There will be a renewal required (for all Kickstarter backers, it will be $20/year for the regular FixMeSticks and $100/year for the Pros) to continue using the FixMeStick. The reason for the ongoing feeis that there is an ongoing cost for the latest virus definitions which get automatically downloaded onto the FixMeStick each time it runs. Since viruses change so quickly (by the minute), the FixMeStick wouldn't be very effective without these updates.
Renewal will be painless- no need to send the FixMeStick back to us or anything. The FixMeStick will realize it is expired and will prompt for a credit card number, Simple as that.