If you are using an older tool or need to install a specific file manually, you may encounter a prompt asking for a zRIF string.

is a compressed, base-encoded license string used to bypass Digital Rights Management (DRM) on PlayStation Vita . These keys allow encrypted game packages (

A is a text-based, compressed representation of a PlayStation Vita digital license file (a .rif or work.bin file). It is primarily used with the NoNpDRM plugin to allow the PlayStation Vita or emulators like Vita3K to run digital games (in .pkg format) without needing the original purchaser's PlayStation Network account. Core Functionality

mmozeiko/pkg2zip: Decrypts PlayStation Vita pkg file ... - GitHub

: A license file generated by the PS Vita when a game is officially purchased and downloaded from the PSN Store.