AI Training on Copyrighted Data - who owns code written with Copilot

I publish illustrative scenarios prepared by my practice. All participants and conversations are fictional. The fictional posts are not posts by real users, accounts of client experiences, or reports of actual results.
Illustrative scenario prepared by my practice.
For informational purposes only. This is not legal advice. Laws vary by jurisdiction. Consult a qualified attorney for advice specific to your situation.
Hypothetical question

Has anyone dealt with something like this? I'm not sure what my options are.

who owns code written with Copilot. I've been dealing with this for about 8 months now and the situation isn't improving.

This involves content I created over the past 7 months. I do have documentation proving my ownership and timeline.

Has anyone been through something similar? What worked for you?