Google AdSense Program Policies Part 2

Site Behavior
Sites showing Google ads should be easy for users to navigate. Sites may not change user preferences, redirect users to unwanted websites, initiate downloads, include malware or contain pop-ups or pop-unders that interfere with site navigation.

Competitive Ads and Services
In order to prevent user confusion, publishers may not display Google ads or search boxes on websites that also contain other ads or services formatted to use the same layout and colours as the Google ads or search boxes on that site. Although you may sell ads directly on your site, it is your responsibility to ensure that these ads cannot be confused with Google ads.

Google Advertising Cookies
AdSense publishers must have and abide by a privacy policy that discloses that third parties may be placing and reading cookies on your users' browsers, or using web beacons to collect information as a result of ad serving on your website.
Google uses the DoubleClick DART cookie on publisher websites displaying AdSense for content ads. Subject to any applicable laws, rules and regulations, you will have the sole and exclusive right to use all data derived from your use of the DoubleClick DART cookie for any purpose related to your business, provided that Google may use and disclose this data subject to the terms of Google's advertising privacy policies and any applicable laws, rules and regulations.

If your current advertising services contract with Google or DoubleClick already has a specific provision defining data ownership, that provision instead of this policy will govern with regard to the data collected under that contract.

Product-Specific Policies

AdSense for content: Up to three ad units and three link units may be placed on each page.

AdSense for search: A maximum of two Google AdSense for search boxes may be placed per page. Also, a single link unit or a search box, but no other Google ads, may be placed on pages with AdSense for search results. Queries must originate from users inputting data directly into the search box and cannot be modified. This includes pre-populating the search box with terms or hard-coding direct links to search results pages. AdSense for search code may not be integrated into any software application such as a toolbar.

Additional Products:
AdSense for mobile
AdSense for video
AdSense for feeds
AdSense for domains

Source: AdSense Help

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