If you type "Sony Vegas Pro 8 Authentication Code" into Google, you will find countless forums, YouTube videos, and "keygen" websites. Engaging with these is a catastrophic mistake for three reasons.
Instead of trying to activate within the software, log in to the MAGIX My Service Center . You can often register your old Sony serial number here, which may provide a direct download of a version that is pre-patched or easier to activate. Sony Vegas Pro 8 Authentication Code
Here's how the authentication code works: If you type "Sony Vegas Pro 8 Authentication