Maybe DataCAD can offer two sale options, a cheaper softlock price and for those wanting a physical dongle, the current price (or whatever it might be). A third option might be the ability to purchase a 'bundle license' with one of each. For those not having an internet connexion or worried about the reliability of their own service provider (Murphy's Law will have it go down when you have your most important deadline
) then those who take work home can have the dongle at home and the softlock in the office which would likely have the internet connected.