Restrict Copilot from accessing OneDrive Files.

FooReady  - what additional risk does Copilot introduce to data that M365 search has already indexed? What does the customer think is happening when Copilot "reasons over" the data?

It's all security trimmed, so unauthorised users cannot force Copilot to access data to which permission is not granted?

If the customer is really worried then they shouldn't be storing their <gollum>precious</gollum> in OneDrive but in a Team/SharePoint site with container level label that enforces encryption. See https://learn.microsoft.com/en-us/purview/ai-microsoft-purview-considerations for more.