A systems administrator is responsible for managing the licenses for a piece of cloud-based software. Currently, there are 100 users who access the software, and the organization receives a monthly bill for these users. When the organization hires an additional 50 users who also need access, the systems administrator increases the number of licenses by using a web-based management tool, and notices that the vendor has automatically given all users access to the newly released 2.0 version of the software. This is an example of what type of licensing?