Security Onion is a free and open platform. Most software included in Security Onion is licensed under open source licenses.

Elastic components and Security Onion components are licensed under the Elastic License 2.0 (ELv2). During installation, you will be prompted to accept the Elastic License:



You can find the full text of the Elastic License 2.0 (ELv2) at:

You can find the Security Onion ELv2 announcement at: