Books about QuickTime are also available. There are many email discussion lists where users, developers, network administrators, and content authors can discuss QuickTime-related topics. Held in October in Los Angeles, this conference is the place to hear the latest information about QuickTime, as well as meet the rest of the developer community. Search for QuickTime to see a list. If your key no longer works, visit the Apple Store to purchase a new one.
Pro keys are platform-specific.
Windows keys will work on all supported Windows platforms. I've lost my QuickTime Pro key. Visit the Software Purchases area to retrieve your key. I have my key but have lost the program. During the installation process you will be prompted to enter your username and key, which will unlock QuickTime Pro.