Not a lawyer so I can’t be sure. To my understanding a summary of a work is not a violation of copyright because the summary is transformative (serves a completely different purpose to the original work). But you probably can’t copy someone else’s summary, because now you are making a derivative that serves the same purpose as the original.

So here are the issues with LLMs in this regard:

• LLMs have been shown to produce verbatim or almost-verbatim copies of their training data
• LLMs can’t figure out where their output came from so they can’t tell their user whether the output closely matches any existing work, and if it does what license it is distributed under
• You can argue that by its nature, an LLM is only ever producing derivative works of its training data, even if they are not the verbatim or almost-verbatim copies I already mentioned