Drive device, content reproduction device, recording device, data readout method, program, recording medium, and integrated circuit

Abstract

Provided is a drive device capable of preventing the reproduction of contents from a copied content to promote the copyright protection even if identification information unique to a recording medium used to generate a title key for decoding an encrypted content is exposed and the contents are privately encrypted and copied by using the identification information. The identification information unique to the medium used to generate the title key and a signature for identification information issued by an authentication station terminal device (101) are recorded on a recording medium (103). A drive in a reproduction device (104) performs verification of the signature prior to the decoding and reproduction of the encrypted contents. The drive outputs no identification information in the case of a failure in the verification. Thus, a reproducing program in the reproduction device (104) is unable to generate a decoding key, resulting in a failure in the decoding and reproduction of the encrypted contents. Additionally, the signature is not outputted to the outside of the drive. As a result, an unauthorized person is prevented from making the unauthorized copy of the recording medium (103).

Description

technical field [0001] The present invention relates to the copyright protection of digital content, and particularly relates to the technique of suppressing the illegal copying of the recording medium on which the digital content is recorded. Background technique [0002] In recent years, works such as movies and music have been digitized and sufficiently distributed as digital content (hereinafter simply referred to as content). The importance of copyright protection technology is very high because the content can be copied easily and the quality will not be deteriorated by copying. In DVD (Digital Versatile Disc), which is one of the representative media used for content distribution, in order to protect copyright, identification information for identifying the recording medium is usually recorded in the recording area where data copying cannot be performed, and the identification information is used for Part of the key used for encryption (see Non-Patent Document 1) is ...

AI Technical Summary

Problems solved by technology

[0005] However, it is also conceivable that an illegal person obtains and utilizes a device capable of writing arbitrary identification information on a recording medium that does not record identification information, and writes identification information that is identical to the identification information of the recording medium of the copy source to the recording medium of the copy destination.

In the prior art described above, it is unavoidable that the recording medium is duplicated by the device capable of writing identification information.

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