A “user” is the individual person who uses VersionSQL. Licenses are per-user, not per-computer: the licensed user can install and run VersionSQL on the computers, virtual machines, or similar devices they personally use. If additional people want to use VersionSQL — even on the same machine — additional licenses are required.
Note that multiple licenses may be tied to a single license key file. If purchasing VersionSQL for multiple users, please specify a quantity when checking out.