Installation of Final Cut Studio 3 fails due to a Protection Error

Hi,
I have been using the Final Cut Studio installed on my iMac for about 3 years now. Recently, I bought a Mac G5 and tried installing the Final Cut Studio on this machine as well. However, the software does not work with my G5 and reports a protection error that prevents the application from running on two computers of the same network. Is there a condition limiting the number of machines on to which one can install Final Cut Studio? A friend of mine claims to have installed the software on at least 3 different machines without receiving an error. However, I seem to consistently get this error if I try to install this software. Is this an issue with my product license? Please advice on how to fix this problem. I need Final Cut Studio to work on both machines in the network. Thanking you for all the help given in advance.
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Error:
Protection Error
This application cannot continue because another application with an identical serial number is already running on another computer on your network.
