In the context of the PS3, these files serve as the "lock and key" for digital content:
In the context of the PlayStation 3, a (package) file serves as a self-contained installer for game content, including the base game, updates, or downloadable content (DLC). However, possessing the PKG alone is often insufficient to run the software due to Digital Rights Management (DRM).
is one of the most demanding titles to run outside of native hardware:
: For both actual hardware (PS3HEN/CFW) and emulation (RPCS3), using the ISO format decrypted folder (JB Folder) is the standard and most reliable method. Performance Review (PS3 vs. Emulation)