Method for transmission/reception of contents usage right information in encrypted form, and device thereof
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United States of America Patent
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Jan 29, 2013
Grant Date -
Jan 26, 2006
app pub date -
Jul 21, 2005
filing date -
Jul 21, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Confidential data such as license data is encrypted using the symmetric key encryption algorithm alone which requires smaller computation amount, and is readily realized by hardware elements, as compared with the public key encryption algorithm. A license-data transmitter (y) encrypts license data LIC using two keys Kscy and Kssx supplied from a license-data receiver (x). The license data is provided to the license-data receiver in the form of encrypted license data E(Kscy, E(Kssx, LIC)). This enables high-speed processing without deterioration in security even if data access such as recording/readout of data is repeated.
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