Crossbar.io is distributed under a dual-license model, i.e. it is available under either an open source license (AGPL v3) or a commercial license.
Tavendo holds the full rights in the source code of Crossbar.io, enabling it to control the licensing.
To receive more information about receiving a commercial license for Crossbar.io, please contact firstname.lastname@example.org.
Why the APGL v3?
The AGPL v3 was chosen since this was the only license to fulfill all the requirements we had:
- It is a well-known license where there is at least some certainty about its legal ramifications and interoperability with other licenses.
- It is a copyleft license, requiring third-party improvements to be contributed back to the community.
- The requirement to contribute back also exists when Crossbar.io is offered as a service to the public accessible via a network without redistribution of changed source code.
Clients as Separate Works
We see any code which connects to Crossbar.io via WAMP as a separate work. The Crossbar.io license (the AGPL v3) does not apply to WAMP clients. This applies irrespective of where these run, i.e. also to components which are run side-by-side within a native worker of type router, which are run in a native worker of type container or in a guest worker.
We promise to stand by this view of the license. If you need further assurance, you can email us at email@example.com for a signed letter asserting the above promise.
Permissive Licenses for Client Libraries
We release all our client libraries (those provided by the Autobahn project) under non-copyleft licenses, which allow their use for closed-source & commercial software. For other client libraries see their respective licenses (the publicly available ones appear to be universally non-copyleft as well, so you should be able to use them in any kind of project).
Copyright and Trademarks
See the Copyright and Trademarks page.