Not all QuickTime Pro keys will enable the pro features of QuickTime 5. This article explains which keys will and will not enable pro features.
Not all QuickTime Pro keys will enable the pro features of QuickTime 5.
If you purchased a QuickTime Pro key before the above date, you must purchase a new key to enable QuickTime 5 Pro features. New keys may be purchased from The Apple Store (http://www.apple.com/store/) .
QuickTime 6 Pro
QuickTime 6 replaces earlier versions of QuickTime. A QuickTime 6 Pro key is required to unlock Pro features of QuickTime 6. If you wish to use a QuickTime 4 or 5 Pro key, you need to use an earlier version of QuickTime, which you can download from the Apple Support Web site (http://www.info.apple.com/usen/QuickTime/).