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Concept.png Windows 
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A closed source operating system.

Microsoft Windows is a widely used closed source operating system.

Windows NT

In August 1999 Andrew D. Fernandes of Cryptonym Corporation discovered a variable in Windows NT 4 Service Pack 5 (which had been released unstripped of its symbolic debugging data) entitled "_NSAKEY". Microsoft stated that this was "simply an unfortunate name" connected to NSA export control and denied that it was a backdoor for the NSA.[1]

Windows 10