A computer and an Internet connection may soon be all that are needed for anyone to hear closing arguments in a corruption trial or listen to the testimony of a mob turncoat.

The federal judiciary approved a pilot program this week to make free audio recordings of court proceedings available online. Although a court’s participation in the program is voluntary, U.S. District Judge Thomas F. Hogan, the executive committee chairman of the policy-making Judicial Conference, said he expects the system ultimately will be widely used.