Follow below steps to get Free Comodo Internet Security Pro 2012 one year license key.
-Download Comodo Internet Security Pro 2011 Here
-Install and start Comodo 2011. Navigate to “More” -> “About” -> Serial Number -> “Copy”.
-Save the serial number on your PC, you will need this serial to activate the 2012 version.
-Download and Install Free Comodo Internet Security Pro 2012
During installation, enter the serial number that you received from the 2011 version.
Note: The installer will connect to the internet and automatically activate your subscription
for 1 year (365 days).
Credits: My friend Ankit