On Thursday, the U.S. Department of Justice announced that it had filed an antitrust lawsuit against Live Nation Entertainment Inc., the parent company of Ticketmaster, alleging that the firm has monopolized the live-entertainment industry, resulting in higher tickets prices and fees for consumers. The federal government was joined by the attorneys general of 29 states and Washington, D.C., in its suit. Here’s what we know about the suit and its prospects in court.