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Validating keying material by using a validation area of read-only media to prevent playback of unauthorized copies of content stored on the media
Validating keying material by using a validation area of read-only media to prevent playback of unauthorized copies of content stored on the media
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机译:通过使用只读媒体的验证区域来验证密钥资料,以防止播放存储在媒体上的未经授权的内容副本
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摘要
In one aspect of the invention is a method for preventing unauthorized copies of a medium, such as a DVD, from being played by a compliant device by using the validation area (VA) region of a medium to validate keying material. A compliant device is a device that will validate keying material. In one embodiment of the invention, a compliant device validates keying material by using the value in the VA region of the medium. In alternative embodiments, a compliant device will validate keying material by checking correspondence between keying material written to a non-VA region of a medium and validation data written to a VA region of a medium. In the alternative embodiments, if the keying material does not correspond to the validation data, then a compliant device will prevent the contents of the medium from being played.
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