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NS_E_DRM_UNSUPPORTED_ALGORITHM
The exact DRM boundary
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 it 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. The proof step is to 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 |
|---|---|
| Owner | operation, API/callback, object or session identifier, and component/device version associated with it |
| Direct check | record the algorithm identifier from the header/license and client version |
| Policy input | requested action plus the exact license, certificate, profile, output or registration property evaluated by it |
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence it |
| Lower result | the earliest store, network, cryptographic, driver or provider status preceding the final it wrapper |
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 established fact is that the protected object names a cryptographic algorithm the client does not implement. That fact does not independently establish damaged media bytes, a missing decoder, a generally broken network, or invalid rights for every other action.
If the Player, encoder, setup program or device layer later emits a broader error, retain it as the first specific result. The object and operation attached to it are usually more diagnostic than a later cleanup or user-interface summary.
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 narrow correction for it: 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 for it: record the algorithm identifier from the header/license and client version.
- Repeat the same action with the same content/device identity and verify that it is not replaced by another policy or trust failure.
Change the rejected precondition
A matching correction is to use a supported algorithm or a client generation that implements the required one. Success means that the same requested action is accepted after that precise state change, not merely that another file or device happens to work.
- Evidence for it is easy to destroy; Do not replace DRM binaries or registry state before recording their versions and signatures; otherwise a component mismatch and a damaged license object become indistinguishable.
- Do not alter trusted time, revocation enforcement, certificate validation or output policy merely to suppress it; that bypasses the decision instead of correcting its input.
- Retain one failing artifact and one corrected artifact so the resolution of it can be regression-tested.
Closure criterion
For the final it test, keep the content KID or file hash, requested action, user/account, device identity and output route unchanged wherever they apply.
Technical references
- Windows Media DRM client interfaces — lists the security and state transitions used to interpret it.
- Digital Rights Management features — defines the platform objects used when diagnosing it.
- Licenses and the local license store — documents the protocol or API boundary behind it.
- Windows Media Format SDK error codes — provides the normative workflow relevant to it.
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