ISO/IEC 23001-7:2023 情報技術 — MPEG システム技術 — Part 7: ISO ベースのメディア ファイル形式ファイルにおける共通の暗号化 | ページ 6

3.1.1

block

16-byte extent of sample data that may be encrypted or decrypted by AES-128 block cipher

Note 1 to entry: This is commonly known as a cipher block .

3.1.2

CENC SAI

sample auxiliary information associated with a sample and containing cryptographic information such as initialization vector or subsample information

Note 1 to entry: The sample auxiliary information is defined in ISO/IEC 14496-12 , and is not part of the sample data .

3.1.3

constant IV

initialization vector specified in a sample entry or sample group description that applies to all samples and subsamples under that sample entry or mapped to that sample group

3.1.4

initialization vector

8 or 16-byte value used in combination with a key and a block to create the first cipher block in a chain, and derive subsequent cipher blocks in a cipher block chain

3.1.5

NAL unit

syntax structure containing an indication of the type of data to follow and bytes containing that data in the form of an RBSP interspersed as necessary with emulation prevention bytes

3.1.6

NAL structured video

video streams composed of NAL Units

Note 1 to entry: The carriage of NAL Units is specified in ISO/IEC 14496-15

3.1.7

protection scheme

encryption algorithm and information identified by the scheme_type in a SchemeTypeBox in a ProtectionSchemeInfoBox

3.1.8

sample

media sample when the protection applies to media tracks, or the payload of an item when the protection applies to items

Note 1 to entry: Media sample as defined in ISO/IEC 14496-12.

Note 2 to entry: Payload of an item as defined in ISO/IEC 14496-12.

3.1.9

selective encryption

change in the isProtected value of samples associated with the same sample description entry

Note 1 to entry: This is achieved using CencSampleEncryptionInformationGroupEntry sample groups.

3.1.10

subsample

byte range within a sample consisting of an unprotected part immediately followed by a protected part