Legally, copyright laws protect game content. Distributing or downloading copyrighted material without permission is illegal in many jurisdictions around the world. The digital Millennium Copyright Act (DMCA) in the United States, for example, provides penalties for circumventing technological measures used to protect copyrighted works and for trafficking in devices or services that facilitate such circumvention.
It is important to note that a standard, unmodified retail PS3 cannot simply install any PKG file found online. The console's security architecture restricts the installation of unauthorized software. To utilize PKG files for games, the console generally requires modification: download game ps3 pkg