Here is a description how the Tekla Structures student license works.
When you register to Tekla Campus, you create a Trimble Identity. The username and password of this account act as your student license Tekla Structures educational configuration. You need to give your username and password in a dialog which pops up after starting Tekla Structures:
After giving the username and password, Tekla Structures connects to the online license server, and after the license checks are ok, the software starts up. The software pings the online license server every now and then during the session.
You need to be online more or less on regular basis in order to use Tekla Structures educational configuration. There is an "offline buffer" in the student license, and the buffer helps you to work continuously for example despite an unstable internet connection. Offline buffer is valid for one day since your last successful Tekla Structures student license connection online.
The license is valid for 4 months. As the time goes by and the due date approaches, both Tekla Structures educational configuration and Tekla Campus website will remind you about the expiry. It is possible to apply for renewal after 4 months.
Tekla Structures student license is meant for educational usage, and it’s designed for individual students. The licensing terms limit the usage of Tekla Structures educational configuration for non-commercial use only.