| 摘要 |
<p>PROBLEM TO BE SOLVED: To safely provide and manage a decryption key for decrypting encrypted content, in a file including the content.SOLUTION: A content transmission/reception system 100 comprises a content server 300 that embeds, as a digital watermark, a decryption key for decrypting encrypted first content in second content, creates one file including the encrypted first content and the second content in which the digital watermark is embedded, and transmits the file. The content transmission/reception system 100 comprises a user terminal 400 that receives the file from the content server 300 through a network 500, acquires the decryption key by detecting the digital watermark embedded in the second content included in the file, decrypts the first content included in the file by using the decryption key, and reproduces the decrypted first content.</p> |
