What does HRESULT 0xC00D271C (NS_E_DRM_INVALID_LICENSE_REQUEST) mean?

NS_E_DRM_INVALID_LICENSE_REQUEST

What failed in WMDRM

NS_E_DRM_INVALID_LICENSE_REQUEST is Windows Media DRM HRESULT 0xC00D271C. It identifies the generated or supplied license request is not valid for the protected content. The useful scope is the asynchronous path that builds a license request from the protected content header, sends or exposes the challenge, receives a response and commits accepted licenses to the local store; it is not a generic statement that the media player, network or file system failed.

Record request mode, header KID, acquisition URL, challenge size and request-generation result.

Evidence worth preserving

• Code-specific proof: record request mode, header KID, acquisition URL, challenge size and request-generation result.
• Protected identity: content KID and license acquisition URL from the header.
• Operation state: silent or non-silent acquisition mode and callback/event sequence.
• Persistence or transport: request or challenge identifier and response HTTP status.
• Security context: server certificate, response signature and returned license count.
• Correlation point: store commit result after a successful server response.

The surrounding protocol and store state

License acquisition and license storage are separate stages: a valid server response can still fail while being validated or committed locally. Because acquisition is asynchronous, starting a second request before the completion event can produce a state error rather than a network failure.

Diagnostic sequence

1. Locate the earliest API return, callback or event containing this result and 0xC00D271C.
2. Identify the exact content, license, store, device or migration object instance involved in “request”.
3. Determine whether “request” occurred before network exchange, during response validation, while enforcing policy, or while committing protected state.
4. Perform the code-specific check: record request mode, header KID, acquisition URL, challenge size and request-generation result.
5. Make one targeted change — rebuild the request from the unmodified content header with matching client state — and repeat the same producing operation.

Related codes and the diagnostic split

Correcting the producing condition

To correct this, rebuild the request from the unmodified content header with matching client state.

Representative case: A cached challenge from another asset is submitted for the current KID.

Actions that do not prove a fix

• Avoid logging complete license challenges, responses, cookies or credentials in diagnostic output.
• Avoid blindly retrying a state-changing license request without correlating the previous challenge and completion event.
• Do not reduce this result to “DRM failed” in telemetry; retain the HRESULT, symbolic name, operation and object identity.

Regression check

After the repair, recreate the WMDRM object and run the smallest reproducer. Confirm that 0xC00D271C no longer occurs, that the intended license action completes, and that no store, certificate, clock or migration warning replaces it.

Code-specific operational note

The user-facing message “The media file is corrupted. Contact the content provider to get a new file.” describes the visible condition but does not identify the producing API, object instance, or protected identity by itself.

Technical references

• Acquiring licenses.
• Handling license acquisition events — platform documentation used to distinguish this result from adjacent results.
• DRM protection and license distribution.
• DRM client programming guide