// dxva.h

typedef struct _DXVA_COPPSignature {
  UCHAR Signature[256];
} DXVA_COPPSignature, *LPDXVA_COPPSignature;
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Windows Driver Kit DDI reference (ns-dxva-_dxva_coppsignature)

_DXVA_COPPSignature structure

Description

The DXVA_COPPSignature structure describes a sequence of items concatenated together that starts an active protected video session.

Members

`Signature`

Specifies an array for the concatenated sequence of items.

Remarks

The DXVA_COPPSignature structure is passed in the pSeqStartInfo parameter of the COPPSequenceStart function.

The array at Signature consists of the following items concatenated together:

128-bit random number generated by the driver and returned through a call to the driver's COPPKeyExchange function
128-bit random data integrity session key
32-bit random starting status sequence number
32-bit random starting command sequence number

LPDXVA_COPPSignature - NtDoc