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> The current Firefly generative AI model is trained on a dataset of Adobe Stock, along with openly licensed work and public domain content where copyright has expired.

https://www.adobe.com/sensei/generative-ai/firefly.html#faqs

I'm sure it's all of their content plus half of the web. The proprietary data they get from Behance, Lightroom, Photoshop and Illustrator (and soon figma) has to be a great advantage for them though.

Does not include Behance data or user data.

https://helpx.adobe.com/manage-account/using/machine-learnin...

"The insights obtained through content analysis will not be used to re-create your content or lead to identifying any personal information."

all you've asked is in the FAQ, right at the top.

For what kind of model it is, another poster pointed to https://news.ycombinator.com/item?id=35089661 (a GAN) as a possibility.