By using ClickReport's Click Fraud Deterrant, people who wish to abuse your pay per click ads will recognize you are actively monitoring their click behavior. This has shown to reduce the overall number of repeat clickers for advertisers.
<a href="https://www.clickreport.com/?crtag=sitelink" border="0">
<img border="0" alt="Deter Click Fraud" src="https://www.clickreport.com/badge-image">
</a>
<a href="https://www.clickreport.com/?crtag=sitelink" border="0">
<img border="0" alt="Deter Click Fraud" src="https://www.clickreport.com/badge-image">
</a>
Placing the code in your landing page will display the image seen below: