Rockers Live have filed a court injunction against former frontman Ed Kowalcyzk over the use of the band name.
Bosses at the group's management team, Action Front Unlimited, have accused the singer, who left the four-piece in 2009, of misleading fans by performing under the banner Ed Kowalcyzk of Live, and releasing a solo album titled Alive.
Executives are now asking a New York federal judge to ban the vocalist from using the name and award Live's remaining members - Chad Taylor, Patrick Dahlheimer, Chad Gracey, and Chris Shinn - $2 million (£1.25 million) in damages for trademark infringement.
Many ticket-holders couldn't get into the O2 Arena show on Tuesday night (September 19th) because they didn't bring photo ID to match their booking.
An album re-release, a new song and a documentary mark the singer's legacy this year.
The actor plays the titular hero in the forthcoming adaptation.