The European Union General Court on Wednesday annulled a $1.7 billion antitrust penalty levied by the European Commission against Google over its AdSens

As the government wraps up its case, it has built a picture of how Google has become dominant among companies that buy and sell ads online.

Google has opened its defense against allegations that it holds an illegal monopoly on online advertising technology with witness testimony saying the industry is vastly more complex and competitive than portrayed by the federal government.