The GeneXus Protection Server utility is the protection system for all GeneXus products requiring authorization.
Installation is required in order to share licenses between developers accesing GeneXus from differentes computers.
Check the documentation here.
You can download it from the Download Center; latest version is 9.4.16.
Note: GeneXus Protection Server does not support downgrades, if a downgrade is made all licenses could get suspended. Upgrading the GeneXus Protection Server, when licenses got suspended, might fix the issue.