Method and system for transferring information using an encryption mode indicator
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United States of America Patent
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Feb 13, 2007
Issued Date -
N/A
app pub date -
Sep 18, 2000
filing date -
Oct 24, 1997
priority date (Note) -
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Abstract
A method and system for transferring information using an encryption mode indicator (EMI). The present invention provides several secure information communication modes in which data (e.g., representing an audio/visual work) can be transmitted from a source device to a sink device (receiving station) in a number of secure modes. In one secure mode, EMI mode A, the information of the transmission is not allowed to be copied as a whole work; this is the highest level of copy protection. In second secure mode, EMI mode B, the information of the transmission is allowed to be copied once and once only by the sink device. In a third transmission mode, no encryption is used and free copying is available.
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