DTL License Server centralizes the license lifecycle of a client application and restricts each license to its permitted number of computers.
The project combines a lightweight PHP and MariaDB Web service, a Python administration utility, and a module ready to integrate into a client application. User computers never connect directly to the database.
See
https://netdtl.com/DTL_LicenseServer.html
https://netdtl.com/DTL_LicenseServer_en.html
for more.
Repo: https://github.com/DidierMorandi/DTL_LicenseServer