There’s a Californian company known as DC Shoes, making skateboarding fashion gear. Their logo is a D and a C (of course).

Back in 2008, DC Comics decided to sue them for trademark breach of their own logo, which also consists of a D and a C, though they really don’t look anything alike. At least to me.

However, DC Shoes’ lawyers looked into DC Comic’s trademarks and discovered that, despite the fuss when their logo was launched, they’d never actually got around to trademarking it properly.

In fact, DC Shoes discovered they had a case of trademark infringement from DC Comics.

So Warner Bros had to pay a significant sum to continue using the DC Comics logo.