mf-pd-asf-contentencryption-keyid-attribute.md

description	ms.assetid	title	ms.topic	ms.date
Specifies the key identifier for an encrypted Advanced Systems Format (ASF) file. This attribute corresponds to the Key ID field of the Content Encryption Header, defined in the ASF specification.	ebadd156-28f4-499c-a182-f48a35ecbefb	MF_PD_ASF_CONTENTENCRYPTION_KEYID attribute (Wmcontainer.h)	reference	05/31/2018

MF_PD_ASF_CONTENTENCRYPTION_KEYID attribute

Specifies the key identifier for an encrypted Advanced Systems Format (ASF) file. This attribute corresponds to the Key ID field of the Content Encryption Header, defined in the ASF specification.

Data type

Wide-character string

Remarks

This attribute applies to presentation descriptors for ASF content.

The IMFASFContentInfo::GeneratePresentationDescriptor method retrieves the Key ID field, converts it into a wide-character string, and then populates a null-terminated array of WCHARs. The size of the array equals the Key ID Length field of the Content Encryption Header.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Header	Wmcontainer.h

See also

Alphabetical List of Media Foundation Attributes

IMFAttributes::GetString

IMFAttributes::SetString

IMFPresentationDescriptor

Presentation Descriptor Attributes

ASF Header Object

Presentation Descriptors