The issue is that the only way to guarantee no liability is a clean room implementation. It's why most open source reimplementations require no mention or exami

The issue is that the only way to guarantee no liability is a clean room implementation. It's why most open source reimplementations require no mention or examination of the source/machine code. Google got dinged over a trivial method they copied in their java implementation, even though it was extremely trivial. You can't risk any chance of copying, regardless of how trivial the code.