Glossary
Key Delivery Messag e (KDM)
The security key for each movie is delivere d in a unique KD M for each digital cinem a server. T he s ecurity key is encrypted within
the KDM, which m eans that the delivery of a KDM to the wrong server or wr ong location will not work, and thus such errors cannot
compromise the security of t he movie. The KD M is a small file, and is typically emailed to t he exhibitor. To create the correct set of
KDMs for a site requires knowledge of the digital certificate in the projection system ´s m edia block.
Public Key Infrastructure (PK I)
PKI is a framework for creating a secure method for exchanging information based on pu blic key c ryptography. The foundation of
a PKI is the certificate authority (CA), which issues digital certificates that authenticate the identity of organizations and individuals
over a public s ystem such as the Internet. The c ertificates are also u sed to sign mes sages, whic h ensures that mes sages have not
been tamp ered w ith.
RS232
An Electronic Industries Association (EIA) serial digital interface standard specifying the chara cteristics o f the communication path
between two devices us ing either D-SUB 9 pins or D-SU B 25 pins connectors. This standard is used for relatively short-range
communications and does not specify balanc ed control lines. RS-232 is a serial control standard with a set number of c onductors,
data rate, word length and type of connector to be us ed. The standard specifi es com ponent connection standards with regard to
computer interface. It is also ca lled 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 T DL 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 d ata sources: D evice manufacturers, Exhibitors, Deployment
Entities, Integrators, Service Providers (interacting with Exhibitors), regional authorities and Su pport.
USB
Universal S erial Bus (USB) is an industry standard developed in the mid-1990s that defines the cables, connectors and communica-
tions protocols used in a bus for connection, communication, and pow er supply between computers and electronic dev ices. USB 2.0
(also called "H i-Speed"), adding higher maxim um signaling rate of 480 Mbit/s (effectiv e t hroughput up to 35 M B/s or 280 Mbit/s), in
addition to the " USB 1.x Full Speed" signaling ra te of 12 Mbit/s.[16] USB 2.0 connectors are usually colored b lack. USB 3.0 defines
a new SuperSpeed mode w ith 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 U SB 2.0.
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R5906787 THOR 26/01/2018
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