This figure shows two screenshots of popup windows asking for the user to verify updates to their computer. These screenshots illustrate how the digital signature of the origin of the software update is verified before installation. The first screenshot demonstrates an update from an unverified publisher, with the popup window asking ‘Do you want to allow the following program from an unknown publisher to make changes to this computer?’ It then lists these details: ‘Program name: MMSSETUP.EXE’, ‘Publisher: Unknown’, ‘File origin: Network drive’. The second screenshot demonstrates an update from a verified publisher, with the popup window asking ‘Do you want to allow the following program to make changes to this computer?’ It then lists these details: ‘Program name: Microsoft Setup Bootstrapper’, ‘Verified publisher: Microsoft Corporation’, ‘File origin: Network drive’.