GWK.GetWindowsProductKeyFromRegistry Method

public static string GetWindowsProductKeyFromRegistry()
 {
     var localKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine,
         Environment.Is64BitOperatingSystem ? RegistryView.Registry64 : RegistryView.Registry32);
     var registryKeyValue = localKey.OpenSubKey(@"SOFTWARE\Microsoft\Windows NT\CurrentVersion")?.GetValue("DigitalProductId");
     if (registryKeyValue == null)
         return "Failed to get DigitalProductId from registry";
     var digitalProductId = (byte[])registryKeyValue;
     localKey.Close();
     var isWin8OrUp = Environment.OSVersion.Version.Major == 6 &&
         Environment.OSVersion.Version.Minor >= 2 ||
         Environment.OSVersion.Version.Major > 6;
     return GetWindowsProductKeyFromDigitalProductId(digitalProductId, isWin8OrUp ? DigitalProductIdVersion.Windows8AndUp : DigitalProductIdVersion.UpToWindows7);
 }