A package is a large download of information that a starship or remote planet receive from communication buoys every few days. Even though the AI virus has been stopped in most civilized regions of space, the package is a process to delay network traffic so there is sufficient time to wipe out any AI threat contained in the code or at least halt its progress if it were to start to spread.
For starships, a package is downloaded when arriving in major regions of space with communications buoys. This normally means the Grey Union, Confederacy, and a few locations in the Fringe. The download contains messages (text and video), current news, and other media.
Packages are produced by various media companies with the Grey Union having the most choice and freedom of information. This is normally a subscription service that a ship pays for or a remote planet splits the cost with its population.