Patent ID: 9003188
Filing Date: 2015-04-07
Classification: G06F,G11B,H04L,H04N

Abstract:
1. A recording medium device for storing contents used by terminal devices connected to the recording medium device, comprising: a content storage unit configured to store contents including a special content; an attribute storage unit configured to store attributes of the contents, which correspond one-to-one to the contents and among which an attribute of the special content contains content identifying information distinguishing the special content from regular contents; a revocation information storage unit configured to store revocation information including a first region indicating a terminal device restricted from using any content and a second region indicating a terminal device restricted from using the special content; a device identifying information acquisition unit configured to acquire device identifying information from a terminal device connected to the recording medium device, the device identifying information identifying the terminal device; a usage information output unit configured to output usage information to a terminal device connected to the recording medium device, the usage information being necessary for using the special content; a content identifying information acquisition unit configured to acquire the content identifying information from a terminal device connected to the recording medium device; and a control unit configured to (i) when a terminal device attempts to use the special content, perform a first determination as to whether or not the terminal device is restricted from using any content, by comparing the first region of the revocation information with the device identifying information acquired from the terminal device, and when the result of the first determination is affirmative, prohibit the content identifying information acquisition unit from acquiring the content identifying information from the terminal device, and (ii) when the content identifying information acquisition unit acquires the content identifying information from the terminal device, perform a second determination as to whether or not the terminal device is restricted from using the special content, by comparing the second region of the revocation information with the device identifying information of the terminal device, and when the result of the second determination is affirmative, prohibit the usage information output unit from outputting the usage information to the terminal device.