Here in the USA, subscription maintenance is required for Enterprise PDM and has been since day #1, as far as I know.
I believe that SolidWorks has to pay Microsoft a fee for every seat sold for the use of the Microsoft SQL server.
For example, to purchase 2008 SQL Server, 10 seat, retail price is $1,739.00 USD and a single client seat is $161.00 USD. SolidWorks includes SQL server with EPDM.
Perhaps this is why subscription maintenance is required.
Thank you Devon.
I thought that is the same thing as for SolidWorks licence where we can buy without subscription service.