If your Cubase 7 license is already on a USB-eLicenser (dongle) , it will continue to work as long as the physical dongle is plugged in and functional. How to Legally Access Cubase Today
Cubase 7 activation codes are tied to a specific purchase or hardware bundle. cubase 7 activation code list
If your license was stored on a "Soft-eLicenser" (your computer's hard drive) and you reinstall your OS or change computers, that license is lost forever. It can no longer be reactivated. If your Cubase 7 license is already on