How do I acknowledge the VSC in publications?

When using the VSC-infrastructure for your research, you must acknowledge the VSC in all relevant publications. This will help the VSC secure funding and is in fact also a contractual obligation for the VSC.

You'll find a number of standard formulations on this page.

Can I use a licensed program installed on the cluster?

The short answer is: The decision is up to those who pay for the license.

So: ask around in your research group if the group is contributing to the license, read the page on VSC groups, ask your colleagues who already use the program which group you should belong to and request access through the VSC account web site.