For Microsoft 365 Copilot to summarize data within a file, the user must have both the EXTRACT and VIEW usage rights on the sensitivity label applied to that file, according to Microsoft Learn.
This ensures that Copilot can access and process the file's content for summarization purposes.
If a file is encrypted using Azure Rights Management without a sensitivity label, the same permissions (EXTRACT and VIEW) are still required for Copilot to function.
Reference:
https://learn.microsoft.com/en-us/copilot/microsoft-365/microsoft-365-copilot-architecture-data- protection-auditing