Rielle Hunter, who bore the former presidential candidate a daughter, is suing former Edwards aide Andrew Young and his wife, asserting they took the tape and photos of Edwards with the girl from her.
WRAL-TV, Raleigh, said no details of Edwards' deposition were known, but it could be relevant to the federal investigation of possible funding offenses during his 2008 campaign. The statement could be used in Edwards' cross-examination were he to testify in a criminal trial.
WRAL also reports that federal prosecutors may announce whether they will indict the former senator within weeks.
Judge Carl Fox has ordered Edwards' depositions kept confidential and threatened to jail anyone who discusses them outside court.
Hunter says Young, who pretended to be her child's father during the campaign, used the video and photos to get book and movie deals.
Young surrendered copies of the sex tape and CDs filled with photos to the court, where they are being kept under seal until the lawsuit is resolved.