You are probably referring to our Acceptable Ads program.
In this program, websites are permited to show certain ads on the page. However, those ads have to be produced according to a series of criterias (ie. not animated, non-intrusive, cannot block content, etc). Websites have to apply join the program and are judged by a committee. This ensures that all pages follow the criteria established.
User can chose to opt-out from seeing Acceptable Ads at any time in their ABP settings.
