Writing apparatus, semiconductor memory card, writing proguram, and writing method

• US 20040242029A1
• Filed: 06/29/2004
• Published: 12/02/2004
• Est. Priority Date: 07/18/2001
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Hasegawa, Kiichi, Fujimura, Kazuya, Nakamura, Norio, Harada, Shunji, Murase, Kaoru, Matsui, Shinichi, Noguchi, Naohiko
• Application Number:
  US10/483,814
• Publication Number:
  US 20040242029A1
• Time in Patent Office: Days
• US Class Current: 439/66
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0664 at device level, e.g. emulation of a storage device or system
• CPC Class Codes: G06K 19/077 Constructional details, e.g. mounting of circuits in the carrier
• CPC Class Codes: G06K 19/07732 the record carrier having a housing or construction similar to well-known portable memory devices, such as SD cards, USB or memory sticks housings for electrical equipment in general, see H05K5/02
• 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 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00746 wherein the usage restriction can be expressed as a specific number
• CPC Class Codes: G11C 16/22 Safety or protection circuits preventing unauthorised or accidental access to memory cells
• CPC Class Codes: G11C 7/24 Memory cell safety or protection circuits, e.g. arrangements for preventing inadvertent reading or writing; Status cells; Test cells

Abstract

The card writer (101) detects whether the sliding member (1) constituting the slide switch of the SD memory card is in the first position or the second position. The device driver (60) of the host computer (100) sets the memory area within the SD memory card to the writable state when the sliding member is in the first position. On the other hand, when the sliding member is in the second position, the device driver sets the memory area to the non-writable state except a part of the memory area. This part is the protected area (25) that is writable even when the protected area (25) is set to the non-writable state.

Claims

1. A writing apparatus that writes data into a user area within a semiconductor memory card according to an instruction issued by an application program, the writing apparatus comprising:

a recognition unit operable to recognize the user area to be in a writable state or in a non-writable state depending on a position of a sliding member, the sliding member being exposed on a surface of the semiconductor memory card and being manually slidable;

a write unit operable to write data into the user area in the writable state, and when the user area is in the non-writable state, to perform an exceptional write operation, wherein

the exceptional write operation is performed according to a special write command issued by the application program to write data into a memory area within the semiconductor memory card that is different from the user area.

2. The writing apparatus of claim 1, wherein

the semiconductor memory card has an authentication circuit,

the special write command includes (i) an instruction for directing the writing apparatus to authenticate the semiconductor memory card, and (ii) an instruction for directing the authentication circuit of the semiconductor memory card to authenticate the writing apparatus, and

the exceptional write operation is performed only when the writing apparatus and the semiconductor memory card are authenticated mutually and successfully.

3. The writing apparatus of claim 2, wherein

the user area has a content recorded therein,

the different memory area is a protected area having usage condition information recorded therein, the usage condition information corresponding to the content, and

the special write command is issued when a new value is to be written in the protected area to update the usage condition information.

4. The writing apparatus of claim 3, wherein

usage of the content is to play back or copy the content,

the usage condition information includes a permitted number of playback times or a permitted number of copying times for the content, and

the new value written to update the usage condition information is the permitted number of playback times or the permitted number of copying times that has been incremented or decremented in response to playback or copying of the content performed.

5. The writing apparatus of claim 1, further comprising a judgment unit operable to judge whether the semiconductor memory card is of a first type or a second type, wherein

the write unit does not perform the exceptional write operation when the semiconductor memory card is of the second type and the user area is in the non-writable state, and performs the exceptional write operation when the semiconductor memory card is of the first type and the user area is in the non-writable state.

6. The writing apparatus of claim 5, wherein

the semiconductor memory card of the first type has an authentication circuit,

the semiconductor memory card of the second type has no authentication circuit,

the special write command instructs (i) the writing apparatus to authenticate the semiconductor memory card, and (ii) the authentication circuit of the semiconductor memory card to authenticate the writing apparatus, and

the exceptional write operation is performed only when the writing apparatus and the semiconductor memory card are mutually authenticated.

7. A semiconductor memory card, comprising:

a sliding member being exposed on a surface of the semiconductor memory card and being manually slidable;

a non volatile memory having a user area and a protected area; and

a recognition unit operable to recognize the user area to be in a writable state or in a non-writable state depending on a position of the sliding member, wherein

the protected area is exceptionally writable according to a special write command issued by an application program even when the user area is in the non-writable state.

8. The semiconductor memory card of claim 7, further comprising an authentication circuit, wherein

the special write command includes (i) an instruction for directing the writing apparatus to authenticate the semiconductor memory card, and (ii) an instruction for directing the authentication circuit of the semiconductor memory card to authenticate the writing apparatus, and

the protected area is exceptionally writable only when the writing apparatus and the semiconductor memory card are authenticated mutually and successfully.

9. The semiconductor memory card of claim 8, wherein

the user area has a content recorded therein,

the protected area has usage condition information recorded therein, the usage condition information corresponding to the content, and

the special write command is issued when a new value is to be written in the protected area to update the usage condition information recorded.

