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NS_E_DRM_UNSUPPORTED_ALGORITHM
The exact DRM condition
This HRESULT is specific: NS_E_DRM_UNSUPPORTED_ALGORITHM appears because the protected object names a cryptographic algorithm the client does not implement. This result comes from Windows Media DRM client internals, whose state machine implements the client DRM engine that initializes security components, validates content and license identifiers, performs individualization, manages license chains and coordinates protected playback capabilities.
Use the failing operation itself to record the algorithm identifier from the header/license and client version.
What to log
The object graph behind this result includes DRM component version, KID, content header signature, license chain, uplink license, individualization state, portable-device registrations and local configuration. A trace should retain the KID and header hash, DRM component version, individualization status, license-chain identifiers, registry/configuration lookup and the first client callback reporting failure.
That observation distinguishes this result from file corruption because the protected object names a cryptographic algorithm the client does not implement.
Expected state change
Reconstruct the transition from the requested action to the rejected condition. To verify this, record the algorithm identifier from the header/license and client version; the repaired transition must then use a supported algorithm or a client generation that implements the required one. Record the first lower-layer status beside it because wrapper HRESULTs can otherwise conceal the producing component.
Fields for a reproducible report
| Field | Value |
|---|---|
| Direct check | record the algorithm identifier from the header/license and client version |
Related codes, different contracts
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_LICENSE_INITIALIZATION_ERROR | the DRM engine could not initialize the license object or license subsystem for this operation |
NS_E_DRM_CHAIN_TOO_LONG | a proposed chained license uses another chained license as its uplink, exceeding the supported chain depth |
NS_E_DRM_LICENSE_DELETION_ERROR | the DRM engine failed while removing a license from its managed store |
Scope and consequences
The protected object names a cryptographic algorithm the client does not implement.
Troubleshooting order
- Preserve it and
0xC00D284Dbefore cleanup, fallback or another media item changes the context. - Compare the failure with a known-good case that changes only the property named by this condition: the protected object names a cryptographic algorithm the client does not implement.
- Apply the targeted fix: use a supported algorithm or a client generation that implements the required one.
- Associate it with its current Windows Media DRM client internals object and the requested action.
- Run the direct check: record the algorithm identifier from the header/license and client version.
Change the rejected precondition
A matching correction is to use a supported algorithm or a client generation that implements the required one.
- Preserve the evidence before making changes.
Technical references
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