From oblivion forums:
http://www.elderscrolls.com/forums/index.php?showtopic=262788
excerpt: "We certainly don't want anyone using the work we've done on Oblivion in mods for other games, so we have our part when it comes to other games. Please stop using assets from other products for Oblivion mods, and please do not use any assets from Oblivion for projects in other games. "
http://www.elderscrolls.com/forums/index.php?showtopic=262788
excerpt: "We certainly don't want anyone using the work we've done on Oblivion in mods for other games, so we have our part when it comes to other games. Please stop using assets from other products for Oblivion mods, and please do not use any assets from Oblivion for projects in other games. "