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{{Intellectual property}}
'''Structure, sequence and organization''' ('''SSO''') is a term used in the United States to define a basis for comparing one software work to another in order to determine if copying has occurred that infringes on copyright, even when the second work is not a literal copy of the first.
The term was introduced in the case of ''Whelan v. Jaslow'' in 1986.{{sfn|Kappel|1991|p=699}}
The method of comparing the SSO of two software products has since evolved in attempts to avoid the extremes of over-protection and under-protection, both of which are considered to discourage innovation.{{sfn|Abramson|2001|p=57}}
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