Google’s extending the "Ads by Google" label to “AdWords rich media ads & on standard AdSense ad units” in a way that's unobtrusive to your ad creative and the publisher site, but as user-friendly as current "Ads by Google" notices on other ad formats. You'll soon notice a small 'i' (for "information") icon overlay in the bottom right-hand corner of these ads, which expand when a user hovers over it. This was specially designed for rich media ads. Just like before, users who click on the 'Ads by Google' label will be taken to a page where they can learn more about online advertising and the ads they've just seen.