In a significant move to bolster data security, Microsoft has announced the expansion of its Data Loss Prevention (DLP) controls within Microsoft 365 Copilot. This extension aims to prevent the processing of sensitive files labeled with sensitivity tags across all storage mediums, including local devices.
Closing the Governance Gap
This update addresses a crucial governance gap in enterprise AI, as earlier DLP enforcement was limited to files stored on SharePoint Online and OneDrive for Business. This limitation left a vulnerability, as files saved locally on employee devices or accessed through network drives were not protected from being processed by Copilot.
With the latest enhancement, Microsoft has broadened its DLP policy coverage, ensuring that sensitive content is safeguarded regardless of its storage location. This development directly impacts organizations with existing DLP rules, as it extends protection to every possible location where Office files might be stored.
Technical Enhancements in DLP
The technical underpinning of this extension lies in how Copilot’s augmentation loop, known as AugLoop, retrieves sensitivity label data. Previously, AugLoop relied on Microsoft Graph to identify sensitivity labels via SharePoint or OneDrive URLs, inherently excluding locally stored files from consideration.
The current update modifies this architecture, allowing Office clients to directly provide the sensitivity label information to AugLoop on the client side. This change removes the reliance on cloud-based URL lookups, enabling consistent application of DLP policies across all storage types.
As a result, when a file carrying a restricted sensitivity label is detected by an active DLP policy, Copilot is effectively blocked from processing the content in Word, Excel, or PowerPoint.
Implementation Timeline and Requirements
According to Microsoft’s roadmap, identified as Roadmap ID 557255 and Message ID MC1234661, this update will begin rolling out globally and to GCC environments in late March 2026, with completion anticipated by late April 2026.
Administrators involved in managing Purview DLP policies are encouraged to review existing sensitivity-label-based restrictions. Updating internal helpdesk resources and informing security and compliance teams about the expanded enforcement capabilities is recommended.
Organizations utilizing Microsoft 365 Copilot must ensure they have a Microsoft 365 Copilot license alongside a Microsoft 365 E5 license to fully benefit from this enhanced DLP feature. Importantly, this update does not alter Copilot’s core functionality but reinforces the governance perimeter concerning content access and processing permissions.
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