10. The semiconductor memory card of claim 9, wherein

usage of the content is to play back or copy the content,

the usage condition information includes a permitted number of playback times or a permitted number of copying times for the content, and

the new value written to update the usage condition information is the permitted number of playback times or the permitted number of copying times that has been incremented or decremented in response to playback or copying of the content performed.

11. A computer readable program for having a computer perform a write operation to write data into a user area within a semiconductor memory card according to an instruction issued by an application program, comprising:

a recognition step of recognizing the user area to be in a writable state or in a non-writable state depending on a position of a sliding member, the sliding member being exposed on a surface of the semiconductor memory card and being manually slidable; and

a write step of writing data into the user area in the writable state, and when the user area is in the non-writable state, to perform an exceptional write operation, wherein

the exceptional write operation is performed according to a special write command issued by the application program to write data into a memory area within the semiconductor memory card that is different from the user area.

12. The computer readable program of claim 11, wherein

the semiconductor memory card has an authentication circuit,

the special write command includes (i) an instruction for directing the writing apparatus to authenticate the semiconductor memory card, and (ii) an instruction for directing the authentication circuit of the semiconductor memory card to authenticate the writing apparatus, and

the exceptional write operation is performed only when the writing apparatus and the semiconductor memory card are authenticated mutually and successfully.

13. The computer readable program of claim 12, wherein

the user area has a content recorded therein,

the different memory area is a protected area having usage condition information recorded therein, the usage condition information corresponding to the content, and

the special write command is issued when a new value is to be written in the protected area to update the usage condition information.

14. The computer readable program of claim 13, wherein

usage of the content is to play back or copy the content,

the usage condition information includes a permitted number of playback times or a permitted number of copying times for the content, and

the new value written to update the usage condition information is the permitted number of playback times or the permitted number of copying times that has been incremented or decremented in response to playback or copying of the content performed.

15. The computer readable program of claim 11, further comprising a judgment step of judging whether the semiconductor memory card is of a first type or a second type, wherein

the write step does not perform the exceptional write operation when the semiconductor memory card is of the second type and the user area is in the non-writable state, and performs the exceptional write operation when the semiconductor memory card is of the first type and the user area is in the non-writable state.

16. The computer readable program of claim 15, wherein

the semiconductor memory card of the first type has an authentication circuit,

the semiconductor memory card of the second type has no authentication circuit,

the special write command instructs (i) the writing apparatus to authenticate the semiconductor memory card, and (ii) the authentication circuit of the semiconductor memory card to authenticate the writing apparatus, and

the exceptional write operation is performed only when the writing apparatus and the semiconductor memory card are mutually authenticated.

17. A recording medium storing the program of claim 11.

18. A method for writing data into a user area within a semiconductor memory card according to an instruction issued by an application program, comprising:

a recognition step of recognizing the user area to be in a writable state or in a non-writable state depending on a position of a sliding member, the sliding member being exposed on a surface of the semiconductor memory card and being manually slidable; and

a write step of writing data into the user area in the writable state, and when the user area is in the non-writable state, to perform an exceptional write operation, wherein

the exceptional write operation is performed according to a special write command issued by the application program to write data into a memory area within the semiconductor memory card that is different from the user area.

19. The method of claim 18, wherein

the semiconductor memory card has an authentication circuit,

the special write command includes (i) an instruction for directing the writing apparatus to authenticate the semiconductor memory card, and (ii) an instruction for directing the authentication circuit of the semiconductor memory card to authenticate the writing apparatus, and

the exceptional write operation is performed only when the writing apparatus and the semiconductor memory card are authenticated mutually and successfully.

20. The method of claim 19, wherein

the user area has a content recorded therein,

the different memory area is a protected area having usage condition information recorded therein, the usage condition information corresponding to the content, and

the special write command is issued when a new value is to be written in the protected area to update the usage condition information.

21. The method of claim 20, wherein

usage of the content is to play back or copy the content,

the usage condition information includes a permitted number of playback times or a permitted number of copying times for the content, and

the new value written to update the usage condition information is the permitted number of playback times or the permitted number of copying times that has been incremented or decremented in response to playback or copying of the content performed.

22. The method of claim 18, further comprising a judgment step of judging whether the semiconductor memory card is of a first type or a second type, wherein

the write step does not perform the exceptional write operation when the semiconductor memory card is of the second type and the user area is in the non-writable state, and performs the exceptional write operation when the semiconductor memory card is of the first type and the user area is in the non-writable state.

23. The method of claim 22, wherein

the semiconductor memory card of the first type has an authentication circuit,

the semiconductor memory card of the second type has no authentication circuit,

the special write command instructs (i) the writing apparatus to authenticate the semiconductor memory card, and (ii) the authentication circuit of the semiconductor memory card to authenticate the writing apparatus, and

the exceptional write operation is performed only when the writing apparatus and the semiconductor memory card are mutually authenticated.