It's hijacking the mouse so that it clicks on your own ad You have to be very careful that you don't follow a pattern, have too many clicks, click the ads in a random manner otherwise the folk at Adsense who are, lets face it, much smarter than you will be able to tell and you'll lose your account, face a lifetime ban and not get paid for any valid clicks you have earned. You will then come on here and bleat about how Google is a tyrant and how you've been ripped off but we'll all look back at this thread and mutter "was always going to happen" and turn our backs on you. Now, if you want to learn how to earn in a way that doesn't steal money from the pockets of advertisers then you are in the right place. Read, ask questions, join discussions. You can succeed without being a thief.
I saw some scritp can control this issue,.. display some time for some specific ip, control how many click, etc..
If you were paying to advertise your sites via Google and you ended up paying for 100 clicks that were "clickjacked" so the publisher could profit, would you be alright with that?
Google actually developed a really awesome clickjacking script. It works great and has many rich features. It's invitation only, so you need to contact them and ask for it. Be sure to give them your email address, publishers ID and site URL when submitting your request