Street artist Banksy has lost a legal battle with a greeting card company along with a European Union trademark for his famous work Flower Thrower.

The cancellation division of the EU's intellectual property office said in a ruling this week that Banksy's trademark for Flower Thrower was filed in bad faith and declared it "invalid in its entirety".

Also known as Love is in The Air, the graffiti artist created the work in Jerusalem in 2005.

It depicts a young protester wearing a cap and with his face half-covered throwing a bouquet of flowers.

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The decision, which can be appealed, followed a dispute between UK greeting card company Full Colour Black Ltd and the company that authenticates and handles requests dealing with Banksy's work, Pest Control Office Ltd.

Full Colour Black, which sells products printed with images of his pieces, claimed the 2014 trademark for Flower Thrower should be cancelled because Banksy had not made use of it.

Bucks Free Press:

Bansky graffiti in Bethlehem. Credit: ZaBanker - Own work. CC BY-SA 4.0

The company argued he only applied for it to prevent "the ongoing use of the work which he had already permitted to be reproduced".

The greeting card company also noted Banksy wrote in one of his books that "copyright is for losers".

After Full Colour Black started legal proceedings, Banksy opened an online store called Gross Domestic Product to sell his own range of merchandise.

But the move left the EU examiners unconvinced.

They wrote in their decision: "It was only during the course of the present proceedings that Banksy started to sell goods but specifically stated that they were only being sold to overcome non-use for trademark proceedings and not to commercialise the goods."

Citing Banksy's stated contempt for intellectual property rights, the examiners also made clear the artist's choice to keep his identity secret hurt him in the Flower Thrower case.

They wrote: "It must be pointed out that another factor worthy of consideration is that he cannot be identified as the unquestionable owner of such works as his identity is hidden.

"It further cannot be established without question that the artist holds any copyrights to a graffiti.

"The contested (trademark) was filed in order for Banksy to have legal rights over the sign as he could not rely on copyright rights but that is not a function of a trademark."

Bucks Free Press: Banksy homeware store launch - Credit: PABanksy homeware store launch - Credit: PA

Aaron Wood, trademark attorney at Blaser Mills Law, which has offices on Oxford Road in High Wycombe, represented the greeting cards company in the two year dispute with Banksy.

Speaking following the ruling, Mr Wood said: “The decision is a significant one for the art industry, and particularly for Banksy. A trademark in the name of his company meant he could potentially sue despite making it clear in the past that he had disdain for intellectual property.

“It is a big blow to Banksy, who has been trying to get trademarks around the world for his artworks and means all of his trademarks are now as risk, as his entire portfolio has the same issue.

“Our client is ecstatic with the win – it has been a long time coming. Unlike Banksy’s work, this masterpiece didn’t just arrive overnight.”