M00019437
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ISO/IEC DIS 23001-7 2015 Edition, February 9, 2015 INFORMATION TECHNOLOGY - MPEG SYSTEMS TECHNOLOGIES - PART 7: COMMON ENCRYPTION IN ISO BASE MEDIA FILE FORMAT FILES
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Availability date: 07/14/2021
Description / Abstract:
Part 7 of ISO/IEC 23001 specifies common encryption formats for
use in any file format based on ISO/IEC 14496-12, ISO Base Media
File Format. File, track, and track fragment metadata is specified
to enable multiple digital rights and key management systems (DRMs)
to access the same common encrypted file or stream. This standard
does not define a DRM system.
The AES-128 symmetric block cipher is incorporated by reference
to encrypt elementary stream data contained in media samples. Both
AES counter mode (CTR) and Cipher Block Chaining (CBC) are
specified in separate protection schemes. Partial encryption using
a pattern of encrypted and clear blocks is also specified in
separate protection schemes. The identification of encryption keys,
Initialization Vector storage and processing is specified for each
scheme.
Subsample encryption is specified for NAL structured video, such
as AVC and HEVC, to enable normal processing and editing of video
elementary streams prior to decryption.
An XML representation is specified for important common
encryption information so that it can be included in XML files as
standard elements and attributes to enable interoperable license
and key management prior to media file download.