Also known as: idea expression merger doctrine · idea-expression merger doctrine · merger doctrine · idea/expression merger
Written by attorneys · grounded in primary & secondary sources — see below
A copyright principle that denies protection to expression when there is only one or a limited number of ways to express an idea. Protecting the expression in such cases would effectively grant a monopoly over the idea itself.
Ismael Ibrahim creates a short program routine that calculates a standard tax withholding amount. The routine uses the only practical sequence of commands that achieves the calculation. When Ideal Solutions copies the identical sequence, Ismael claims infringement. Because the expression merges with the underlying idea, the copied sequence receives no copyright protection and the claim fails.
Ingrid Innes designs a grid that lists sports statistics using the sole logical arrangement of columns and headings that conveys the data clearly. Imperial Motors reproduces the grid layout in its own reports. Because the expression merges with the idea of presenting those facts, the grid receives no protection and Imperial Motors incurs no liability for copying the structure.
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The doctrine applies when there is only one or so few ways of expressing an idea that protecting the expression would effectively protect the idea itself. Courts therefore withhold protection from the expression in those narrow circumstances.
The doctrine is considered in determining whether actionable infringement has occurred rather than whether a copyright is valid.
Merger is a corollary to the fundamental principle that only the expression of an idea, not the idea itself, is protectable. It extends that principle by denying protection even to expression when limited alternatives exist.
…expression of that idea found in its library. Google also contends that declaring code is not copyrightable because the “merger doctrine” bars copyright protection when there is only one way to express an idea. That argument fails for the same reasons Google’s §102(b) argument fails. Even if the doctrine exists, Google…