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Re:Supreme Court to Hear Google-Oracle Copyright Fight by wbillingsley on Saturday November 16, 2019 @07:10AM (#21552259)
The EU has similar cases occur. For example between Lego and Best-Lock over what features of lego are copyrightable versus which are functional (and their competitors' minifigures are also designed to "interoperate" with lego bricks)

https://thetmca.com/equitable-estoppel-defense-denies-lego-f...

Re:Supreme Court to Hear Google-Oracle Copyright Fight by sharpneli on Saturday November 16, 2019 @09:54AM (#21552900)
Yeah. As can be seen in that case they are focusing on things that are mandatory (non copyrightable) and those that are just stylistic choices (copyrightable).

API compatibility doesn’t have any stylistic choices in it.