The International version of FFX has some additions over the NA (North American) version. It has Dark Aeons, a super hard boss called Penance, and the expert Sphere Grid. None of that is in the NA version.

PAL is a common format for DVD players and video game consoles in the British Isles. It's not compatable with NA. My guess is you have PAL.

I've never played the International version, so I tend to be stumped when people ask about them.