| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily distribute streaming depending on various states such as requests of individual viewers and conditions particular to contents data. <P>SOLUTION: A terminal 1 uses a DNK (Device Node Key) included in a license with a limit of use supplied from a license server 12, generates a route key Kroot on the basis of an EKB (Enabling Key Block) included in a packet distributed from a distribution server 11, uses the root key Kroot to decode keys corresponding to the route key Kroot among the keys EKroot(Kc1), EKroot(Kc2), and EKroot(Kc3), acquires a contents key Kc1, Kc2 or Kc3, uses the contents keys to decode data corresponding to the contents key among EKc1(data 1), EKc2(data 2), and EKc3(data 3), acquires data 1, 2 or 3 being divided contents data and reproduces the data under a given reproduction condition. <P>COPYRIGHT: (C)2003,JPO |
