Before diving in, it's helpful to have a clear understanding of the core terms and components involved. Here's a quick reference guide to the key elements you'll encounter when dealing with God of War III Remastered PKG files.
Do not attempt to go on PSN with a jailbroken PS4 or installed PKG files. Sony's anti-tamper systems will detect the modified eboot.bin immediately. The "fixed" PKG is strictly for offline, single-player enjoyment of Kratos' epic journey.