QuickTime 6.5.2 new features
Messages in iTunes report that QuickTime 6.5.2 is required to use music purchased from ITMS in other applications such as iPhoto or iMovie.
QuickTime 6.5.2 includes security and bug fixes. I also includes improved Apple Lossless and AAC Encoder, as well as a better management of iTunes and other QuickTime-related applications.
www.apple.com/quicktime/download/index.html
