Draftsight License Network or DSLS ?

Hello Draftsight folks,

I`m a DSPartner here on Brazil and I have a doubt about the license methodology.

A customer already have Draftsight free version, but they want to go for the professional version, do they need to use DSLS to get a professional license ? or they can activate the Draftsight using a network license ?

Remember that they are buying this license from us (DSPartner)

Regards,