Workgroup PDM Server 2009 Licensing Changed?

I'm confused on the Workgroup PDM Server product licensing.I'm seeing confilicting information, and am looking forclarification.

I currently own SW Standard licensing. I am able to install valultadmin in 2009 with this license. What do I need to be able to fullydeploy the Workgroup server, and get my eng department fully usingthe workgroup pdm package? Did they change the pro+ requirementswhen 2009 was released?

I currently have the need for 6 seats of PDM, all currently are SWstandard.

Thanks in advance.SolidworksWorkgroup Pdm