After you enter the license or sales number into AVG during
installation or activation and it is accepted, your AVG is correctly
licensed. The number you used for activation is however never shown
complete anywhere in AVG - the last group of four characters is hidden.
This is due to security reasons, to prevent an unauthorized person to
use your license just by writing it down from your AVG program.
If you need to reinstall AVG, or you are installing e.g. AVG Internet
Security 3-pack edition on all three computers, it is needed to always
enter the full license number that was provided to you upon purchase or
registration. The short license number taken directly from AVG will not
be accepted.
The short license number is on the other hand sufficient for your
authentication when contacting our Technical or Sales Support, and for
any common tasks related to your product.