Understanding Google's 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 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: The Pros

1. It'd be easier to find rare and out-of-print books.