Abstraction-Filtration-Comparison test
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The Abstraction-Filtration-Comparison test (AFC) is a method of identifying substantial similarity for the purposes of applying copyright law. In particular, the AFC test is used to determine whether non-literal elements of a computer program have been copied by comparing the protectable elements of two programs. The AFC test was developed by the United States Court of Appeals for the Second Circuit in 1992 in its opinion for Computer Associates Int. Inc. v. Altai Inc.[1] It has been widely adopted by United States courts and recognized by courts outside the United States as well.