First of all, the MS URP1 IS in fact included in the USPs. So are the fixes for the problems that it introduces.
However, Microsoft chose to add a new kernel mode (!!) driver to W2K in the MS URP1. This file system filter driver has never been part on W2K in the first place. Its main purpose is to intercept file access on behalf of DRM systems, although it can be (ab)used for just about any purpose. My opinion is, that introducing a new kernel mode driver less than 3 DAYS before mainstream support is ended is a very bad idea, so I've chosen not to include it in the USPs. WUv6 detects that this filter driver is not present on your system, and that is exactly why MS URP1 shows up. I've deliberately chosen not to attempt to suppress the MSURP1 on WU, because I think you should have the option to install this filter driver if you want it.
Hope that explains stuff - maybe I'll include it in USP 5.1 and just leave it disabled by default - donno.
G
