Looking at the Applicability Rules that are in use by WSUS (msus) by looking in the XML files themselves there are many rules that are not documented in the MSDN Doc's or in the XSD files that come with WSUS.
For the most part I have been able to work out how Update Agent works out the rules so far with the exception of LicenseDword, which according to the XML is part of the BaseApplicabilityRules scheme but is not document at all.
It seems to be registry centric but cannot find any of the values in a registry to work out how the rule is getting evaluated.
<upd:ApplicabilityRules> <upd:IsInstalled> <bar:LicenseDword Value="Kernel-ProductInfo" Comparison="EqualTo" Data="30" xmlns:bar="http://schemas.microsoft.com/msus/2002/12/BaseApplicabilityRules" /> </upd:IsInstalled> </upd:ApplicabilityRules>
All the Schema MSDN Documentation is here. The XSD files themselves are only available in the WSUS installation directory under a folder called schemas.
If anyone knows about this rule or knows what they are attempting to evaluated and how it is being done that would be very helpful.