Who can modify the ontology (Administration of user rights)?

Who can modify the ontology (Administration of user rights)? The ISO compliant version of the CIDOC CRM ontology can only be modified by the CIDOC SIG. Modifications of the ECRM are carried out via Open Source on GitHub (https://github.com/erlangen-crm). Each user can make modifications of the custom-designed ontology by himself. The custom-designed ontology is reloaded via the administration interface of the WissKI system.