Always ensure you are using backups of games you personally own. Piracy is a violation of terms of service and harms the industry. PKG files should be used as a tool for preservation and convenience for your existing library.

When running Killzone 2 from a PKG on the internal drive, many players report a smoother experience. The game is famous for its "deferred rendering" technique, which pushed the PS3 to its limits. By eliminating the seek times of a physical disc, texture streaming is often more consistent, reducing the occasional pop-in seen during intense firefights on Helghan. A Note on Legal Content

Place the PKG files in the root directory of the USB.