What does HRESULT 0xC00D2749 (NS_E_DRM_INVALID_PROPERTY) mean?

Status / error code:

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Constant name:

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Description:

A required property was not set by the application. Contact product support for this application.%0.

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NS_E_DRM_LICENSE_UNUSABLE	NS_E_DRM_SECURE_STORE_NOT_FOUND

NS_E_DRM_INVALID_PROPERTY

Minimum incident record

Protected identity: property name, type, size and initialization order.
Operation state: operation state, callback sequence and cancellation owner.
Persistence or transport: first inner HRESULT before an application replaces it with a generic error.
Security context: exact interface method and object type being created.
Correlation point: SDK/runtime version and linked DRM stub library.

For the “invalid property” investigation, use KIDs, license IDs, hashes, certificate thumbprints, sizes and timestamps where possible. Do not place content keys, complete license blobs, passwords, cookies or decrypted media in ordinary logs.

Triage without destroying evidence

Start from 0xC00D2749 and map it to the first WMDRM object that returned it.
Separate content/header evidence, license evidence, machine/device evidence and service/network evidence around “invalid property”.
Before retrying this result, check whether another “invalid property” operation was active or whether the previous result may have committed partially.
Record the exact API, object state, input identity and first lower-level result associated with this failure.
Apply the smallest supported fix: correct the producing DRM state or input and retry with a fresh operation object; avoid resetting unrelated protected state.

Recovery at the right layer

The supported response to it is narrow: correct the producing DRM state or input and retry with a fresh operation object. After correcting it, reopen or recreate the object that owned “invalid property” so the verification does not reuse state from the failed operation.

Why the symbolic name matters

Result	Different condition
`NS_E_DRM_REOPEN_CONTENT`	The DRM component requires the protected file or stream to be reopened before continuing.
`NS_E_DRM_INVALID_APPDATA_VERSION`	Application-supplied DRM state uses an unsupported version.
`NS_E_DRM_INVALID_APPDATA`	Application-supplied DRM state data is malformed or fails validation.

Shortcuts that make diagnosis worse

Avoid retrying object creation in a loop without preserving the first HRESULT and runtime versions.

Technical references

DRM client interfaces.
DRM client programming guide — API and state rules for the DRM operation described here.
Obtaining the required DRM library.
Windows Media DRM error codes.

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