Hedge fund Elliott Management Corp. is financing a high-stakes patent lawsuit against Quibi, the new streaming service founded by entertainment veteran Jeffrey Katzenberg, according to people familiar with the situation, putting power players of Wall Street and Hollywood on a collision course.

Elliott has agreed to fund a suit brought by interactive-video company Eko, which claims Quibi is violating its patents and has stolen trade secrets, the people said. As part of the financing, Elliott would end up with an equity stake,…

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