High-Bandwidth Digital Content Protection
From TPU Reference
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liacchilet High-Bandwidth Digital Content Protection (HDCP) is a digital rights management system (copy protection) for digital A/V signals.
As of version 1.2 HDCP can be implemented for DVI and HDMI links. Making an HDCP compliant product is not free, companies have to get a license from Digital Content Protection, LLC, an Intel company.
HDCP offers several layers of security:
- Authentication of peer devices. If a receiver does not authenticate properly, the sender will not send HD content.
- Encrypted transfers. All data sent over the wire is encrypted, to protect from people copying content by "hooking" into the cable.
- Key revoking. If a manufacturer loses his HDCP license by violating the agreement, his key can be declared invalid.
Several weaknesses have been found, for example A Cryptanalysis of the High-bandwidth Digital Content Protection System.
- If a television set says "HD Ready", it can authenticate to HDCP content.
- Not all televisions require HDCP to play back computer signals, not even at HD resolutions. See the list at the bottom.
- HD-DVD and Blu-ray Disc players will query connected output devices for HDCP support if HD content is played back. If HDCP is not supported, the player will internally downsample the image to 480p.
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TVs that accept HD input without HDCP
This list is incomplete, please add yours.
- Panasonic TH42-PV60E: No HDCP required on any input in any resolution.
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