First, we must understand the physical object being virtualized: the , often produced by companies like HASP (Aladdin), Sentinel (SafeNet), or CodeMeter (Wibu-Systems). A hardware key, or dongle, is a physical USB device that contains a unique, encrypted serial number or cryptographic chip. High-end engineering software (like CAD/CAM packages, CNC controllers, medical imaging tools, or professional audio software) uses these dongles for software protection . The software will run only if the dongle is plugged into the computer. This prevents unauthorized copying and sharing.