ISO/IEC 21617-1:2025 情報技術 — JPEG Trust — Part 1:コア基盤 | ページ 6

3.1

actor

actors

human or non-human (hardware or software) that is participating in the media ecosystem.

3.2

media asset

digital assets including images, videos, audio or text

3.3

media asset content

portion of a media asset (3.2) that represents the actual content, such as the pixel data of an image, along with any additional technical metadata required to understand or render the content (e.g. a colour profile or encoding parameters)

3.4

media asset metadata

portion of a media asset (3.2) that represents non-technical information about the media asset or its content, such as location, creator, annotations or IPR information

3.5

natural media asset

sensor acquired media asset

3.6

region of interest

ROI

subset within the media asset content (3.3) identified for a particular purpose

3.7

synthetic media asset

synthetically generated media asset

media asset (3.2) generated at least partially by a computer program

3.8

generative AI media asset

media asset (3.2) created by means of artificial intelligence (AI) and machine learning (ML)

3.9

JPEG 1

common image compression data format and means of reference to ISO/IEC 10918-1

3.10

digital master

master media asset as intended by its creator

3.11

manipulated media asset

manipulated media

media asset (3.2) that has been changed with the intention to induce misinterpretation

3.12

media asset original

media asset (3.2) produced by a device or method without any modifications

3.13

media asset provenance

set of information about a media asset (3.2) including the trail of modifications starting from an actor (3.1)

Note 1 to entry: Modifications that are missing from the asset’s provenance are treated the same as an invalid or unverifiable provenance chain.

3.14

media asset source

non-human actor (3.1) that created the media asset original (3.12)

3.15

modified media asset

media asset (3.2) that has been changed

3.16

assertion

data structure which represents a statement asserted by an actor (3.1) concerning the media asset (3.2)

Note 1 to entry: This data is a part of the trust manifest (3.19) .

3.17

claim

digitally signed and tamper-evident data structure that references one or more assertion (3.16) by one or more actors (3.1) , concerning a media asset (3.2) and the information necessary to represent the content_binding

Note 1 to entry: If any assertion was redacted, then a declaration to that effect is included. This data is a part of the trust manifest (3.19) .

3.18

claim signature

digital signature on the claim (3.17) using the private key of an actor (3.1)

Note 1 to entry: The claim_signature is a part of the trust manifest (3.19) .

3.19

trust manifest

set of information about the media asset provenance (3.13) of a media asset (3.3) . A trust manifest is part of a trust record (3.23)

3.20

trust declaration

specific type of trust manifest (3.19) that, when present, is always first in the trust record (3.21) . It represents the actor (3.1) that created the media asset (3.2) and contains only mandatory assertions

3.21

trust record

collection of one or more trust manifest (3.21) that can either be embedded into a media asset (3.2) or be external to its media asset

3.22

trust indicators

information derived from a combination of the media asset (3.2) and the trust record (3.21) that indicate a level of trustworthiness of a media asset in a given context

3.23

trust credential

the set of trust indicators (3.22) that are derived from a media asset (3.2) and its trust record (3.23)

3.24

trust profile

set of expressions that are used to evaluate each trust indicators (3.22) in a given trust credential (3.23) to indicate a level of trustworthiness for a given media asset (3.3)

3.25

trust report

result of evaluating a trust credential (3.23) against a trust profile (3.24)

3.26

authentic media asset

media asset (3.2) that is verifiable (3.27) or trustworthy (3.28) or both

3.27

verifiable

able to be checked

3.28

trustworthy

able to be relied on as being what it is asserted to be

3.29

media asset integrity

lack of corruption of a media asset (3.2)

3.30

registration

process of storing information (e.g. media asset, metadata or provenance) about a media asset (3.2) , separate from the media asset itself

3.31

signer

actor (3.1) who digitally signs a media asset (3.2)

3.32

signing

process that establishes the relation between an actor (3.1) and a media asset (3.2) in a tamper-evident manner

3.33

intellectual property rights

IPR

exclusive right of the actor (3.1) to the intellectual work of their creation

3.34

anonymization

process of altering data in a media asset with the aim to protect the privacy of an actor (3.1) by obscuring identifiable features

3.35

obfuscation

process of altering data in a media asset with the aim to protect unauthorized access

3.36

JUMBF

universal format to embed any type of metadata in any box-based JPEG file format and means of reference to ISO/IEC 19566-5