 However, having initially signed away control over merchandising in his initial contract with the syndicate, Watterson would commence a lengthy and emotionally draining battle with Universal to gain control over his work.Ultimately Universal did not approve any products against Watterson's wishes, understanding that unlike other comic strips, it would be near impossible to separate the creator from the strip if Watterson chose to walk away.One estimate places the value of licensing revenue forgone by Watterson at $300–$400 million.