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NS_E_LICENSE_HEADER_MISSING_URL
What failed in WMDRM
0xC00D277A maps to NS_E_LICENSE_HEADER_MISSING_URL. Read it as a result from license challenge, acquisition and server response processing: the DRM content header lacks the license acquisition URL needed by the client. Preserving the first NS_E_LICENSE_HEADER_MISSING_URL occurrence prevents a later playback message from hiding the original DRM failure.
Capture the header version, KID and URL attributes.
Place in the DRM workflow
The workflow around this result matters: license acquisition and license storage are separate stages: a valid server response can still fail while being validated or committed locally. In addition, because acquisition is asynchronous, starting a second request before the completion event can produce a state error rather than a network failure.
State to capture before retry
The smallest useful record contains:
- Code-specific proof: capture the header version, KID and URL attributes.
- Protected identity: silent or non-silent acquisition mode and callback/event sequence.
- Operation state: request or challenge identifier and response HTTP status.
- Persistence or transport: server certificate, response signature and returned license count.
- Security context: store commit result after a successful server response.
- Correlation point: content KID and license acquisition URL from the header.
A useful investigation order
- Locate the earliest API return, callback or event containing this result and
0xC00D277A. - Identify the exact content, license, store, device or migration object instance involved in “license header missing url”.
- Determine whether “license header missing url” occurred before network exchange, during response validation, while enforcing policy, or while committing protected state.
- Perform the code-specific check: capture the header version, KID and URL attributes.
- Make one targeted change — repackage the content with the correct acquisition metadata or supply the documented acquisition path — and repeat the same producing operation.
Targeted fix
To correct this, repackage the content with the correct acquisition metadata or supply the documented acquisition path.
Representative case: A protected file carries a KID but no endpoint from which rights can be requested.
What not to do first
- 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.
Nearby results with different meanings
| Result | Different condition |
|---|---|
NS_E_DRM_PROTOCOL_FORCEFUL_TERMINATION_ON_PETITION | The client process terminated while a DRM petition exchange was active. |
NS_E_DRM_PROTOCOL_FORCEFUL_TERMINATION_ON_CHALLENGE | The client process terminated while a license challenge was active. |
NS_E_DRM_POLICY_DISABLE_ONLINE | Administrative policy blocks WMDRM Internet or intranet access. |
Verification after correction
After the repair, recreate the WMDRM object and run the smallest reproducer. Confirm that 0xC00D277A 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 content header is missing an acquisition URL.” describes the visible condition but does not identify the producing API, object instance, or protected identity by itself.
Technical references
- Acquiring licenses — API and state rules relevant to this result.
- Handling license acquisition events — platform documentation used to distinguish this result from adjacent results.
- DRM protection and license distribution — official Windows Media DRM context.
- DRM client programming guide
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