Vagrant Licensing

I want to know about the following points for Older releases of Vagrant (versoion 1,2,2.1,2.2,2.3)

  1. What is the License Metric for Vagrant for enterprise (Authorized Users or per Private Boxes)
  2. Is Vagrant On-prem / Cloud / Or both ?
  3. How can we monitor and check license usage in one’s ogranization.