Recording medium, recording method and apparatus, reproduction method and apparatus, data transmission method, and data demodulation method

摘要

A recording medium including an area in which data that has been encoded with a first error correction code is recorded. 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. The data that can be decoded with the second error correction code composes at least part of encryption key data.