The QuickTime File Format became the basis for the MPEG-4 standard. Over the 1990s, QuickTime became a dominant standard for digital multimedia, as it was integrated into many websites, applications, and video games, and adopted by professional filmmakers. Because of this, Apple has often been criticized for its decision to require Mac OS X users to buy a QuickTime Pro key to use certain Player features.QuickTime was created in 1991, when the concept of playing digital video directly on computers was 'groundbreaking.' QuickTime could embed a number of advanced media types, including panoramic images (called QuickTime VR) and Adobe Flash. some video editing packages that rely on QuickTime for their export/import abilities do so by using the QuickTime framework, no matter if a Pro key is present or not, and iTunes and its audio encoders do not require the Pro license to work.

Other software that uses the QuickTime framework can use the save/export features without the need for a license, e.g. In Mac OS X, the 'Pro-only' features are actually available from within the QuickTime framework, and the limitations in the free version apply only to the QuickTime Player application. The full QuickTime Pro package is included as part of the Final Cut Studio editing suite from Apple. Exporting ( encoding) videos opened in QuickTime to a wide variety of different video codecs (MPEG-4, H.264 (since version 7), Animation, DV, mjpeg), still graphic formats (TIFF, PICT, JPEG), and Audio (WAV, AIFF, ACC, MP3).Full-screen playback (which can be enabled in the Mac OS X version through AppleScript).QuickTime Pro adds the following features to the standard QuickTime player:

The functions of QuickTime Pro can be enabled by typing in a Name and a Serial Number (which is purchased at the Apple Store) in the 'Register' Menu of the standard QuickTime Player. QuickTime Pro is a paid version of Apple Computer's free QuickTime media playback software.

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