You can use any Music production license on 3 machines simultaneously. If you ever stop using one of those machines, you can easily deactivate it.
Like the Product Activation, Below is a simple guide on how to deactivate a plug-in from the Music Production line.
Online Product Deactivation
1) Open your plugin and click the Key icon on the bottom toolbar to open the Evaluation screen.
2) Once it's open, make sure that you have I'm Online checked and then click the Deactivate button.
3) Your product is deactivated!
The status of the license will also be up to date on the accusonus toolbar. After the deactivation Product deactivated label will appear on it.
Tip: If you want to reactivate an accusonus product that was previously deactivated in your system, just click the Activate button again. The plug-in will remember its product key.