Not all PKG files are the same. In the modding scene, a distinction is made between "official" and "fake" packages:
Legally, creating or distributing Fake PKGs of copyrighted games violates the Digital Millennium Copyright Act (DMCA) and similar laws worldwide. Sony actively pursues legal action against major scene releasers and has repeatedly updated the PS4’s security to patch exploits. Console bans are also common; any PS4 that connects to PSN while carrying traces of Fake PKG installation is immediately banned from online services. pkg ps4 games
: Sony uses encrypted PKG files for all digital content on the PlayStation Network (PSN). Not all PKG files are the same
If you are a tinkerer, a homebrew enthusiast, or someone who wants to preserve physical game collections, exploring on a low-firmware console is a fascinating hobby. It allows you to run emulators, back up your discs, and apply mods that are impossible on a standard retail unit. Console bans are also common; any PS4 that