Updating drivers is a sensitive operation. Drivers act as a bridge between your OS and your hardware (GPU, network card, motherboard). Using a cracked version of a driver updater is uniquely dangerous for three reasons:
Let us do the math:
Searching for a "free" license key for typically leads to unreliable or potentially harmful websites. DriverDoc is proprietary software that requires a paid registration (approximately $39.95 USD licence key for driver doc free