Is the 329 minimum tuition fee that does not get refunded if registration is cancelled after first day of classes a per semester minimum or per year minimum?

Considering dropping all courses this semester, but not decided and wanted to understand sure how the $329 minimum charge works. If I drop after the first day of class, it says I will be charged that minimum charge. Is this a minimum charge per semester or per academic year? Because I already paid more than that for the fall semester so they already covered that minimum charge as part of the fall semester tuition. Basically I'm looking at the cost difference between dropping now or Jan 19. I figure no difference because that minimum charge was already paid for as part of the Fall semester fees.