PDMWorks Stand Alone

I am employed with a small company, We recently purchased 2seatsof Solidworks (not pro or enterprise). However we werethinking ofgetting the pro or enterprise because we want to use thePDMfunctions. My question is whether or not I would need topurchasemore SW pro seats for all the people that would use thePDM? Isthere a PDM stand alone version or does it come exclusivelywithSolidworks? There are only 2 engineers here that need tomakethe revisions to models, assemblies, etc. but we have severalotherpeople that would benefit from other relevant information,such asrevision level, where used, etc. These other people wouldalsobenefit on being able to view the files from the vault. Canallthis be done without purchasing additional seats of SW?
Thanks.

AndréSolidworksWorkgroup Pdm