ISO/IEC TR 16501:1999 情報技術—一般的なデジタル視聴覚システム— ISO / IEC 16500に関するテクニカルレポート—デジタル視聴覚機能の説明 | ページ 5

3.1

Access Control

Provides means to access services and protection against the unauthorized interception of the services.

3.2

Access Network

a part of the Delivery system consisting of a collection of equipment and infrastructures, that link a number of Service Consumer Systems to the rest of the Delivery system through a single (or a limited number of) common port(s).

3.3

Application

a set of objects that provides an environment for processing Application Service Layer information flows.

3.4

Application Programming Interface

(API)

set of inter-layer service request and service response messages, message formats, and the rules for message exchange between hierarchical clients and servers. API messages may be executed locally by the server, or the server may rely on remote resources to provide a response to the client.

3.5

Assets

Things that a user sees or hears, e.g., bitmap, audio, and text.

3.6

Channel surfing

Viewing of many broadcast channels in a short time period by the End user.

3.7

Client

a service consuming object or system block); (a synonym for user)

3.8

Compliance to a contour

providing all of the system functions specified in a contour according to the mapping to ISO/IEC 16500 technologies specified in the corresponding annex of ISO/IEC 16500-3. See subclause 6.1.2

3.9

Conditional Access

A means of allowing system users to access only those services that are authorized to them.

3.10

Confidentiality

the protection of information from unauthorized disclosure

3.11

Conformance to a contour

providing system functions, as defined in a particular contour, used by the services in a system for which conformance is declared. See subclause 6.1.1

3.12

Content Provider

one who owns or is licensed to sell content.

3.13

Control Word

the secret key used for a scrambling algorithm.

3.14

Control-information

information that may change the state of the object intercepting the information flow, e.g., a remote control channel up command input. (In some cases an object may interpret a message but reject a request and remain in its current state.)

3.15

Distribution Network

a collection of equipment and infrastructures that delivers information flows from the Access Node to the Network Termination elements of the Access Network.

3.16

Email

Electronic mail. Email allows the sending of information in an electronic format from one Internet user to another. Users are identified on the Internet by a unique email address.

3.17

Entitlement Control Message

(ECM)

Conditional Access messages carrying an encrypted form of the control words or a means to recover the control words, together with access parameters, i.e., an identification of the service and of the conditions required for accessing this service.

3.18

Entitlement Management Message

(EMM)

Conditional Access messages used to convey entitlements or keys to users, or to invalidate or delete entitlements or keys.

3.19

FTP

File Transfer Protocol. FTP allows a connection to be made between two Internet computers in order to transfer files between them.

3.20

Function

Features of a Digital Audiovisual System that are realized through Services. For example, interactive play control VCR-type controls) is a function. (See also Service)

3.21

Hierarchy

an arrangement of objects in order of rank; some objects in the arrangement are subordinate to others; objects of the same hierarchical rank are peer objects

3.22

HTML

Elypertext Mark-up Language. HTML is a document formatting language used to specify the format of Hypertext documents on the World Wide Web. HTML consists of ASCII text files with special tags to specify formatting information. This includes the specification of Hypertext links, graphics information and plain text.

3.23

HTTP

Hypertext Transfer Protocol. HTTP is the protocol Web servers and browsers use to send request, accept request, send responses and receive response of documents on the World Wide Web. It also specifies how to initiate transfers of data using other protocols such as FTP and SMTP.

3.24

Hypertext

Hypertext is text that a user may select in some manner to cause some different set of information to be retrieved and displayed. A common example is a link on a Web page, which may be selected causing a new Web page to be retrieved.

3.25

Interface

a point of demarcation between two blocks through which information flows from one block to the other.. A DAVIC interface may be a physical-interface or a logical-interface.

3.26

Internet

The term Internet is used in many ways in this document. It is widely understood to mean the global network of computers tied together via different types of networks. These computers use a standard set of protocols to communicate, mainly TCP/IP and UDP/IP.

3.27

Key management

The generation, storage, distribution archiving, deletion, revocation, registration, and deregistration of cryptographic keys.

3.28

Navigation

the process of reaching a service objective by means of making successive choices; the term may be applied to the selection of a service category, a service provider or an offer within a particular service.

3.29

Network

a collection of interconnected elements that provides connection services to users

3.30

Network control function

The Network Control Function is responsible for the error-free receipt and transmission of content flow information to and from the Server.

3.31

Non-repudiation

the proof of the origin and reception of a message. This means that the sender cannot deny the sending of the message and the receiver cannot deny the reception of the message.

3.32

Partition

a decomposition or subdivision of an object into smaller objects; the created objects are peers with respect to each other, but are hierarchically subordinate to the original partitioned object

3.33

Peer

of the same rank or order: peer objects belong to the same layer (category or classification).

3.34

Physical interface

An interface where the physical characteristics of signals used to represent information and the physical characteristics of channels used to carry the signals are defined. A physical interface is an external interface. It is fully defined by its physical and electrical characteristics. Logical information flows map to signal flows that pass through physical interfaces.

3.35

Plane

a category that identifies a collection of related objects, e.g., objects that execute similar or complementary functions; or peer objects that interact to use or to provide services in a class that reflects authority, capability, or time period. Management-plane service objects, for example, may authorize ISP-clients' access to certain control-plane service objects that in turn may allow the clients to use services provided by certain user-plane objects.

3.36

Privacy

privacy protects authorized participants from illegal utilization or knowledge of information related to their components in the DAVIC System

3.37

Protocol

set of message formats (semantic, syntactic, and symbolic rules) and the rules for message exchange between peer layer entities (which messages are valid when)

3.38

Real-time

Quality of a process, the execution of which is determined or controlled in time. The term is sometimes extended to refer to a delivery process which is perceived fast enough to be considered as almost instantaneous.

3.39

Reference point

a set of interfaces between any two related blocks through which information flows from one block to the other. A reference point comprises one or more logical non-physical) information-transfer interfaces, and one or more physical signal-transfer interfaces.

3.40

Server

any service providing system.

3.41

Service provider

an entity that provides a service to a client.

3.42

Session

an interval during which a logical, mutually agreed correspondence between two objects exists for the transfer of related information. A session defines a relationship between the participating users in a service instance.

3.43

Specification

a definition of the requirements of a system. A specification consists of general parameters required of the system and the functional specification of its required behavior. Specification may also be used as shorthand for specification and/or description, e.g., in SDL specification or system specification.

3.44

Symbol

a bit or a defined sequence of bits.

3.45

System

a collection of interacting objects that serves a useful purpose; typically, a primary subdivision of an object of any size or composition (including domains)

3.46

User

a service consuming object or system

3.47

Virtual channel

communication channel that provides for the sequential unidirectional transport of ATM cells