Knock Knock : Who is there ?
Virus : This is a virus trying to attack the system you are trying to defend McaFee!

McaFee : Hello Nah! This is my paid customer I wouldn't let you attack their system in any way.

Virus : But I'm just born yesterday and you don't have the patch needed to keep me away.Looks like your customer hasn't downloaded them yet.Make way please..

McaFee: Ohh wait a second. "Keep Updated with the latest security features,buy our tokens to get the latest path for new viruses"