thanks for your reply.
I thought we only use the theme on the preprod and prod version of a site.
I uninstalled the theme from other sites which are test sites with no current reason to use the theme.
I do not dispute the fact of buying a license for each, it is obviously normal.
On the other hand, is it possible to switch the license of the theme from a preproduction site to the production site (it is the same project in this case)?
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.