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License and Copyright


  • proprietary software can implement the Mercure specification

  • proprietary publishers and subscribers can be used with the Hub without having to share their sources

  • modifications made to the Hub must be shared

  • alternatively, commercial licenses are available for the Hub

The specification is available under the IETF copyright policy. The Mercure specification can be implemented by any software, including proprietary software.

The Hub is licensed under AGPL-3.0. This license implies that if you modify the Hub, you must share those modifications. However, the AGPL-3.0 license applies only to the hub server itself, not to software using this hub.

For companies not wanting, or not able to use AGPL-3.0 licensed software, commercial licenses are also available. Contact us for more information.