Christian Louboutin gets to click his red-soled heels together in victory.
A U.S. federal appeals court ruled today that the famous French luxury shoe designer was entitled to trademark protection of its signature fire-engine red soles, with certain limitations.
The 2nd U.S. Circuit Court of Appeals in Manhattan ruled that Louboutin was allowed to protect its brand against red-soled shoes produced by Yves Saint Laurent S.A.S., another Paris-based luxury designer, but it instructed the U.S. Patent and Trademark office to limit Louboutin's registration "to uses in which the red outsole contrasts with the color of the rest of the shoe," meaning that if Yves Saint Laurent were to use a red sole on a red shoe, it would not infringe on Louboutin's trademark.
"It is the contrast between the sole and the upper [part of the shoe] that causes the sole to 'pop,' and to distinguish its creator," the appeals court wrote.
This decision overturned a district court judge ruling last year that went against Louboutin, saying that one color could never serve as a fashion brand trademark, even though the U.S. Patent and Trademark office had granted Louboutin protection in 2008.
In response to the court ruling, Louboutin told ABC News in a statement that they were "extremely pleased and gratified that the Appellate Court found our key arguments to be correct: first that color can and does serve as a trademark in the fashion industry, and that Christian Louboutin's world famous Red Sole trademark is valid, protectable and enforceable."
"As we have said throughout these proceedings and we reiterate now, especially in the light of this decision, we will continue to take all steps available to protect our trademark," the statement said.
Attorney David H. Bernstein, who represented Yves Saint Laurent, told the Associated Press that the ruling was "a total victory for us," since the company would be able to continue making all-red shoes.
The court battles over the bright red window into Louboutin's sole arguably put an entire shoe empire at stake.
Louboutin sells more than 650,000 pairs a year, and his shoes don't come cheap. The sexy, sky-high heels can sell for $495 and up -- with a crystal-encrusted pair costing $6,000. They have been seen on the feet of many of Hollywood's elite, including Angelina Jolie, Scarlett Johannson and Jennifer Lopez (who has a song about the shoes called "Louboutins"). Even Barbie dolls have their own custom mini-sized Louboutins.
The signature red sole had become a beacon of high-fashion and the demand is great. Just last month, U.S. Customs and Border Protection confiscated 20,457 pairs of counterfeit Christian Louboutin shoes at the Los Angeles/Long Beach seaport.
"Nightline" caught up with Christian Louboutin at his Paris atelier in November 2011, as the designer was celebrating his line's 20th anniversary while the legal battle raged over his right to keep his identity as the red sole man.
"Well, you know, it's, to be copied can be sort of taken as a compliment, but when it's to be really attacked, in a way... then I do not see it as a compliment," Louboutin said at the time.
YSL's lawyers had previously argued that using the red sole for its shoes was not trademark infringement because "no designer should monopolize a color."
Louboutin rejected the Saint Laurent argument.