Mac OS X 10.5.8 Combo Update
http://support.apple.com/kb/DL866?viewlocale=ja_JP
Safari 4.0.3
http://www.apple.com/safari/download/
QuickTime 7.6.4 for Mac
http://www.apple.com/quicktime/download/
Security Update 2009-005 (Leopard)
http://support.apple.com/kb/DL935?viewlocale=ja_JP