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IBM, and NEC The resulting Digital Visual Interface (DVI) specification, released in April 1999, was based on Silicon Image s panelLink technology DVI quickly gained wide acceptance as the new industry standard for lowcost, high-speed digital links to video displays DVI supports 1600 1200 (UXGA) resolution, which covers all the HDTV resolutions Even higher resolution can be supported with dual links Contemporary IEEE 1394 implementations are limited to 40 Mbps, which is plenty for compressed MPEG video but not in the same league with DVI s 495 Gbps Many new HDTV displays are likely to have both IEEE 1394 and DVI connections Intel proposed a security component for DVI: High-Bandwidth Digital Content Protection (HDCP) HDCP provides authentication, encryption, and revocation Special hardware on the video adapter card and the display monitor encrypts video data before it is sent over the link HDCP is not mandatory, and early DVI monitors were released before HDCP was ready When an HDCP-equipped DVI card senses that the connected monitor does not support HDCP, it lowers the image quality of protected content HDCP is key to winning Hollywood support for high-definition movies on computers and other digital display systems CSS allows unprotected VGA output of DVD content, which is worrisome enough to studio executives The HDCP key exchange process verifies that a receiving device is authorized to display or record video It uses an array of forty, 56-bit secret device keys and a 40-bit key selection vector all supplied by the HDCP licensing entity If the security of a display device is compromised, its key selection vector is placed on the revocation list The host device has the responsibility of maintaining the revocation list, which is updated by system renewability messages (SRMs) carried by newer devices and by video content Once the authority of the receiving device has been established, the video is encrypted by an XOR operation with a stream cipher generated from keys exchanged during the authentication process If a display device with no decryption ability attempts to display encrypted content, it appears as random noise Summary of Content Protection Schemes All the various copy protection implementations are optional for the producer of a disc If someone wishes to protect content on a disc, he or she can choose to apply APS, CSS, CPPM, or watermarking; a combination of more than one is usually applied It is possible to use APS (Macrovision) without CSS, but it is easy to circumvent the APS trigger bits if the content is not protected with CSS Therefore, Macrovision is almost always combined with CSS
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Figure 47 Copy protection system architecture
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Figure 48 Scope of copy protection system architecture
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CPRM encryption is performed automatically by DVD recorders DTCP and HDCP are handled by the DVD player or computer, not by the disc developer As long as the developer has included CMI with the content, it will be honored or passed along by the digital output protection system CSS, CPPM, and CPRM decryption are optional for hardware and software player manufacturers; a player or computer without decryption capability can play only unencrypted discs Watermarking is being retrofitted into the CSS and CPPM licenses so that future compliant devices will be required to check for watermarking in unencrypted content See Figure 49 for an overview of the content protection chain Ramifications of Copy Protection All these copy protection schemes are designed to guard against casual copying, which the studios claim causes billions of dollars in lost revenue The goal is to keep the honest people honest The people who developed the copy protection measures are the first to admit that they will not stop well-equipped pirates or even determined consumers Video pirates have equipment that can easily make complete bitby-bit copies of discs or create identical master copies for mass replication Bit-by-bit copiers are available to computer owners who know where to look Movie studios began promoting legislation in 1994 that would make it illegal to defeat technical copy protection measures The result is the World Intellectual Property Organization (WIPO) Copyright Treaty, the WIPO Performances and Phonograms Treaty (December 1996), and the
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