Content ownership.
WHAT MODELS GENERALLY DO NOT DO
Reproduce training material verbatim, usually.
Though they can reproduce memorised text, particularly passages that appeared many times.
THE RISK
Generated text closely resembling an existing source, without either of you knowing.
WHAT TO DO
Run substantial content through a similarity check before publishing Do not ask for content "in the style of" a specific living writer for commercial use Do not paste someone else's article and ask for a rewrite
THAT LAST POINT
Rewriting someone else's article is still using their work. Changing the words does not change that.
WHAT ABOUT OWNERSHIP OF AI OUTPUT
Varies by jurisdiction and by the tool's terms.
Check the terms of the service you use.
In some jurisdictions purely AI-generated content may not attract copyright protection, which means others could use it.
WHAT PROTECTS YOU
Substantial human contribution: your expertise, your examples, your editing.
FOR ANYTHING COMMERCIALLY SIGNIFICANT
Take proper advice. The position is unsettled and changing.