Eric, when you purchased WSM in the past, you got a use right for the software which ends as specified in the license file.  Software maintenance provides access to the latest and greatest version while maintenance is active and was sold seperately. When maintenance is inactive, you can still use the Software because you own it. WSM was only sold with one year maintenance, with the Option to extend it to up to three years at the time of purchase, or renewing maintenance before moving to inactive state. If you don't have active WSM maintenance, the license Swap program is not applicable. However, you can renew your maintenance by purchasing vWorkspace Permier Edition per Access Device (which includes one year maintenance and is perpetual too). 
CDW today told me that my order from a week ago for WSM licenses was cancelled due to those licenses being discontinued and are now absorbed into the vWorkspace line.  My rep said there isn't a clear cut way for him to sell me vWorkspace licenses yet, but he is looking to see if it is possible. I pretty desperately wanted these licenses for an expansion here, have the boxes, the users starting soon - but no licensure to make this happen. I use WSM 6.0, what are we supposed to do for licenses?  Anyone know?   Eric
WSM license purchasing vs Vworkspace