Tom Scharfeld has seen off a challenge by the President’s legal team to naming his trumpet-teaching app, iTrump.

Tom Scharfeld, a San Francisco-based trombonist, has won his six-year battle with lawyers for the 45th President of the United States who objected to his using the name iTrump for a music education tool. As a result of the protracted dispute, Scharfeld has additionally forced Trump to cancel or withdraw some of his previous trademark registrations which were found to have not been used in a “relevant” context, according to a report on the Time Inc. website.

A lifelong jazz musician, Scharfeld designed his $2.99 iPhone app, which adopts an intuitive simulation approach to teach users to play trumpet, along with another called iBone, which does the same for the trombone, and filed the name back in 2010. A month later he received an intimidating letter from lawyers representing Donald Trump maintaining that his use of the name was detrimental to the quality of the Trump mark and would tarnish “the goodwill and reputation that Mr. Trump has built over the years”.

A lengthy David and Goliath scenario ensued, which saw Trump’s legal team defending a name that has been applied in...