Specifications

Crestron DigitalMedia™ Design Guide
48 Check website (www.crestron.com) for product availability
Encoding Terminology
AC-3
This digital surround sound format for home audio is called Dolby Digital in theaters. It is a 5:1 format, with six separate audio
tracks. AC-3 has been chosen as the official sound format for digital TV and is commonly used to encode DVD soundtracks.
Authentication
Authentication ensures that digital data transmissions are delivered to the intended receiver. Authentication also assures the
receiver of the integrity of the data and its source. The simplest form of authentication requires a username and a password
to gain access to a particular account. But authentication protocols can also be based on secret key encryption, such as DES,
or on public key systems using digital signatures.
DRM
Digital Rights Management is a secure technology that enables the copyright owner of a piece of intellectual property (such as
a music, video, or text file) to specify what a user can do with it. Typically, this is used to offer downloads that can't be played
or burned to CD without paying for a license.
HDCP
High-bandwidth Digital Content Protection. A copy protection scheme developed by Intel used in conjunction with DVI and
HDMI connections.
KSV
A set of numbers transmitted between HDCP-protected sources and sinks during the authentication ‘handshake’ to validate
that the devices are authorized to receive the content. Some HDMI sources have limited buffer space to hold KSVs and as such
can only be routed to a few HDMI devices before their buffer overflows and content playback stops.