Method and apparatus for embedding information in content, method and apparatus for reconstructing content, and method and apparatus for extracting information

摘要

Disclosed are an information embedding method and apparatus for embedding watermark data in programs and compressed data. The method includes generating encoded content by attaching an error correction code to content, and generating watermark-embedded encoded content by embedding watermark data in the encoded content that has been generated. The watermark data has such data length that the watermark data can be removed if decoding processing is executed using the error correction code. The original content can be obtained from the watermark-embedded encoded content by decoding processing based upon the error correction code that has been attached to the watermark-embedded encoded content.