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STATUS_CSS_KEY_NOT_PRESENT
The requested CSS key is absent at the current DVD operation boundary
STATUS_CSS_KEY_NOT_PRESENT is a DVD copy-protection result tied to key-bearing media data, not a generic cryptographic “key not found” condition. Windows exposes DVD structure and key operations separately: IOCTL_DVD_READ_STRUCTURE retrieves descriptors such as the disc-key structure, while IOCTL_DVD_READ_KEY reports key material selected through DVD_KEY_TYPE.
The status description specifically refers to a sector that does not contain a valid key. Preserve the logical block or sector associated with the failed operation and the key type requested. A title-key request against the wrong location, stale title boundaries, or software that assumes every protected read has the same key context should be distinguished from a complete CSS authentication failure.
Do not repair this by changing the drive region or repeatedly allocating new AGIDs without evidence. Region state and authentication-session state have their own interfaces and NTSTATUS values. First establish whether the expected key exists for the exact media location and operation that the class driver was asked to perform.
What to inspect
- The sector or logical block address and the
DVD_KEY_TYPEused by the failing request. - The preceding DVD structure/key requests and whether the application crossed a title or media boundary.
- Whether the failure is reproducible at one location or follows every CSS key request on the disc.
References
- Microsoft: IOCTL_DVD_READ_KEY
- Microsoft: DVD_KEY_TYPE
- Microsoft: DVD_COPY_PROTECT_KEY
- Microsoft: IOCTL_DVD_READ_STRUCTURE
- Microsoft Open Specifications: NTSTATUS values
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