License Key
A license key is unique to a bundle ID.
If you change the bundle ID of an app or create an app with a new bundle ID, you must create a new key for the new bundle ID.
The license key can be created from License Manager.
If you have been created a new key, use the following code to add the key.
>ImageTrackerViewController.swift
func startEngin() { MasMaxstAR.init("your license key") ... }
If you add the wrong license key, ‘Invalid Signature' watermark will be displayed.