A 45 year old organisation that supports the TT has been told it can't use the logo - because the Department of Economic Development has trademarked it.
The TT Supporters Club is the latest organisation to be banned from using the initials on goods it sells to raise money.
The club was set up in 1972, and donates cash to help riders taking part in the festival each year.
Now, however, the DED says it won't be able to use the TT logo on its fundraising shirts, coats and badges.
Pete Oulton from the club announced the news on Twitter yesterday.
He says once the remaining merchandise has been sold, the club will have to find new designs that doesn't use the logo.
Previously, Ramsey Commissioners, the RNLI and Bushy's Brewery have all fallen foul of the government's trademark - prompting the DED to change the way it charges for licenses.
Mr Oulton says there's a meeting today with DED to discuss the situation, and he can't comment on the negotiations.
It's official we can't use the TT logo on our goods anymore,so working on new designs once we sell out of this stockhttps://t.co/RmW5A63shZ
— TTSC WEBSITE (Pete) (@ttscwebsite) June 14, 2017
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