The core is open source and always will be. Crates are licensed the usual for rust: Apache2 and MIT. This also includes the relay servers.

In addition we provide services that any commercial deployment using iroh will probably find essential: observability and a custom non rate limited relay network, as well as priority access to the engineering team.

iroh is an open source library. The relay servers are open source too but number0 runs public, rate limited, relay servers that can be used by everyone. The commercial offerings are for dedicated relay servers and more insight into your network.