What does HRESULT 0xC00D28A7 (NS_E_DRM_MUST_REVALIDATE) mean?

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Description:

The client must be revalidated before executing the intended operation.%0

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NS_E_DRM_MUST_APPROVE	NS_E_DRM_INVALID_PROXIMITY_RESPONSE

NS_E_DRM_MUST_REVALIDATE

Meaning in the active workflow

The first actionable fact in NS_E_DRM_MUST_REVALIDATE is that the receiver registration exists but its proximity validation is stale or no longer acceptable. Diagnosis of this result therefore starts in WMDRM for Network Devices, the layer responsible for the transmitter/receiver protocol that registers a network playback device, approves it, validates proximity, opens a protected session and transcrypts licensed content for that receiver.

The strongest confirmation is to record last-validation time and validation-status flags.

Preserve the original generation

The security decision represented by this result depends on device certificate and serial number, registration-database entry, approval flag, validation timestamp, network session, protocol message and transcrypt policy. Record the exact WMDRM-ND message type, device identifier, certificate chain, registration state, round-trip timing and the first protocol HRESULT from the same attempt.

This evidence matters because the rejected condition is specifically that the receiver registration exists but its proximity validation is stale or no longer acceptable.

Failure model

The before/after comparison has one controlled variable. Before correction, the receiver registration exists but its proximity validation is stale or no longer acceptable; after correction, the same workflow can perform a new proximity-detection exchange before opening content. The result comparison should preserve content and device identity so success cannot be attributed to testing a different asset.

Diagnostic checklist

Field	Value
Policy input	requested action plus the exact license, certificate, profile, output or registration property evaluated by this result
Direct check	record last-validation time and validation-status flags

Confirm the condition

Preserve it and 0xC00D28A7 before cleanup, fallback or another media item changes the context.
Apply the targeted fix: perform a new proximity-detection exchange before opening content.
Associate it with its current WMDRM for Network Devices object and the requested action.
Run the direct check: record last-validation time and validation-status flags.
Compare the failure with a known-good case that changes only the property named by this condition: the receiver registration exists but its proximity validation is stale or no longer acceptable.

What remains unknown

The receiver registration exists but its proximity validation is stale or no longer acceptable.

Compare neighboring states

Result	Why it points elsewhere
`NS_E_DRM_MUST_REGISTER`	the receiver has no valid entry in the transmitter registration database
`NS_E_DRM_MUST_APPROVE`	the receiver is registered but lacks the user approval required before content transfer
`NS_E_DRM_INVALID_PROXIMITY_RESPONSE`	the receiver returned a proximity response that fails parsing or cryptographic verification

Operational response

Repair the owner of the check: perform a new proximity-detection exchange before opening content.

Preserve the evidence before making changes.

Technical references

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