Sesame Street Lawyers up in Trademark Lawsuit

The new Melissa McCarthy movie "The Happytime Murders" has been described in the press as "an R-rated buddy-cop movie set in a world where humans and Sesame Street-style puppets co-exist." In the movie, McCarthy is teamed up with one of the puppets as her new police-partner and one could imagine a pretty entertaining script & plot follows. 

So what's the inspiration for Sesame Street to lawyer up against this movie? This:

Sesame Street's owners are claiming that this advertisement is unfairly infringing on the Sesame Street Trademark. Read more about the controversy here.