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[paho-dev] Status of MQTT-S spec

Someone was asking about the MQTT-S specification, and I noticed that its licensing seems to be unclear.


[1] says “Like MQTT, the detailed specification of MQTT-S is open and available at 


But the spec document[2] on simply says “© Copyright IBM Corporation 2008, 2011. All rights reserved.”  I’ve looked through that document as carefully as I can, and I do not see any license grant similar to what is in the MQTT spec[3].


Can anyone clarify for me what the status is on the ability on anyone other than IBM to implement MQTT-S? Is this some oversight that can be easily fixed?








Mike Milinkovich

Executive Director

Eclipse Foundation


+1.613.220.3223 mobile

+1.613.224.9461 x228 office



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