What is the DoubleClick DART cookie?
The DoubleClick DART cookie is used by Google in the ads served on publisher websites displaying AdSense for content ads. When users visit an AdSense publisher's website and either view or click on an ad, a cookie may be dropped on that end user's browser. The data gathered from these cookies will be used to help AdSense publishers better serve and manage the ads on their site(s) and across the web.

What should I put in my privacy policy?
Your posted privacy policy should include the following information about Google and the DoubleClick DART cookie:

• Google, as a third party vendor, uses cookies to serve ads on your site.
• Google's use of the DART cookie enables it to serve ads to your users based on their visit to your sites and other sites on the Internet.
• Users may opt out of the use of the DART cookie by visiting the Google ad and content network privacy policy.

Because publisher sites and laws across countries vary, we're unable to suggest specific privacy policy language. However, you may wish to review resources such as the Network Advertising Initiative, or NAI, which suggests the following language for data collection of non-personally identifying information:
We use third-party advertising companies to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you. If you would like more information about this practice and to know your choices about not having this information used by these companies, click here.
You can find additional information in Appendix A of the NAI Self-Regulatory principles for publishers (PDF). Please note that the NAI may change this sample language at any time.