Tesco has said it intends to appeal after Lidl scored a victory in a High Court fight over the use of a yellow circle logo.
A judge said on Wednesday that she had found for the German discount supermarket on claims of trademark infringement, passing off and copyright infringement.
Mrs Justice Joanna Smith oversaw a hearing at the High Court in London earlier this year.
Lidl uses a yellow circle in its main logo while Tesco uses a yellow circle logo to promote a Clubcard scheme.
A Tesco spokeswoman said: “We are surprised and disappointed by the decision today in relation to the claim brought by Lidl against our Clubcard Prices logo.”
She added: “We intend to appeal.”
Mrs Justice Smith said Lidl had made allegations of infringement of registered trademark rights in “Lidl’s logo devices”, passing off and infringement of copyright.
She said Lidl’s complaint concerned what it described as the “use by Tesco of an identifier for its Clubcard Prices promotion”.
“Essentially, Lidl says that Tesco is seeking deliberately to ride on the coat tails of Lidl’s reputation as a ‘discounter’ supermarket known for the provision of value,” said the judge.
“It is Lidl’s case that the Clubcard Prices promotion was adopted by Tesco as part of a campaign that was designed to improve Tesco’s ability to compete with discounter supermarkets such as Lidl.”
She added: “Lidl contends that the deception of Tesco’s customers is not accidental.”
Mrs Justice Smith said she had found for Lidl on claims of trademark infringement, passing off and copyright infringement.
Tesco had counterclaimed and the judge said she had made a finding in favour of Tesco on its counterclaim.
The judge said: “Tesco pursue a counterclaim alleging that some of the Lidl trademarks are liable to be declared invalid on the grounds that they were registered in bad faith, and/or that they should be revoked for non-use and/or that they have no distinctive character.”
She said she had found in favour of Tesco on its “counterclaim of bad faith”.
The judge said there had been “no deliberate intention positively to evoke Lidl”.
But she said that did not mean the design “was not copied with the focus being on the message that a blue and yellow background would convey for the Clubcard campaign”.
She said Lidl had relied upon its “trademark rights” in relation to a logo which included the word “Lidl” and a logo without that word.
Tesco had counterclaimed and alleged that “some of the Lidl trademarks” were liable to be declared invalid on the grounds that they were “registered in bad faith”, or “should be revoked for non-use and/or that they have no distinctive character”.
She said that was “sufficient to amount to bad faith”.
A Lidl spokesman said: “We asked Tesco to change their Clubcard logo, but they refused, making it necessary to bring this case.
“Having seen the evidence, the court has now ruled that Tesco’s Clubcard logo was copied from Lidl’s logo, and it infringes Lidl’s trademark rights and copyright.”
He went on: “We are pleased that the court has agreed with us.”
A Tesco spokeswoman added: “This claim brought by Lidl was just about the colour and shape of the Clubcard Prices logo. The judge’s ruling concluded that there was no deliberate intent on Tesco’s part to copy Lidl’s trademark.
“It has no impact on our Clubcard Prices scheme, which we will continue to run in exactly the same way.”