If you are trying to run FIFA 2005 on a modern PC (Windows 10 or 11), you may encounter compatibility issues. You might need to use a "No-CD" patch or a community-made compatibility fix, as the original "SafeDisc" DRM used on the discs is no longer supported by modern versions of Windows.
The key served to verify a legitimate purchase and was essential for accessing the game's online multiplayer features. Legitimacy: fifa 2005 cd key exclusive