does 1 license = 1 owner?

With regards to Zoom User licensing, a license is tied to a specific email address, so each Licenses is assigned to one individual. That license allows the user to host a single concurrent meeting, but they can host as many consecutive meetings as they wish. If you have a need to host 5 concurrent meetings, you will need 5 licensed users to host those meetings.
https://blog.zoom.us/the-many-reasons-to-upgrade-from-zoom-basic-to-pro/

If you are asking about Zoom Events, then a single Events license allows you to create an event that may contain concurrent meetings.
https://support.zoom.us/hc/en-us/articles/4411702803213-Comparing-the-functionality-of-Zoom-Events-event-types

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