You will need a legal copy of the game (the ISO file) from a PS3 disc.
In the world of file sharing, consistency is a way to signal "authenticity." When a specific file size like 1.07 KB becomes the standard, users look for that exact size to ensure they aren't downloading a massive virus disguised as a small text document.
Often, these files contain a link to a website that requires you to "verify" yourself by completing a survey or downloading an "unlocker" tool. These sites generate revenue for the scammer and never actually provide a working code.
