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Yes. A good though old (1992) example is Sega vs Accolade.

• curt15 10y ago
  Sega v Accolade, the expression whose copying was deemed "fair use" was actually object code copied en route to discovering the programming interface for the Sega. The interface itself was deemed by the court to be "functional requirements for compatibility with the Genesis console – aspects of Sega’s programs that are not protected by copyright", and which Accolade had a right to access.