Thank you both.
I was asking about the compare between the Free Antivirus and the Pro Antivirus, not the Internet Security thing...
As I said, the difference seems to be:
*Secures online banking and purchases
*Surfing well-known sites (e.g. Facebook, Twitter)
*Browsing risky sites
*Runs risky programs safely
But what exactly does it mean? Where can I find more info (even technical info) on how exactly it's being done...