HRESULT 0xC00D271C (NS_E_DRM_INVALID_LICENSE

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Description:

The media file is corrupted. Contact the content provider to get a new file.%0

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NS_E_DRM_ENUM_LICENSE_FAILED	NS_E_DRM_UNABLE_TO_INITIALIZE

NS_E_DRM_INVALID_LICENSE_REQUEST

The failing WMDRM boundary

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.

The built-in message summarizes the user-visible outcome, while the symbolic phrase “invalid license request” preserves the exact WMDRM boundary for diagnosis. For this code, the proof step is to record request mode, header KID, acquisition URL, challenge size and request-generation result.

Evidence worth preserving

Capture the first NS_E_DRM_INVALID_LICENSE_REQUEST occurrence before retry or teardown changes state. The smallest useful record contains:

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.

Prefer IDs, hashes, sizes, and timestamps. Never log keys, passwords, licenses, or decrypted media.

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

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

Related codes and the diagnostic split

Result	Different boundary
`NS_E_DRM_UNABLE_TO_ACQUIRE_LICENSE`	The acquisition workflow did not produce a usable license.
`NS_E_DRM_INVALID_LICENSE_ACQUIRED`	The server response completed but the returned license is not acceptable to the client.
`NS_E_DRM_ACQUIRING_LICENSE`	Another license acquisition is already active for the DRM object.

Order the NS_E_DRM_INVALID_LICENSE_REQUEST event chain by timestamp; prefer the earliest specific result.

Correcting the producing condition

The corrective direction is to rebuild the request from the unmodified content header with matching client state. Preserve the original content/header, store or migration material for NS_E_DRM_INVALID_LICENSE_REQUEST until the operation succeeds and survives a fresh application object or required restart.

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. That changes evidence without demonstrating why NS_E_DRM_INVALID_LICENSE_REQUEST was produced.
Avoid blindly retrying a state-changing license request without correlating the previous challenge and completion event. That shortcut can create a second store, identity or policy problem.
Do not reduce NS_E_DRM_INVALID_LICENSE_REQUEST 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 for NS_E_DRM_INVALID_LICENSE_REQUEST. 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 symbolic phrase “invalid license request” is the important search and telemetry key for NS_E_DRM_INVALID_LICENSE_REQUEST. Keep it beside the exact value 0xC00D271C; the official message “The media file is corrupted. Contact the content provider to get a new file.” is useful to users, but it does not identify the producing API, object generation or protected identity on its own.

Technical references

Acquiring licenses — API and state rules relevant to this boundary.
Handling license acquisition events — platform documentation used to distinguish this result from adjacent results.
DRM protection and license distribution — official Windows Media DRM context for NS_E_DRM_INVALID_LICENSE_REQUEST.
DRM client programming guide

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