Apparati, methods, and computer-readable media for preventing unauthorized installs and uninstalls of software modules on a computer. One method embodiment of the present invention comprises the steps of amending (41) an uninstall instructions file (32) to include an invention attribute (33) and at least one pre-selected uninstall condition (34); detecting (42) an attempt to open said uninstall instructions file (32); checking (43) the uninstall instructions file (32) for presence of said invention attribute (33); determining (45) whether the at least one condition (34) is satisfied; and aborting (46) the uninstall when at least one condition (34) is not satisfied.