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If only anyone been able to establish this as a credible defense in court.

"This is my IP" is an absolutely valid defense in court. There have been tens of thousands of trials with IP infringement at its core.

https://en.wikipedia.org/wiki/List_of_copyright_case_law

https://en.wikipedia.org/wiki/List_of_patent_case_law

https://en.wikipedia.org/wiki/List_of_trademark_case_law

https://en.wikipedia.org/wiki/List_of_United_States_patent_l...

https://en.wikipedia.org/wiki/List_of_United_States_Supreme_...

Did you not know this?

Are you aware of a case where the practice of emulation has ever been found, in court, to be a case of IP infringement? Because that's actually the pertinent claim here, not that IP infringement is a real thing that exists.

I think they meant about emulation.

I believe emulation is legal in the US.

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