Semiconductor memory card
First Claim
1. A semiconductor memory card attachable and removable to and from electronic equipment, comprising:
- a first rewritable nonvolatile memory;
first access control unit for controlling access by the electronic equipment to the first nonvolatile memory;
communication unit for controlling access by the electronic equipment to a storage device on a network which has a second rewritable nonvolatile memory;
second access control unit for controlling access by the electronic equipment to the second nonvolatile memory; and
space unification unit for forming a virtual unified memory space including the first nonvolatile memory and the second nonvolatile memory.
2 Assignments
0 Petitions
Accused Products
Abstract
A memory card 13 includes wireless network communication unit for having electronic equipment to access a storage server 11 on a network. The storage server 11 includes at least a non-authentication area 111. Data such as contents is written into a non-authentication area of the memory card 13 or the non-authentication area 111 of the storage server 11. In other words, an area of a storage area to which data can be written is expanded by the non-authentication area 111 of the storage server 11. Thus, the non-authentication area of the memory card 13 increases apparently. Encoding key used for encoding and decoding contents protected by copyrights is written to an authentication area on the memory card 13. Anyone can access content data in the non-authentication area 111 of the storage server 11, but an encoding key required for decoding the content is in the memory card 13. Thus, only a person who has the memory card 13 and valid electronic equipment can decode, reproduce and output the content using the encoding key. In this way, the storage capacity of the memory card 13 can be increased apparently while security of data protected by copyrights is guaranteed.
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Citations
12 Claims
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1. A semiconductor memory card attachable and removable to and from electronic equipment, comprising:
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a first rewritable nonvolatile memory;
first access control unit for controlling access by the electronic equipment to the first nonvolatile memory;
communication unit for controlling access by the electronic equipment to a storage device on a network which has a second rewritable nonvolatile memory;
second access control unit for controlling access by the electronic equipment to the second nonvolatile memory; and
space unification unit for forming a virtual unified memory space including the first nonvolatile memory and the second nonvolatile memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A memory space management method, comprising:
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a first access control step for controlling access by electronic equipment to a first rewritable nonvolatile memory;
a communication step for controlling access by the electronic equipment to a storage device on a network which has a second rewritable nonvolatile memory;
a second access control step for controlling access by electronic equipment to the second nonvolatile memory; and
a space unification step for forming a virtual unified memory space including the first nonvolatile memory and the second nonvolatile memory.
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12. A memory space management program which is recorded on a semiconductor memory card which is attachable and removable to and from electronic equipment and includes a computer, causing the computer to function as:
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first access control unit for controlling access by electronic equipment to a first rewritable nonvolatile memory;
communication unit for controlling access by the electronic equipment to a storage device on a network which has a second rewritable nonvolatile memory;
second access control unit for controlling access by electronic equipment to the second nonvolatile memory; and
space unification unit for forming a virtual unified memory space including the first nonvolatile memory and the second nonvolatile memory.
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Specification