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Meta made its Llama 2 AI model open-source because 'Zuck has balls,' a former top Facebook engineer says
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
In the AI world it's a bit different. You can do whatever you want with the model and weights data which will net you the functional part of the resulting product. Train, retrain, dissect, segment...etc. They're just not giving out the source for the actual engine. The people working with such things really only care about the data, and in most cases, would probably convert it to a different engine anyway.
Can I remake the model only including Creative Commons sourced training material?
You can reuse the data however you want, yes. You just can't do it with their proprietary model. So, again, the ENGINE is not open source (the thing that drives their released version), but the model and data as it runs as released you can do whatever you want with.
I thought I was only licensed for non-commercial use
Nope. Free for educational, research, or commercial. I'm sure their license has some restrictions on what that actually means once you get to be competitive with the original as a product, but otherwise free unless you start a massive enterprise based on it, at which point you probably wouldn't use it anyway. It's just an LLM, it's not doing anything super special like folding proteins for drug development, or curing cancer.