Warner Bros Entertainment (Warner Bros.) is inextricably linked with the uber-successful Harry Potter franchise thanks to producing all eight movies. However, when they attempted to trade mark a famous phrase used in the Harry Potter universe, they were denied by the US Patent and Trademark Office (USPTO).
Documents revealed by The Blast in March 2019 show that the USPTO has refused multiple trade marks to Warner Bros. for the phrase: “I solemnly swear I’m up to no good.” Here’s why.