Security Bulletin at http://docs.info.apple.com/article.html?artnum=307176 via CoU
So I grab it then it says in the Software Updater application:
QuickTime 7.3.1 addresses security issues.
This release is recommended for all QuickTime 7 users.
For detailed information on this update, please visit this website: http://docs.info.apple.com/article.html?artnum=61798
Important Notice to QuickTime 6 Pro Users
Installing QuickTime 7 or later will disable the QuickTime Pro functionality in prior versions of QuickTime, such as QuickTime 6. If you are a QuickTime 6 Pro user and you proceed with this installation, you will need to purchase a QuickTime 7 Pro registration code in order to regain QuickTime Pro functionality. After installation, visit theApple Online Store to purchase a QuickTime 7 Pro registration code.