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Glossary
HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the energy
per surface unit becomes lower than the applicable exposure limit on the cornea or on the skin. The light beam
is considered (to be) unsafe for exposure if the distance from a person to the light source is less than the HD.
HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the energy
per surface unit becomes lower than the applicable exposure limit on the cornea or on the skin. The light beam
is considered (to be) unsafe for exposure if the distance from a person to the light source is less than the HD.
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 specifies 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.
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 certificate authority (CA), which issues digital certificates that
authenticate the identity of organizations and individuals over a public system such as the Internet. The
certificates are also used to sign messages, which ensures that messages have not been tampered with.
*.pem
Privacy-enhanced Electronic Mail. File format used to distribute digital signed certificates. Base64 encoded
DER
certificate,
enclosed
between
"———BEGIN
CERTIFICATE———"
and
"———END
CERTIFICATE———"
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 file, and
R5906787 /04
Thor series
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