Apparatus and method for controlling access to contents stored in card like electronic equipment
First Claim
Patent Images
1. A card like electronic device that is detachably connectable to a data processing device, comprising:
- a timer circuit for counting time data;
a control unit for accessing the timer circuit to read the time data; and
a nonvolatile memory, including a covered area that can be accessed by the control unit, for storing the time data read by the control unit and control data generated by the control unit based on the time data, anda read-only memory accessible only by the control unit and configured to store a program of a certification process used by the control unit,wherein the data processing device is permitted to access the covered area of the nonvolatile memory only after a successful completion of the certification process between the control unit and the processing device.
1 Assignment
0 Petitions
Accused Products
Abstract
Card like electronic equipment, such as a security digital (SD) memory card, includes a CPU, a real time clock (RTC) for counting time data; a FLASH ROM for storing the time data read out from the RTC into a covered RAM area of the ROM; and a lithium ion battery for supplying driving power to the RTC even when the SD memory card is not connected to a host personal computer, in order to enhance security of the contents data, e.g. copyright, protected by the CPU in the SD memory card.
-
Citations
7 Claims
-
1. A card like electronic device that is detachably connectable to a data processing device, comprising:
-
a timer circuit for counting time data; a control unit for accessing the timer circuit to read the time data; and a nonvolatile memory, including a covered area that can be accessed by the control unit, for storing the time data read by the control unit and control data generated by the control unit based on the time data, and a read-only memory accessible only by the control unit and configured to store a program of a certification process used by the control unit, wherein the data processing device is permitted to access the covered area of the nonvolatile memory only after a successful completion of the certification process between the control unit and the processing device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification