New Delhi, Dec. 11 -- Millions of people who bought concert tickets through Ticketmaster are one step closer to proceeding as a class in a major antitrust lawsuit against Live Nation Entertainment and its Ticketmaster subsidiary. The plaintiffs say the company used its overwhelming market power to inflate ticket prices and impose excessive fees.

The case is before US District Judge George Wu in Los Angeles, who on Thursday took the motion for class certification under submission - a crucial step that could determine whether the lawsuit moves forward on behalf of millions of consumers.

If Judge Wu certifies the class, Ticketmaster and Live Nation could face billions of dollars in potential liability. Under federal antitrust laws, damages...