Technically, the simple text file is also a reminder of the low barrier to distributing digital goods. A string of characters in a .txt can be copied endlessly at near-zero cost, amplifying the damage when shared without permission. Digital rights management (DRM) systems and license servers attempt to manage this, but they also raise debates about user rights, ownership, and the right to modify purchased software.

: Search your inbox for "Aerosoft" or "Steam" to find your purchase receipt. Steam Library

Access to the Steam Workshop , which provides hundreds of community-created skins and buses.