Digital work protection system, recording medium apparatus, transmission apparatus, and playback apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
N/A
Issued Date -
Jan 9, 2003
app pub date -
Jun 26, 2002
filing date -
Jul 9, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A server apparatus encrypts content, based on a distribution key, and transmits the encrypted content to a PC via a network. The PC, to which a memory card is connected, outputs the received encrypted content to the memory card. The memory card decrypts the encrypted content using the distribution key, converts the data format of the decrypted content, encrypts the content using a medium unique key that is unique to the memory card, and records the resulting re-encrypted content internally. A playback apparatus decrypts the re-encrypted content using the medium unique key, and plays back the decrypted content.
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