrine, because the expression is considered inextricably merged with the idea. United States courts are divided on whether merger constitutes a defense to infringement or prevents copyrightability in the first place, but it is often pleaded as an affirmative defense to copyright infringement.

See also


  1. ^ quoted in Mylly, Ulla=Maija. "Harmonizing Copyright Rules for Computer Program Interface Protection". Louisville, Kentucky: >University of Louisville Louis D. Brandeis School of Law. p. 14. Archived from the original on 5 June 2010. 
  2. ^ "Directive 2009/24/EC of the European Parliament and of the Council of 23 April 2009 on the legal protection of computer programs". Official Journal of the European Union. Archived from the original on 9 November 2010. 
  3. ^ 101 U.S. 99 (1879)
  4. ^ Lai, Stanley (1999). "Chapter V: The Position of Scenes a Faire in English Law". The Copyright Protection of Computer Software in the United Kingdom. Oxford, England: Hart Publishing. pp. 54–56. ISBN . 

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