Original sentence: Internet product activation, which requires the user to connect to the Internet and type in a serial number so the software can "call home" and notify the manufacturer who has installed the software and where, and prevent other users from installing the software if they attempt to use the same serial number.Some Internet product activation products can allow replacement copies to be issued to registered users or multiple copies to the same license
Edited sentence: Internet product activation, which requires the user to connect to the Internet, or exchange encrypted files with the vendor, so the software can "call home" and notify the manufacturer who has installed the software and where, and prevent other users from installing the software if they attempt to use the same serial number.Some Internet product activation products allow replacement copies to be issued to registered users or multiple copies to the same license