Welcome to QuickTime 6, featuring MPEG-4, the next-generation of the most advanced digital media technology on the Internet. This latest release of Apple?s cutting-edge digital media software for both Mac and Windows-based computers delivers unparalleled quality for creating, playing and streaming audio and video content over the Internet. The free QuickTime Player allows you to play back content of dozens of formats from thousands of sources. QuickTime Pro gives you the ability to create and edit your own multimedia, as well as to save movies and to play back movies in full screen mode. QuickTime 6 will replace older versions of QuickTime. A QuickTime 6 Pro key is required to unlock Pro functionality in QuickTime 6. If you wish to use a QuickTime 4 or 5 Pro key, you need to run an older version of QuickTime for Pro features.