To use BBM Enterprise for personal use, you can buy an auto-renewable subscription from within the app. The BBM Enterprise auto-renewable subscription provides access to use the app for enhanced secure communication for 6 months with a 1 year free trial. Payment will be charged to your Apple ID account at the end of the free trial period. The subscription automatically renews unless it is canceled at least 24 hours before the end of the free trial. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase.
Terms of Service: https://www.blackberry.com/us/en/legal/blackberry-messenger