Lawyers for former Edwards aide Andrew Young filed a sealed motion to compel Edwards to give them more information. Apparently, they didn't get all the answers they wanted when they deposed him in early February.
Hunter sued Young and his wife for invasion of privacy in an effort to get the tape back last year. She has said she attempted to destroy the video tape by pulling it out of its cassette box before storing it in a box of private belongings.
Young, who has said he helped keep Hunter in hiding for Edwards during the 2008 presidential campaign - and later wrote a book about the experience - contends the tape was found amid trash that Hunter left behind in a home that he was renting.
Hunter worked as a videographer in 2006 for Edwards' political action committee. Edwards initially denied an affair and later denied fathering a child with Hunter. He has since admitted to both.
The sex tape dispute has been moving forward parallel to a federal criminal investigation of Edwards. The Justice Department is trying to determine whether to prosecute Edwards over payments his donors made to keep Hunter in hiding. Attorneys for Edwards contend he did not violate any laws.
Lawyers involved in the case say federal prosecutors have wrapped up their grand jury investigation and await a decision on whether Edwards should face criminal charges.
An attorney for Young declined to comment on Thursday's filing.