http://www.macnn.com/articles/10/12/07/downloads.available.for.mac.and.windows/
QuickTime 7.6.9 brings long list of security fixes
updated 07:10 pm EST, Tue December 7, 2010
Downloads available for Mac and Windows
Apple has released a maintenance update for its QuickTime player on Windows computers and Macs running Leopard v10.5.8. Version 7.6.9 focuses on security, addressing a long list of reported vulnerabilities. The update brings improvements to file handling for JP2, GIF, PICT and FlashPix images, along with several video formats including AVI, MPEG, Sorenson, and QTVR. The changes are designed to protect against attacks from maliciously crafted files.
QuickTime 7.6.9 is now available as a free download directly from Apple's support site or via Software Update. The update is geared for Windows computers or Macs running Leopard, as the most recent version of Mac OS X (v10.6.5) already contains the security fixes. [Windows download - 32.8MB]
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QT 7.6.9 download clarification
Apple has a download link for the Windows version of QuickTime 7.6.9. There is no download link for Mac OS X 10.5.x Leopard users. The only way for 10.5 users to get this update is though Software Update.