If you are running Adsense on any of your sites, you likely recently agreed to some new terms and conditions. And for most, I'll bet you didn't actually read through all those terms and conditions, now did you?
One change in particular warrants a little of your attention that I imagine the vast majority of sites are in violation of:
If you'd like a copy: Save & rename this file to privacy.php. After all, no need to risk your Adsense account over something that can be remedied this easily!