This App has provided a mechanism that you can use to protect your App. However, because it is your App, there is some coding required by you to achieve this – whichever approach you take.

TestEntitlement_API command,  Autodesk App store entitlement Entitlement API is used to identify the entilment of the user. 

This command will make a simple HTTP (REST) call to the Entitlement API, passing in the unique ID of this App (8838710715095167987), and the unique Id of the customer currently signed in to their Autodesk Id from the Autodesk product in which this add-in is running. The Entitlement API response will tell whether the user has an ‘entitlement’ to use this App (I.e whether that user has purchased/downloaded this App).

The installer that ran when you downloaded this plug-in from Autodesk App Store has already installed the plug-in. You may need to restart AutoCAD to activate the plug-in.

To uninstall this plug-in, click Control Panel &; Programs &; Programs and Features (Windows 7/8.1/10) or Control Panel & Add or Remove Programs (Windows XP), and uninstall as you would any other application from your system.

The panel on the Plug-ins tab will not be removed until AutoCAD is restarted.

For more information  http://www.autodesk.com/developapps