The "Resource Access Pass" or license file. Without this, RPCS3 cannot decrypt and play the game. How to Install PKG Games on RPCS3
Patches that fix bugs or add performance improvements. rpcs3 pkg games download
You can legally download and demos directly from Sony’s official servers using a tool called PSNStuff or the built-in RPCS3 updater. These do not require cracking or piracy because they are free to distribute. The "Resource Access Pass" or license file