Microsoft still has not put out the documentation for KB4056446

Usage and Config Patch
5

Looks like the previous poster I found is likely correct, looks like it has to do with smart cards.

Extracting the patch files and finding the manifest, looks like it provides

<assemblyIdentity name="Microsoft-Windows-SmartCardSubsystemClient" version="6.0.6002.24262" processorArchitecture="x86" language="neutral" buildType="release" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS" />

…

  <localization>
    <resources culture="en-US">
      <stringTable>
        <string id="description" value="The Smart Card Subsystem Client." />
        <string id="displayName" value="Smart Card Subsystem Client" />
      </stringTable>
    </resources>
  </localization>
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