Setting your Clixtell account to an aggressive security mode will activate a smart algorithm that will vigorously block broad IP ranges that drove clicks to the sponsored ad.
This security definition is created to be used in the case of a massive attack on sponsored campaigns. It will block attackers from performing illegal clicks on your google ads account by identifying broad IP ranges from service providers creating the attacks and blocking them in an efficient and quick manner.
Please notice you must operate the aggressive security mode/defense mode for a short term only in order to avoid a negative effect on the legitimate traffic of your account.