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NS_E_DRM_CHAIN_TOO_LONG
What the caller learned
Read NS_E_DRM_CHAIN_TOO_LONG at the object boundary, where a proposed chained license uses another chained license as its uplink, exceeding the supported chain depth. The subsystem producing this result is Windows Media DRM client internals, not the media decoder; it performs the client DRM engine that initializes security components, validates content and license identifiers, performs individualization, manages license chains and coordinates protected playback capabilities.
The investigation becomes concrete when you walk the UplinkKid relationship and count root versus leaf levels.
State that must remain correlated
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.
This evidence matters because the rejected condition is specifically that a proposed chained license uses another chained license as its uplink, exceeding the supported chain depth.
Narrow the failure
- Preserve this result and
0xC00D284Cbefore cleanup, fallback or another media item changes the context. - Apply the targeted fix: issue the leaf directly from an unchained root license.
- Associate it with its current Windows Media DRM client internals object and the requested action.
- Run the direct check: walk the UplinkKid relationship and count root versus leaf levels.
- Compare the failure with a known-good case that changes only the property named by this condition: a proposed chained license uses another chained license as its uplink, exceeding the supported chain depth.
State transition
The before/after comparison has one controlled variable. Before correction, a proposed chained license uses another chained license as its uplink, exceeding the supported chain depth; after correction, the same workflow can issue the leaf directly from an unchained root license. The result model is suitable for a regression fixture because its expected state change is observable without weakening the DRM policy.
Do not overread the HRESULT
A proposed chained license uses another chained license as its uplink, exceeding the supported chain depth.
Capture before retry
| Field | Value |
|---|---|
| Direct check | walk the UplinkKid relationship and count root versus leaf levels |
Similar symptoms are not identical
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_INVALID_KID | the supplied key identifier is malformed or not valid for the DRM operation |
NS_E_DRM_LICENSE_INITIALIZATION_ERROR | the DRM engine could not initialize the license object or license subsystem for this operation |
NS_E_DRM_UNSUPPORTED_ALGORITHM | the protected object names a cryptographic algorithm the client does not implement |
A real fix
The next attempt becomes meaningful only after you issue the leaf directly from an unchained root license.
Technical references
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