Abstract: A security system and method for the application at a self-service or financial terminal is disclosed. This system comprises at least: a peripheral device (2); a storage unit (3) capable of storing a firmware for upgrade in the peripheral device (2); and a processing unit (4) operatively associated with the storage unit (3), wherein the processing unit (4) is configured to block firmware upgrade saving in the peripheral device (2) when the firmware is not authentic.

Abstract: The present invention refers to self-service sales counters used in commercial establishments that allow the customers themselves to check out their purchases and make the corresponding payment without requiring the intervention of an attendant, said sales counters comprising a first (20) and a second (30) self-checkout stations, placed in parallel to one another along a full-length partition (61), said sales counters comprising a first commercial automation module (63) associated to the first self-checkout station (20), a second commercial automation module (64) associated to the second self-checkout station (30) and a banking automation module (65) shared by both stations, wherein the control of each of said modules is performed by a specific independent program.