Lawyers for Bill Cosby are urging a court to reseal the actor's deposition testimony about extramarital affairs, drugs and payments to women.
Cosby does not want the decade-old testimony used in the legal battles he is fighting with women who accuse him of sexual assault or defamation.
A federal appeals court in Philadelphia is hearing the arguments.
The 78-year-old hopes to overturn a ruling that made the documents public last year.
The media argues that the issue is now moot given the widespread coverage that ensued.
Cosby admits to several affairs in the deposition and says he obtained prescription sedatives (quaaludes) to give to women he hoped to seduce.
The deposition stems from a lawsuit filed by the accuser at the centre of his pending criminal case.