PromptSec vs. Microsoft Purview DLP.
Purview DLP extends Microsoft's own data-protection policies into Microsoft 365 Copilot. PromptSec covers every AI tool an employee actually opens — Copilot included, but not only Copilot.
Microsoft Purview DLP extends Microsoft 365's existing data-protection policies to Microsoft 365 Copilot — strong if your organization's AI usage is entirely inside that ecosystem. PromptSec is a browser extension that covers any AI tool in any tab, including ChatGPT, Claude, Gemini, and the shadow AI usage that never touches Copilot or a Microsoft 365 license at all.
What each one actually covers
Microsoft Purview DLP
Purview's data-loss-prevention policies — the same ones that already govern SharePoint, Exchange, and Teams — extend into Microsoft 365 Copilot interactions. It's a natural fit for an organization whose AI usage is entirely Copilot, licensed and administered through the same Microsoft 365 tenant.
PromptSec
Employees rarely limit themselves to one AI tool. PromptSec's browser extension catches sensitive data headed to Copilot and to every other AI tool an employee opens — the ones Copilot licensing was never going to see.
Side by side
Based on publicly available information; check Microsoft's own documentation for current specifics.
| Microsoft Purview DLP | PromptSec | |
|---|---|---|
| Ecosystem | Part of Microsoft Purview, extending Microsoft 365 compliance and data-protection policies to Microsoft 365 Copilot. | Vendor-neutral. Runs the same way against ChatGPT, Claude, Gemini, Copilot, Perplexity, or a self-hosted Open WebUI instance. |
| Coverage | Strongest where an organization is already deep in the Microsoft 365 / Copilot stack. | Covers any AI tool an employee opens in a browser tab — including ones IT never approved or licensed. |
| Deployment | Configured through the Microsoft Purview compliance portal, tied to a Microsoft 365 tenant. | A Chrome MV3 browser extension, rolled out through browser policy — no tenant dependency. |
| Where detection runs | Server-side, within Microsoft's compliance infrastructure. | On-device in the browser by default; prompt content doesn't reach our servers unless cloud escalation is explicitly enabled. |
Do you need both?
If your organization is fully standardized on Microsoft 365 and Copilot is the only AI tool in use, Purview's existing DLP policies extending there is the path of least resistance. Most organizations we talk to aren't in that position — usage spans well beyond one approved, licensed tool.
That gap — the AI tools nobody licensed through Microsoft — is shadow AI. What it is, and why it's larger than most security teams expect.
Find out what your team is
already sending to AI.
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