Recording medium, and device and method for recording information on recording medium
A technology for recording media and recording devices, applied in the direction of digital recording/reproduction, preventing unauthorized use of memory, etc., can solve the problems of processing time consumption, free capacity consumption, etc.
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Embodiment approach 1
[0097] 1.1 Structure of Recording Media
[0098] FIG. 1 is a diagram showing the structure of a semiconductor recording medium of the present invention. The semiconductor recording medium 100 includes a host interface unit 110 , a control unit 120 , and a data storage unit 130 .
[0099] The host interface unit 110 controls reception and transfer of information with a host device (player device, recording device, etc.) that reads and writes data to and from the semiconductor recording medium 100 .
[0100] The control unit 120 internally controls the semiconductor recording medium 100 . The control unit 120 interprets a read command or a write command received from the host device to access the data storage unit 130 . And, the result is notified to the host device via the host interface unit 110 as necessary.
[0101] The data storage unit 130 stores digital data, and is physically constituted by a nonvolatile memory such as a flash memory. The recording area of the da...
Embodiment approach 2
[0220] Hereinafter, Embodiment 2 of the present invention will be described in detail based on the drawings.
[0221] FIG. 14 is a diagram showing an example of the configuration of the semiconductor recording medium 100 according to the second embodiment of the present invention.
[0222] The difference from Embodiment 1 is that management information 1304 is included in the semiconductor recording medium 100 . As shown in FIG. 15 , management information 1304 stores information related to IDs corresponding to each content in the encrypted content in the first format and IDs corresponding to each content in the encrypted content in the second format. In the semiconductor recording medium 100, as described in the first embodiment, the encrypted content of the first format and the encrypted content of the second format exist for the same content. Therefore, in FIG. 15 , "ID #1 of encrypted content of the first format" and "ID #1 of encrypted content of the second format" for c...
Embodiment approach 3
[0323] In this embodiment, several examples are given. In the recording device of the above-mentioned embodiment, the encrypted content key (encrypted content-key) is changed from the first format (the format for sending content) to the second format (the format for local content). The specific structure and operation of the content key format conversion unit 230 related to the conversion processing of ) will be described.
[0324] In order to convert the encrypted content key, it is necessary to temporarily read the encrypted content key and write it again after changing the form, so there is a high risk of a security breach. Especially in the case of software installation, etc., technologies such as anti-tampering are required for the parts that require security. Since anti-tampering will lead to a decrease in processing speed and an increase in software size, it is necessary to reduce the number of modules necessary for security as much as possible. Hereinafter, a method fo...
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