Hi, we have the share option in Nexus, but it is not very handy for an entire team or for all students in a lecture - often, universities put the database in a secured folder in their intranet, so this is probably the best choice also for you.
If it is only between you and your professor, you could indeed register in Nexus though, and then your professor needs to request in Nexus to share the database with you.
All the best,
Andreas