Apple has released QuickTime 7.6.9 for Mac OS X 10.5.8 and Windows users. , QuickTime 7.6.9 addresses 15 security issues. The detail of the security update is available here at Apple's Support page.
QuickTime 7.6.9 for Mac OS X 10.5.8 Leopard can be downloaded from QuickTime website or Apple Software Update.
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