Perhaps you could do something like this:

  1. Add a folder in ServerStorage called "NotificationLicense"

  2. Add a Script in the folder, rename it to something like “LicenseInfo”, put in the licensing details, and make sure to right-click and disable the script

  3. Within ServerScriptService, add a Script which will always check after a certain amount of time (or checks forever) for game.ServerStorage.NotificationLicense.LicenseInfo.

  4. If LicenseInfo is always found, then that proves the user has the license within the notification system. If it is not found, then the notification system will stop all scripts, etc, and remove itself from the game.

The same could go for … well, basically anything. It could also check for a specific set of values within a TextLabel on a Frame in a ScreenGui.

Let me know if this helped with anything,
@OH20_rbLX