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Glossary
Key Delivery Message (KDM)
The security key for each movie is delivered in a unique KDM for each digital cinema server. The security key is encrypted within
the KDM, which means that the delivery of a KDM to the wrong server or wrong location will not work, and thus such errors cannot
compromise the security of the movie. The KDM is a small
fi le, and is typically emailed to the exhibitor. To create the correct set of
KDMs for a site requires knowledge of the digital certi fi cate in the projection system´s media block.
Public Key Infrastructure (PKI)
PKI is a framework for creating a secure method for exchanging information based on public key cryptography. The foundation of
a PKI is the certi
fi cate authority ( CA ), which issues digital certi fi cates that authenticate the identity of organizations and individuals
over a public system such as the Internet. The certi fi cates are also used to sign messages, which ensures that messages have not
been tampered with.
RS232
An Electronic Industries Association (EIA) serial digital interface standard specifying the characteristics of the communication path
between two devices using either D-SUB 9 pins or D-SUB 25 pins connectors. This standard is used for relatively short-range
communications and does not specify balanced control lines. RS-232 is a serial control standard with a set number of conductors,
data rate, word length and type of connector to be used. The standard speci
fi es component connection standards with regard to
computer interface. It is also called RS-232-C, which is the third version of the RS-232 standard, and is functionally identical to the
CCITT V.24 standard. Logical ’0’ is > + 3V, Logical ’1’ is < - 3V. The range between -3V and +3V is the transition zone.
Trusted Device List (TDL)
The Goal of the TDL is to maintain timely and accurate information on participating auditoriums so that participating subscribers
can obtain information needed to issue KDMs. The TDL has several data sources: Device manufacturers, Exhibitors, Deployment
Entities, Integrators, Service Providers (interacting with Exhibitors), regional authorities and Support.
USB
Universal Serial Bus (USB) is an industry standard developed in the mid-1990s that de fi nes the cables, connectors and communica-
tions protocols used in a bus for connection, communication, and power supply between computers and electronic devices. USB 2.0
(also called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), in
addition to the "USB 1.x Full Speed" signaling rate of 12 Mbit/s.[16] USB 2.0 connectors are usually colored black.
USB 3.0 de fi nes
a new SuperSpeed mode with a signaling speed of 5 Gbit/s and a usable data rate of up to 4 Gbit/s (500 MB/s). A USB 3.0 port is
usually colored blue, and is backwards compatible with USB 2.0.
70 R5906787 THOR 26/01/2018