This is a prefix often used by specific groups in the "scene" (homebrew and modding communities) to label modified or repackaged PlayStation 4 content.
Version 1.28 was crucial because it contained data for various bike expansions and car packs. For those trying to play the game with all content unlocked offline, this specific update version is the "gold standard." The Legacy of Driveclub spsxdriveclubcusa00093usaupdatev1285
If you are looking for this file to update a standard, retail PlayStation 4, it will not work. These "SPSX" formatted files are designed exclusively for consoles running custom firmware (CFW). For the average user, the only way to play Driveclub today is to find a physical disc copy, though you will be limited to offline modes only. This is a prefix often used by specific