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DP2K C
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DisplayPort
Digital display interface developed by the Video Electronics Standards Association (VESA). This royalty-free
interface is primarily used to connect a video source to a display device such as a computer monitor, though it
can also be used to transmit audio, USB, and other forms of data. VESA designed it to replace VGA, DVI, and
FPD-Link. Backward compatibility to VGA and DVI by using active adapter dongles enables users to use
DisplayPort fitted video sources without replacing existing display devices.
DVI
Digital Visual Interface is a display interface developed in response to the proliferation of digital flat panel
displays.
The digital video connectivity standard that was developed by DDWG (Digital Display Work Group). This
connection standard offers two different connectors: one with 24 pins that handles digital video signals only,
and one with 29 pins that handles both digital and analog video. This standard uses TMDS (Transition
Minimized Differential Signal) from Silicon Image and DDC (Display Data Channel) from VESA (Video
Electronics Standards Association).
DVI can be single or dual link.
HDCP
High-bandwidth Digital Content Protection is a form of digital copy protection developed by Intel Corporation to
prevent copying of digital audio and video content as it travels across DisplayPort, Digital Visual Interface
(DVI), High-Definition Multimedia Interface (HDMI), Gigabit Video Interface (GVIF), or Unified Display
Interface (UDI) connections, even if such copying would be permitted by fair use laws. The specification is
proprietary, and implementing HDCP requires a license.
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.
HDMI
HDMI (High-Definition Multimedia Interface) is a compact audio/video interface for transferring uncompressed
video data and compressed/uncompressed digital audio data from a HDMI-compliant device ("the source
device") to a compatible computer monitor, video projector, digital television, or digital audio device. HDMI is a
digital replacement for existing analog video standards.
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
is typically emailed to the exhibitor. To create the correct set of KDMs for a site requires knowledge of the
digital certificate in the projection system´s media block.
*.pem
Privacy-enhanced Electronic Mail. File format used to distribute digital signed certificates. Base64 encoded
DER
certificate,
enclosed
between
"———BEGIN
CERTIFICATE———"
and
"———END
CERTIFICATE———"
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.
Glossary
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