Pop star Katy Perry wins appeal in trademark battle against Sydney fashion label Katie Perry

• Pop star Katy Perry has won an appeal in a long-running trademark dispute with a Sydney fashion designer bearing a similar name
• A string of legal action was first launched in June 2009 over a trademark held by Katie Jane Taylor, who uses her birth name to design and sell clothes under the brand Katie Perry
• Taylor's 'Katie Perry' trademark will be cancelled unless she applies for special leave to appeal to the High Court and she has been ordered to pay costs

Pop star Katy Perry has had a big court win in a long-running trademark dispute with a Sydney fashion designer bearing a similar name.

The American singer has successfully appealed a Federal Court ruling from 2023 over use of the homophonous name and found she had breached copyright on a number of occasions by using the trademark.

A string of legal action was first launched in June 2009 over a trademark held by Katie Jane Taylor, who uses her birth name to design and sell clothes under the brand Katie Perry.

The court initially found in Taylor's favour, citing trademark infringements during Perry's 2014 and 2015 Prismatic Tour in Australia, at pop-up stores in Sydney and Melbourne during that tour, and on a website for merchandise company Bravado.

However in a decision in Sydney on Friday, Federal Court found on appeal the trademark must be cancelled, in part because the name was globally synonymous with the 'I Kissed A Girl' singer when it was trademarked and ongoing use may "deceive" and "cause confusion".

Taylor said she was "devastated" by the judgment and had "lost everything".

"It is a David and Goliath fight," she said.

"And Goliath won."

She is covered by litigation funding from Litigation Capital Management for court costs but will have to pay out of pocket to re-brand her business.

She said the Australian legal system had let her down.

"My intention has always been about standing up, and I think it shouldn't matter whether or not you're a pop star or you're a small business - we all matter," she said.

"This has taken a huge toll on me and on my family."

Court finds Perry was already a globally recognised name

The court heard the singer Perry, whose real name is Katheryn Elizabeth Hudson, "honestly adopted" the Katy Perry moniker in 2002, some five years prior to Taylor starting her own label.

In the original judgment, the court found Perry did not have a big enough reputation before the label was established to deceive or cause confusion for the public.

The judge laid out a number of reasons including the difference in spelling of "Katy" versus "Katie" which differentiated the trademarks, and that her name at the time only extended to music, and "had no reputation in clothing".

But Justices David Yates, Stephen Burley and Helen Rofe found the reputation in the trademark to music and entertainment "overlooked relevant evidence".

"In concluding that the Katy Perry Mark did not have a reputation in clothes, the primary judge ignored the common practice of pop stars to sell merchandise including clothing at concerts and to launch their own clothing labels," they said.

"Whilst some die-hard fans of Ms Hudson may recognise the incorrect spelling, the ordinary consumer with an imperfect recollection of the Katy Perry Mark confronted with a garment with Ms Taylor's Mark on it would be likely to be confused as to the source of the item and wonder whether it was associated with Ms Hudson."

Definition of 'clothing' disputed

Taylor also failed in her challenge to have the definition of the trademark infringement expanded to include hats and shoes.

In the initial judgment, the court found some of the items sold on the Katy Perry tour did not breach trademark infringement because some of the offending items did not fall in to the definition of "clothes".

Taylor challenged the definition to extend to "headgear, caps, hats and headbands" and appealed the court's ruling that clothes does not include shoes and headwear.

She told the court that if a person commanded her to "take off your clothes" would "naturally assume that this included all items of clothing".

However, the court found that because Taylor did not explicitly nominate headgear and footwear in her trademark, "there is no warrant for construing the word 'clothes' more broadly now".

Peaceful co-existence 'no longer possible'

The court outlined a proposed co-existence agreement drawn up by Perry and presented to Taylor in 2009, which would have allowed them both to trade under their respective brands.

Taylor rejected the proposal.

"The absence of any actual confusion over the many years of co-existence suggests that there has been no confusion on the part of consumers," court documents said.

Having rejected the offer, Taylor commenced infringement proceedings against Perry and the businesses associated with her brand.

In the latest decision, the justices said in that sense Taylor had "brought this result on herself".

"Unfortunately, it is no longer possible to return to the time of peaceful co-existence," they said.

Taylor's 'Katie Perry' trademark will be cancelled unless she applies for special leave to appeal to the High Court.

The court also ordered her to pay Perry's costs for the appeal and cross-appeal.

-This story was originally published by ABC News.