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The idea–expression distinction or idea–expression dichotomy is a legal doctrine in the United States that limits the scope of copyright protection by differentiating an idea from the expression or manifestation of that idea.
The idea–expression divide differentiates between ideas and expression, and states that copyright protects only the original expression of ideas, and not the ideas themselves. This principle, first clarified in the 1879 case of Baker v.
The scope of copyright limitations and exceptions became a subject of societal and political debate within various nations in the late 1990s and early 2000s, largely due to the impact of digital technology, the changes in national copyright legislations for compliance with TRIPS, and the enactment of anti-circumvention rules in response to the ...
Baker v. Selden, 101 U.S. 99 (1879), is a leading Supreme Court of the United States copyright case cited to explain the idea-expression dichotomy. The court held that a book did not give an author the right to exclude others from practicing what was described in the book, only right to exclude reproduction of the material in the book.
Merger doctrine is a simple doctrine in IP law which states that when the expression of an idea can only occur in one or a few different ways or the expression of an idea is a necessary implication of the efficient expression of the idea then the idea merges with the expression and cannot be the subject of a copyright.
United States copyright law protects original expressions but not facts, methods, discoveries, or other ideas being expressed, a doctrine known as the idea–expression distinction. Despite making this distinction, verbatim copying is not always required for copyright infringement, as paraphrasing is also prohibited in certain circumstances. [6]