Short answer:

 It makes our fraud detection more effective and accurate.

Long answer: 

The HTML tracking code allows us to collect a lot more information in addition to what we collect through your AdWords tracking template. This allows us to conduct a more thorough analysis of users and identify more click fraud.

Whilst the HTML tracking code is optional and not required for PPC Protect to function, it is strongly recommended in order to get the most out of the service.

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