I must thank Florian Fosterwho correctly grasped my dilemna around derivative work and which answer is very accurate and correct.

I was unaware the daemon itself was in MIT licence, sorry, that eliminates A LOT of potential issues in my case since MIT is "non-contaminant".


Le 05/04/2017 à 08:34, Matthias Runge a écrit :
Food for thought: as a customer relying on the functionality, you would
probably be willing to pay for support, like getting help with
installation, get a hand when it breaks, report false values, crashes,
whatever. You could offer the plugin under the same license as collectd
and offer professional support. Ideally, your plugin would be part of
upstream collectd.
Matthias

[1] https://github.com/collectd/collectd/blob/master/COPYING#L1-L9

This is more complex than that. You may be able to run a business selling only service but if you run a restaurant you can't serve empty plates. I plan to make some kind of "plugin store" where i can sell plugin dev both on demand and on shelf, which is not something possible if your clients can freely exchange their plugins without coming back to you.

The idea of a plugin store might sound to an open source community like the devil, but truely for your community it's free testing and debugging, and most probably free pull requests for all existing OS plugins that I find not good enough, but not profitable to rewrite.

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