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NS_E_WMP_INVALID_KEY
Diagnosing NS_E_WMP_INVALID_KEY in the Windows Media Player playback path
NS_E_WMP_INVALID_KEY (0xC00D11CE) is returned when a codec or protected media component supplied a key or key-associated object that failed validation.
Preserve the component that supplied the rejected key and the protected-content operation in progress. Replacing codecs or clearing Player state without identifying that producer can erase the only useful trust-boundary evidence.
Controlled playback comparison
- Capture the resource identity and owning component, key identifier and length, content header, codec signature, revocation state and nested DRM/codec result.
- Verify that the caller uses the current Playlist, Media, Network, graph, device or DRM object instance.
- Run the narrow experiment: test an unprotected known-good stream through the same codec, then compare the protected or keyed path.
- Do not combine this focused test with a codec-pack change, Player reset, or broad registry cleanup.
- If the retest returns a different specific HRESULT, diagnose that new failure as the next stage.
Actions that obscure the cause
- publishing key material in diagnostic logs.
Technical references
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