This. This seems to be the argument that Nintendo is hinging on. In order for Yuzu to play the games properly you need a prod.keys file. I guess Nintendo is claiming that the keys in this file are owned by them and it’s illegal to have that number much in the same way the number used to represent the C code for decoding DVD copy protection is illegal: https://en.m.wikipedia.org/wiki/Illegal_number#Illegal_primes

I am no lawyer but seems tenuous when you can run a program to get the prod.keys from your own console. Especially when that code is legal and exists on GitHub: https://github.com/Decscots/Lockpick_RCM