Also, does everyone on the team need to pay the license, just those tweaking it, or just one person per team or per project?
I have edited the description to include the case of teams.
* At least the team lead must own the license
* In addition anyone directly working on the assets (e.g. tweaking them) or with the assets (e.g. making new custom menus with them) must own the license. Any other team members don't need a license.
Hope this helps!