FFVII

Only in America and Europe and only as far as retail goes...They might hold some sway in said regions for console retail releases I'm not sure...

This would not prevent the game from coming to XBLA in any legal way...

Edios published the Windows version....So technically MS already got FFVII....And now the Right revert back to SE

Further more a port of the Windows version can come the Xbox 360....

Square can release the game at retail In Japan on Xbox 360 and distribute to some other International places...

FFVIII

Sony Published the PAL version

Square teh Japan version

Square EA handled the NA version and since that merger has been dissoveled (Which was only a Publishing deal) Square has the NA Rights again

Edios again released the Windows  version so the same rules apply...SE get the rights to the windows versions...

FFIX

Japan: Square

EU:Infrogames

Square Eroupe handled the rest of UK and the Aussie version

No windows version

FFX

Japan: Square along with Int version

NA: Square EA

PAL: SCE Eroupe

So basically.....Sony has the right only in certain Regions and those right only strecth as far as retail for Consoles..

Since FFVII had a Windows version it is possible for it to appear on Xbox 360 via digital Download and no retail....

In conclusion...No SONY does not have the rights to anything related to FF...It only helped publish the game in certain Region and only on the PS brand....So basically for the most part Sony has control over the PS version of FF game from FFVII to FFX to a small extent...Sony would not be able to publish the games again with out SE's permisson...SE on the other hand can do what ever they want with the FF games fro VII to X....

FFX