Dive summary: 

• The world's largest ad networks have committed to a set of best practices aimed at stopping online piracy by cutting off the flow of ad revenue to rogue sites; the move comes after the White House's push for private entities to adopt anti-piracy policies. 
• Included in the ad networks that committed are Google, Yahoo, 24/7 Media, Adtegrity, AOL, Condé Nast, Microsoft and SpotXchange.
• The best practices are based on the Interactive Advertising Bureau's quality assurance guidelines; the main focus is to prohibit websites that primarily sell counterfeit goods or promote copyright piracy from using an ad network's services. 

From the article: 

"'We believe that this is a positive step and that such efforts can have a significant impact on reducing online piracy and counterfeiting,' Victoria Espinel, the U.S. intellectual property enforcement coordinator, said in a statement. 'We also encourage other participants in the online advertising space to consider adopting voluntary initiatives that protect ad networks, publishers, advertisers, creators, rightsholders, and above all, consumers.'"