Oxygen XML Web Author uses a subscription floating license model with a minimum commitment period of 12 months.
The license key you receive contains the maximum number of user sessions that can simultaneously access the Web Author at any given moment. Note that the use of two different browsers (for example, Firefox and Chrome) by a single user, will consume two floating licenses. However, using two or more windows or tabs of the same browser accounts for a single floating license.
Please note: for Timed Subscription Licenses you will need to register you registration code on the publishers website before using your software.