The book and movie also led to the enduring mystery of the identity of Woodward's secret Watergate informant known as Deep Throat, a reference to the title of a popular pornographic movie at the time. Woodward said he would protect Deep Throat's identity until the man died or allowed his name to be revealed. For more than 30 years, only Woodward, Bernstein, and a handful of others knew the informant's identity until it was claimed by his family to "Vanity Fair" magazine to be former Federal Bureau of Investigation Associate Director W. Mark Felt in May 2005. Woodward immediately confirmed the veracity of this claim and subsequently published a book, titled "The Secret Man", that detailed his relationship with Felt.