Recording medium, recording method and apparatus, reproducing method and apparatus, data transmitting method, and data decrypting method

Abstract

A recording medium having an area in which data that has been encoded with a first error correction code is recorded, wherein data that can be decoded with a second error correction code that is different from the first error correction code is recorded to the area along with the data that has been encoded with the first error correction code, and wherein the data that can be decoded with the second error correction code composes at least part of encryption key data.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application is a divisional of U.S. application Ser. No. 10 / 472,492, filed Sep. 30, 2003, which is a national stage of PCT / JP03 / 00526, filed Jan. 22, 2003, and in turn claims priority to JP 2002-024496 filed on Jan. 31, 2002, the entire contents of each are hereby incorporated herein by reference.TECHNICAL FIELD [0002] The present invention relates to a recording medium on which content data is recorded, a recording method, a recording apparatus, a reproducing method, a reproducing apparatus, a data transmitting method, and a data decrypting method. BACKGROUND ART [0003] Since optical discs such as a CD (Compact Disc) and a CD-ROM (Compact Disc Read Only Memory) are easy to handle and are produced at relatively low cost, they have been widely used as recording mediums for storing data. In recent years, a CD-R (Compact Disc Recordable) disc, on which data can be recorded once, and a CD-RW (Compact disc ReWritable) disc, on wh...

AI Technical Summary

Benefits of technology

[0008] According to the present invention, an encryption key can be recorded without influence of a conventional CD drive and a conventional CD-ROM. To improve the secrecy of the encryption key, the position of the area on the disc, the position of data in the area, and so forth are kept secret. Preferably, the structure of data in the area is changed for each disc and for each stamper. In addition, when the encryption key is read from the area, by various measures, the secrecy of the encryption key is improved.

Problems solved by technology

As a result, a problem about copyright protection has arisen.

However, when encryption key data and a disc are separately distributed, a particular system is required and becomes troublesome.

However, it was difficult to record encryption key data on a disc in such a manner that the encryption key data cannot be easily known.

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