Idea-Expression Divide or Idea-Expression Dichotomy.
Idea-Expression Dichotomy is embodied in Section 102(b) of the copyright code. Only the original "expressions" contained in copyrightable works can actually receive copyright protection. Idea-Expression Dichotomy denies protection to the ideas which underlie copyrightable works. The first amendment provides that "Congress shall pass no law abridging the freedom of speech." The concept originated in copyright law.
Intellectual property laws are generally designed keeping Idea-Expression Dichotomy in mind to protect the fixed expression of an idea rather than the fundamental idea itself. The idea-expression dichotomy discharges copyright's first amendment duties because the application of copyright protection to expressions, but not to ideas, serves to prohibit only speech that is constitutionally valueless.
Examples of Idea-Expression Dichotomy or Idea-Expression Divide
Copyright may not subsist in the idea of a man on an expedition, but may subsist in a book which follows that expedition. If the methods or processes described in a technical non-fiction work are patentable they may be the subject of various patent claims, whereas the fundamental underlying idea may not be. An adventure novel provides an illustration of the concept. Copyright may subsist in the work as a whole, or in any artwork contained in the book, but generally not in the idea or genre of the story.
The idea-expression divide which is also referred to as idea-expression dichotomy is a concept which explains the function of intellectual property laws, designed to protect the fixed expression or manifestation of an idea rather than the fundamental idea itself.
Justice Hand once stated that illicit copying need not be
word for word "else a plagiarist would escape by immaterial variations." Nichols
v. Universal Pictures Corp., 45 F.2d 119, 121 (2d Cir. 1930). Some of the criticism
directed at "intellectual property" is based on the notion that intellectual
property laws confer proprietary rights in relation to general ideas and concepts per se.