Information recording medium, recording apparatus, information transmission system, and decryption apparatus
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United States of America Patent
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Nov 7, 2000
Grant Date -
N/A
app pub date -
Feb 6, 1998
filing date -
Feb 7, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
In the invention, an information recording medium records encrypted information, encrypted key information obtained by encrypting key information for decrypting the encrypted information to obtain original information, and non-encrypted condition information used upon decrypting the encrypted information and recorded in the encrypted key information, and the encrypted information from the information recording medium is decrypted inside an IC card using the encrypted key information and condition information. Upon decrypting the encrypted information from the information recording medium, information that requires security protection or copyright protection can be prevented from being illicitly copied.
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