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Cablecard will not allow a subscriber to receive TV Guide services, Pay Per View, or Video on Demand due to the one-way nature of the CableCARD device's function.
HDMI supports standard, enhanced, or high-definition video plus standard to multi-channel surround-sound audio. HDMI benefits include uncompressed digital video, a bandwidth of up to 5 gigabytes per second, one connector instead of several cables and connectors, and communication between the video source and the DTV. HDMI development is overseen by the HDMI Working Group that includes Sony, Hitachi, Silicon Image, Philips, and Toshiba as members.
HDMI will replace DVI eventually for Home Theater connectivity. Point to point interface - connects only two devices at a time.
Video is compatible with HDMI provided both devices are HDCP compatible. DVI carries uncompressed video data, but no audio. Point to point interface - connects only two devices at a time.
This type of connection is used on some HDTV's, Projectors, Set Top Boxes and Receivers. DVI cables are usually only available in limited length. DVI will be replaced by HDMI for Home Theater applications.
Whether or not it will actually work or not requires a bit more complex of an answer due to HDCP. It is meant to prevent viewers from copying content they are not "allowed" to copy. (see definition of HDCP in this FAQ)
HDMI connectors all use HDCP. DVI connections on the other hand, may or may not have HDCP. Computers and LCD monitors for example, can have DVI connections which do not have, or "need" HDCP. Many of the early HDTV's to include DVI connectors do not have HDCP. Some projectors, especially non-Home Theater oriented ones with DVI connectors do not have HDCP. Generally you will need to be sure that both devices use HDCP in order to connect together an HDMI device and a DVI device.