I know that for many years, C# was proprietary, and it's always been focused on Windows. Then I started hearing about Microsoft releasing component after component of the language's framework as open-source. For many years Wikipedia said that the Common Language Runtime was proprietary, but now it's open source too.How much of the language is open source now? Are there any necessary proprietary components? Could I bootstrap it given all the code that Microsoft has released? How do Microsoft's patents factor in?
How much of the C# programming language is open source?
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