HD-DVD
Launched by NEC and Toshiba, the HD DVD is physically close to the current DVD (thickness of 0.6 mm for the substrate and the protective layer), apart from the use of a Laser blue.
It has a capacity of 15 GB per side per layer for the read-only media, and 20 GB rewritable discs. By providing a physical structure close to that of DVD, NEC and Toshiba seek a smooth transition from one technology to another between 2005 and 2010.
HDCP
Acronym meaning High Bandwidth Digital Content Protection. System of copyright protection (right to copy) implemented by the major U.S. film studios to prevent the identical copy of a film or Issue via a digital connection type DVI or HDMI. By encoding the image output of a reader DVD or decoder HDTVIt blocks any attempted fraud on the part of the user.
HDLC
Protocol Level 2 (Data Link) Used especially in Transpac.
Hardware
All physical elements used for data processing.
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