Google AdSense uses what is called a DoubleClick Cookie. A DoubleClick cookie is a cookie that gets placed on a user’s device when the user clicks on an ad on a partner’s website.
Google requires all websites and mobile apps that use AdSense to inform visitors and users of Google’s DoubleClick cookie usage.
- Google’s use of the DoubleClick cookie enables it and its partners to serve ads to your users based on their visit to your sites and/or other sites on the internet
Google doesn’t give specific guidelines beyond the above points because laws vary, but so long as the above points are made, your legal agreement should be adequate to satisfy Google’s requirements at least.