Apple releases QuickTime 7.4.5 in conjunction with iTunes 7.4.2.
QuickTime 7.4.5
QuickTime 7.4.5 includes fixes that enhance reliability, improve compatibility with third-party applications, and address security issues. This release is recommended for all QuickTime 7 users.
For detailed information on the security content of this update, please visit this website: http://www.info.apple.com/kbnum/n61798.
QuickTime is available for Mac OS X Panther, Tiger, and Leopard as well as Windows XP and Vista.