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Then that would no longer be an Open source license.

Or, with a little more detail: "Open Source" is defined by the Open Source Definition (https://opensource.org/osd), and clause 6 requires no constraint of fields of endeavor.

Which means, you cannot limit the purposes for which your software is used.

If you wanted to prohibit it being used to train ML models, you could add this restriction to your license, but it would no longer be Open Source(TM).

My understanding is that Open Source means just that - The source is open for inspection. It doesn't immediately imply that the source is open for free usage by all.

That's merely https://en.wikipedia.org/wiki/Source-available_software

Thanks, I was just about to ask.

It's worth reading the definition: https://opensource.org/osd

I think this would likely fall foul of clause 6, in that using the software for training ML models would likely be considered a "field of endeavor". It's not the classic application of this clause (ie. "you can't use this software for military purposes", etc), but I think it'd still be covered.

Of course, IANAL, and your lawyer's opinion might differ.

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