INFORMATION TRANSMISSION SYSTEM, TRANSMITTER, AND

专利名称：INFORMATION TRANSMISSION SYSTEM,

TRANSMITTER, AND TRANSMISSIONMETHOD AS WELL AS INFORMATIONRECEPTION SYSTEM, RECEIVER ANDRECEPTION METHOD

发明人：ISHIBASHI, YOSHIHITO,,OHISHI,

TATEO,,MATSUYAMA, SHINAKO,,ASANO,TOMOYUKI,,MUTO, AKIHIRO,,KITAHARA,JUN

申请号：EP00955022申请日：20000825公开号：EP1134670A4公开日：20060426

摘要：Content data encrypted with a content key, the content key encrypted with anindividual key specific to an information sending device, and the individual key encryptedwith a distribution key that is updated in a predetermined cycle, and supplied are sent toan information receiving device, and the information receiving device decrypts theindividual key with the distribution key, decrypts the content key with the individual key,and decrypts the content data with the content key. Thus, the information sending devicedoes not have the distribution key, and accordingly piracy of content data can beprevented with a simple configuration. Also, the information receiving device sends thecontent key and a playback command to other apparatuses. Thus, other apparatuses canplay back contents using the playback command and the content key. Furthermore, the

information sending device decrypts the content key with the distribution key beforebeing updated, and stores the same. Thus, contents purchased by an advance order canbe actually purchased regardless of expiration dates of the distribution key.

Furthermore, usage right is passed from a first information receiving device to a secondinformation receiving device different in registration information at the tome of usingcontents. Thus, contents can be used among information receiving devices different fromeach other in registration information.

申请人：SONY CORPORATION

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