A still from the hostage tape
A hostage tape was a recording made by a hostage taker, in which hostages detailed their current status and any demands the hostage taker might have.
In 2287, Sybok recorded and transmitted a hostage tape in which Caithlin Dar served as spokesperson for Sybok's hostages, while he spoke for the Galactic Army of Light. (Star Trek V: The Final Frontier)