ISO/IEC 23001-7:2016
Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files
ISO/IEC 23001-7:2016 specifies common encryption formats for use in any file format based on ISO/IEC 14496‑12. 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 part of ISO/IEC 23001 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.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
4 Protection schemes
4.1 Scheme type signaling
4.2 Common encryption scheme types
5 Overview of encryption metadata
6 Encryption parameters shared by groups of samples
7 Common encryption sample auxiliary information
7.1 Definition
7.2 Sample Encryption Information box for storage of sample auxiliary information
7.2.1 Sample Encryption Box (‘senc’)
7.2.2 Syntax
7.2.3 Semantics
8 Box definitions
8.1 Protection system specific header box
8.1.1 Definition
8.1.2 Syntax
8.1.3 Semantics
8.2 Track Encryption box
8.2.1 Definition
8.2.2 Syntax
8.2.3 Semantics
9 Encryption of media data
9.1 Field semantics
9.2 Initialization Vectors
9.3 AES-CTR mode counter operation
9.4 Full sample encryption
9.4.1 General
9.4.2 Full sample encryption using AES-CTR mode
9.4.3 Full sample encryption using AES-CBC mode
9.5 Subsample encryption
9.5.1 Definition (normative)
9.5.2 Subsample encryption of NAL Structured Video tracks
9.6 Pattern encryption
9.6.1 Definition
9.6.2 Example of pattern encryption applied to a video NAL unit
9.7 Whole-block full sample encryption
10 Protection scheme definitions
10.1 ‘cenc’ AES-CTR scheme
10.2 ‘cbc1’ AES-CBC scheme
10.3 ‘cens’ AES-CTR subsample pattern encryption scheme
10.4 ‘cbcs’ AES-CBC subsample pattern encryption scheme
10.4.1 Definition
10.4.2 ‘cbcs’ AES-CBC mode pattern encryption scheme application (informative)
11 XML representation of Common Encryption parameters
11.1 General
11.2 Definition of the XML cenc:default_KID attribute and cenc:pssh element
11.3 Use of the cenc:default_KID attribute and cenc:pssh element in DASH ContentProtection Descriptor elements
11.3.1 General
11.3.2 Addition of cenc:default_KID attributes in DASH ContentProtection Descriptors
11.3.3 Addition of the cenc:pssh element in Protection System Specific UUID ContentProtection Descriptors
11.3.4 Example of two Content Protection Descriptors in an MPD
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
4 Protection schemes
4.1 Scheme type signaling
4.2 Common encryption scheme types
5 Overview of encryption metadata
6 Encryption parameters shared by groups of samples
7 Common encryption sample auxiliary information
7.1 Definition
7.2 Sample Encryption Information box for storage of sample auxiliary information
7.2.1 Sample Encryption Box (‘senc’)
7.2.2 Syntax
7.2.3 Semantics
8 Box definitions
8.1 Protection system specific header box
8.1.1 Definition
8.1.2 Syntax
8.1.3 Semantics
8.2 Track Encryption box
8.2.1 Definition
8.2.2 Syntax
8.2.3 Semantics
9 Encryption of media data
9.1 Field semantics
9.2 Initialization Vectors
9.3 AES-CTR mode counter operation
9.4 Full sample encryption
9.4.1 General
9.4.2 Full sample encryption using AES-CTR mode
9.4.3 Full sample encryption using AES-CBC mode
9.5 Subsample encryption
9.5.1 Definition (normative)
9.5.2 Subsample encryption of NAL Structured Video tracks
9.6 Pattern encryption
9.6.1 Definition
9.6.2 Example of pattern encryption applied to a video NAL unit
9.7 Whole-block full sample encryption
10 Protection scheme definitions
10.1 ‘cenc’ AES-CTR scheme
10.2 ‘cbc1’ AES-CBC scheme
10.3 ‘cens’ AES-CTR subsample pattern encryption scheme
10.4 ‘cbcs’ AES-CBC subsample pattern encryption scheme
10.4.1 Definition
10.4.2 ‘cbcs’ AES-CBC mode pattern encryption scheme application (informative)
11 XML representation of Common Encryption parameters
11.1 General
11.2 Definition of the XML cenc:default_KID attribute and cenc:pssh element
11.3 Use of the cenc:default_KID attribute and cenc:pssh element in DASH ContentProtection Descriptor elements
11.3.1 General
11.3.2 Addition of cenc:default_KID attributes in DASH ContentProtection Descriptors
11.3.3 Addition of the cenc:pssh element in Protection System Specific UUID ContentProtection Descriptors
11.3.4 Example of two Content Protection Descriptors in an MPD
Bibliography