The Department of Justice is now looking into Google’s proposed settlement over its Book Search service, sources tell both The New York Times and The Wall Street Journal . The inquiry is said to be focused on antitrust concerns surrounding the online book deal.

The Book Search settlement, announced in October, followed a three-year battle over Google’s right to display copyrighted books on its Web site. The Authors Guild and the Association of American Publishers claimed Google was violating copyrights by doing so. Google eventually agreed to pay $125 million to ensure authors and publishers could register to receive payments anytime their books were viewed within the service.

The deal is proving to be quite divisive, and now, with the Justice Department’s reported antitrust investigation, things could get even more dicey. Here’s a look at five key arguments from both sides of the debate.

Google’s Book Search Deal

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