Konica Minolta Return Program cartridges
(UAR) are patented print cartridges sold at a
discount in exchange for the customer's
agreement to the license requirements that the
cartridges will be used only once and returned
only to manufacturer for remanufacturing or
recycling. These patented cartridges are
licensed for single use only and will stop working
after delivering a fixed amount of toner. Toner
may remain in the cartridge when replacement is
required. Standard replacement cartridges
(STD) are sold without these restrictions.

If the customer puts a UAR in it will halt at 60K, A STD will continue indef. (IUP20-UAR, IUP21-STD)

This applied to a wide range of these smaller desktop printers/MFPs and can apply to both toner and IUs