PS3 uses a layered security model:

(commonly known as DLPSGame ) is a long-standing web platform specializing in the preservation and distribution of PlayStation-era software. It primarily serves as an archive for ISO , ROM , and PKG files for consoles ranging from the PSX and PS2 to the PS3, PS4, and PS5. Core Functionality

: RPCS3 works best with decrypted folder formats (often called "JB folders") or standard .ISO files.