I have been for a long while reluctant to buy DF license because I don't want to pay yearly fees. However after doing some more research here and calling their customer service I was told that the current license of DF on the website is lifetime and only the upgrades expire after a year. Also I can extend the upgrades every year by $10 which seems fair to me. So now that DF and SD are on similar licensing agreements which one is better? I am planning to run Avira premium with either service.