So what exactly did Willingham own of Fables? Like, does this mean the books themselves are now free of copyright? Or is it a matter of owning the characters

So what exactly did Willingham own of Fables? Like, does this mean the books themselves are now free of copyright? Or is it a matter of owning the characters for derivative works? Edit: his follow-up post says he signed away publishing and adaptation rights to DC... isn't that.... all of the rights?