When i try to play Phantasy Star Online V2 it asks me for a serial number and access key. Can someone please explain this to me? Also if i enter a legal retail serial and key say my harddrive crashes, but i managed to keep a save of my character, can i just copy my backup save file to the hd and enter the serial and access key accociated with the character when it asks me or am i *cencered* and can no longer use that serial and need to ask for a new one?