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NS_E_DRM_INVALID_APPCERT
How to classify this result
The symbolic result NS_E_DRM_INVALID_APPCERT narrows 0xC00D277C to trusted playback path and output restrictions. In practical terms, the DRM application certificate is malformed, mismatched or cannot be validated; the producing layer is the protected playback path that authenticates application and driver components and enforces license requirements for audio, digital outputs, burning and other destinations.
Record certificate identity, chain/signature result and application binary hash.
How to prove the condition
- Locate the earliest API return, callback or event containing this result and
0xC00D277C. - Identify the exact content, license, store, device or migration object instance involved in “invalid appcert”.
- Determine whether “invalid appcert” occurred before network exchange, during response validation, while enforcing policy, or while committing protected state.
- Perform the code-specific check: record certificate identity, chain/signature result and application binary hash.
- Make one targeted change — deploy the correct application certificate and signed build — and repeat the same producing operation.
Diagnostic inputs that separate the causes
- Protected identity: protected-path renewal or component-validation event.
- Operation state: requested output and protection level.
- Persistence or transport: audio/video driver identity, signature and version.
- Security context: application certificate and revocation state.
- Correlation point: restriction-query result before playback or burn begins.
For the “invalid appcert” investigation, use KIDs, license IDs, hashes, certificate thumbprints, sizes and timestamps where possible. Do not place content keys, complete license blobs, passwords, cookies or decrypted media in ordinary logs.
Common but unsafe responses
- Avoid disabling driver or application authentication to force protected playback.
- Avoid interpreting an output-policy failure as proof that the license itself is corrupt.
What a supported fix should change
To correct this, deploy the correct application certificate and signed build. Preserve the original content/header, store or migration material until the “invalid appcert” operation succeeds and survives a fresh application object or required restart.
Representative case: A DRM-enabled module is updated without the certificate expected by the runtime.
Do not merge these HRESULTs
| Result | Different condition |
|---|---|
NS_E_DRM_RESTRICTIONS_NOT_RETRIEVED | The license you are using has associated output restrictions. This license is unusable until these restrictions are queried. |
NS_E_DRM_DEBUGGING_NOT_ALLOWED | The protected operation detects that its process is running under a debugger. |
NS_E_DRM_APPCERT_REVOKED | The application certificate is rejected by WMDRM revocation policy. |
How to know the fix is real
After the repair, recreate the WMDRM object and run the smallest reproducer. Confirm that 0xC00D277C no longer occurs, that the intended license action completes, and that no store, certificate, clock or migration warning replaces it.
Technical references
- Output protection levels — API and state rules for the DRM operation described here.
- Secure Audio Path model.
- Protected Media Path.
- DRM export and output protection — API and state rules for the DRM operation described here.
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