sentences:  On April 6, 2007, Square Enix filed for United States trademark registration of "Dissidia"; the mark's relation to "Final Fantasy" was omitted.The title was connected with "Final Fantasy" when Square Enix introduced "Dissidia Final Fantasy" on May 8, 2007, with an official Japanese website.The "Dissidia Final Fantasy Original Soundtrack" by Takeharu Ishimoto was released on December 24, 2008, and is available in both regular and special editions, similar to the game itself.