Contents utilization system, contents utilization device and contents utilization information storage device
OwnerYoshihiro Hori, Takatoshi Yoshikawainventors
Life of this patent
Estimating the term…
Abstract
A contents utilization device according to the present invention determines whether or not digital contents are utilized, and restores license data to a state before update thereof if it is determined the digital contents are not utilized. Specifically, the license data includes usage rules for the digital contents and the like and is updated according to output of the digital contents.
Claims8
A contents utilization system comprising:
- a contents utilization device which utilizes encrypted digital contents with a contents utilization information including a contents key for decrypting the encrypted digital contents and a usage rule for the encrypted digital contents;
- and
- a contents utilization information storage device which stores the contents utilization information and updates the usage rule of the stored contents utilization information according to output of the stored contents utilization information to the contents utilization device, wherein
- the contents utilization device includes:
- a log storage unit which stores a contents utilization information identifier for identifying the contents utilization information and the usage rule;
- a utilization determination unit which determines whether or not the digital contents are utilized;
- and
- a restoration request unit which requests restoration of the stored contents utilization information to a state before update thereof if the utilization determination unit determines that the digital contents are not utilized and transmits the contents utilization information identifier and the usage rule, both of which are stored in the log storage unit, to the contents utilization information storage device, and
- the contents utilization information storage device includes:
- a rewrite determination unit which determines whether or not to rewrite the stored contents utilization information based on whether or not the contents utilization information identifier transmitted from the restoration request unit coincides with the contents utilization information identifier included in the stored contents utilization information;
- and
- a rewrite unit which rewrites the usage rule included in the stored contents utilization information into the usage rule transmitted by the restoration request unit based on a result of determination by the rewrite determination unit.
A contents utilization device which utilizes digital contents by receiving a contents utilization information including a usage rule for the digital contents from a contents utilization information storage device which stores the contents utilization information and updates the usage rule of the stored contents utilization information according to output of the stored contents utilization information, the contents utilization device comprising:
- a log storage unit which stores a contents utilization information identifier for identifying the contents utilization information and the usage rule;
- a utilization determination unit which determines whether or not the digital contents are utilized;
- and
- a restoration request unit which requests restoration of the stored contents utilization information to a state before update thereof if the utilization determination unit determines that the digital contents are not utilized, and transmits the contents utilization information identifier and the usage rule, both of which are stored in the log storage unit, to the contents utilization information storage device.
A contents utilization information storage device which stores a contents utilization information including a usage rule for digital contents and updates the usage rule of the stored contents utilization information according to output of the stored contents utilization information to a contents utilization device which utilizes the digital contents, the contents utilization information storage device comprising:
- a rewrite determination unit which receives a contents utilization information identifier for identifying the contents utilization information transmitted from the contents utilization device, and determines whether or not to rewrite the stored contents utilization information based on whether or not the received contents utilization information identifier coincides with the contents utilization information identifier included in the stored contents utilization information;
- and
- a rewrite unit which rewrites the usage rule included in the stored contents utilization information into the usage rule transmitted from the contents utilization device, based on a result of determination by the rewrite determination unit.
Dependencies are inferred from the claim text.