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Windows Games’ Compatibility on Linux Is at an All-Time High
(boilingsteam.com)
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Rules:
They likely have patents on a number of things implemented in Wine/Proton. Clean-room implementation is also good, buy would cover copyright, not patent.
WINE stands for “WINE Is Not an Emulator”; they’re not reimplementing Microsoft libraries. No patents to violate.
That's not how it works, but ok