The CBS TV network has launched a legal appeal to have its $550,000 (£295,000) fine for Janet Jackson's 2004 Super Bowl breast exposure overturned.
Jackson's exposed breast was seen by around 90 million viewers
In a petition for review filed in the 3rd US Circuit Court of Appeals in Philadelphia, the network said the fine was "unconstitutional" and "arbitrary".
The Federal Communications Commission (FCC) said it would defend the fine.
Jackson exposed her right breast during a dance routine with Justin Timberlake during the Super Bowl's halftime show.
The incident, which Timberlake famously blamed on a "wardrobe malfunction", provoked more than 540,000 complaints.
CBS said it had apologised for the "inappropriate and unexpected" episode and had implemented safeguards to prevent similar broadcasts.
Timberlake blamed the incident on a "wardrobe malfunction"
"We disagree strongly with the FCC's conclusions and will continue to pursue all remedies necessary to affirm our legal rights."
Since the Super Bowl incident, American broadcasters have been under increasing pressure to clean up the airwaves.
Last month, US President George Bush signed a law increasing the maximum fine for airing unsuitable material to $325,000 (£174,000).
In a statement, the FCC said CBS was "out of touch with the American people".