Recording device and recording and reproducing device

• US 20050210187A1
• Filed: 05/13/2004
• Published: 09/22/2005
• Est. Priority Date: 03/17/2004
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamamoto, Takayuki
• Granted Patent: US 7,185,160 B2
• Time in Patent Office: Days
• US Class Current: 711/112
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 2221/2137 Time limited access, e.g. to a computer or data
• CPC Class Codes: G06F 3/0622 in relation to access
• CPC Class Codes: G06F 3/0637 Permissions
• CPC Class Codes: G06F 3/0674 Disk device
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date

Abstract

To make content irreproducible in a recording device after a set expiration time, the recording device has a read/write unit for reading and writing data on a recording unit, the read/write unit having electric power supplied from an external power source, a clock containing a built-in battery, an input/output interface for inputting data from outside and outputting data to outside, and a controller for controlling the read/write unit and the input/output interface. The recording medium includes an ordinary data area for writing ordinary data and an expiration time data area for writing an expiration time of ordinary data. The controller prevents ordinary data written in the ordinary data area from being output to outside when the expiration time written in the expiration time area has passed a time limit calculated by the clock.

Claims

1. A recording device for recording data on a recording medium, comprising:

read/write means for reading or writing data on a recording medium, said read/write means having electric power being supplied by an external power source;

a battery-built-in clock containing a built-in battery and a clock function;

an input/output interface for inputting data from outside and outputting data to outside; and

a controller for controlling said read/write means and said input/output interface, wherein said recording medium includes an ordinary data area for writing ordinary data and an expiration time data area for writing an expiration time of said ordinary data, and wherein said controller performs control to prevent ordinary data written in said ordinary data area from being output to outside when said expiration time written in said expiration time data area has passed a time limit calculated by the clock function of said battery-built-in clock.

2. A recording device according to claim 1, wherein said recording device is a hard disk drive, wherein said recording medium is a disk, wherein said read/write means writes or reads data in sector units on said disk, and wherein in said disk, each said sector comprises an ordinary data area to write ordinary data and an expiration time data area to write an expiration time of said ordinary data.

3. A recording device according to claim 1, wherein said preventing ordinary data written in said ordinary data area from being output to outside includes that ordinary data is altered and output, so that said ordinary data is prevented from being output.

4. A recording device according to claim 1, wherein said preventing ordinary data written in said ordinary data area from being output to outside includes that ordinary data recorded on the recording medium is not read by said read/write means, so that said ordinary data is prevented from being output to outside.

5. A recording device according to claim 1, wherein data is output in sector units from said input/output interface and sector positions are specified through said input/output interface by an external recording/reproducing device.

6. A recording device according to claim 1, wherein sectors and data to be read or written are specified by a file system of an external recording/reproducing device.

7. A recording device according to claim 1, wherein it is possible to set an expiration time mode, and when the expiration time mode has been set, an expiration time is written, or when an expiration time has not been set, no expiration time is written.

8. A recording device according to claim 1, further comprising means for authenticating external recording/reproducing devices.

9. A recording device according to claim 8, further comprising:

means for holding a public key in public key encryption system to authenticate an external recording/reproducing device;

means for encrypting data by using a public key and outputting data from said input/output interface; and

means for comparing data before encryption with data received from the input/output interface.

10. A recording device according to claim 8, further comprising:

means for generating a random number to authenticate the external recording/reproducing device.

11. A recording/reproducing device for controlling said controller set forth in claim 1, comprising means for controlling such that data with an expiration time is written in said recording device through said input/output interface, means for controlling such that after said expiration time has expired, said written data is read from said recording device, and means for deciding, when said read data coincides with said written data, that said expiration time is not valid.

12. A recording device for recording data on a recording medium, comprising:

read/write unit which reads or writes data on a recording medium, said read/write means having electric power being supplied by an external power source;

a battery-built-in clock containing a built-in battery and a clock function;

an input/output interface for inputting data from outside and outputting data to outside; and

a controller for controlling said read/write unit and said input/output interface, wherein said recording medium includes an ordinary data area for writing ordinary data and an expiration time data area for writing an expiration time of said ordinary data, and wherein said controller performs control to prevent ordinary data written in said ordinary data area from being output to outside when said expiration time written in said expiration time data area has passed a time limit calculated by the clock function of said battery-built-in clock.

13. A recording device according to claim 12, wherein said recording device is a hard disk drive, wherein said recording medium is a disk, wherein said read/write unit writes or reads data in sector units on said disk, and wherein in said disk, each said sector comprises an ordinary data area to write ordinary data and an expiration time data area to write an expiration time of said ordinary data.

14. A recording device according to claim 12, wherein said preventing ordinary data written in said ordinary data area from being output to outside includes that ordinary data is altered and output, so that said ordinary data is prevented from being output.

15. A recording device according to claim 12, wherein said preventing ordinary data written in said ordinary data area from being output to outside includes that ordinary data recorded on the recording medium is not read by said read/write unit, so that said ordinary data is prevented from being output to outside.

16. A recording device according to claim 12, wherein data is output in sector units from said input/output interface and sector positions are specified through said input/output interface by an external recording/reproducing device.

17. A recording device according to claim 12, wherein sectors and data to be read or written are specified by a file system of an external recording/reproducing device.

18. A recording device according to claim 12, wherein it is possible to set an expiration time mode, and when the expiration time mode has been set, an expiration time is written, or when an expiration time has not been set, no expiration time is written.

19. A recording device according to claim 12, further a comprising unit which authenticates external recording/reproducing devices.

20. A recording device according to claim 19, further comprising:

a unit which holds a public key in public key encryption system to authenticate an external recording/reproducing device;

a unit which encrypts data by using a public key and outputting data from said input/output interface; and

a unit which compares data before encryption with data received from the input/output interface.

21. A recording device according to claim 19, further comprising:

a unit which generates a random number to authenticate the external recording/reproducing device.

22. A recording/reproducing device for controlling said controller set forth in claim 12, comprising a unit which controls such that data with an expiration time is written in said recording device through said input/output interface, a unit which controls such that after said expiration time has expired, said written data is read from said recording device, and a unit which decides, when said read data coincides with said written data, that said expiration time is not valid.