Copyright protection assistance system

A copyright protection assistance system, wherein

• a content delivery device
• stores embedded region specification information having identification information of comic contents, a page of the comic contents, and definition information of an embedded region in the page, and user information of a logged-in user receiving delivery of the comic contents,
• in response to a request for delivery of specific comic contents by a specific user, embeds the user information of the specific user by means of a difficult-to-perceive digital watermark in the embedded region specified by the embedded region specification information corresponding to the identification information of the specific comic contents, and delivers the specific comic contents with the user information of the specific user embedded by means of the digital watermark, to a user terminal of the specific user, and
• transmits the identification information of the delivered specific comic contents and the user information of the specific user in association with each other to a copyright management device for storage purpose.

A copyright protection assistance system, wherein

• a content delivery device is configured to store embedded region specification information having identification information of comic contents, a page of the comic contents, and definition information of an embedded region in the page, and user information of a logged-in user receiving delivery of the comic contents, embed, in response to a request for delivery of specific comic contents by a specific user, the user information of the specific user by means of a difficult-to-perceive digital watermark in the embedded region specified by the embedded region specification information corresponding to the identification information of the specific comic contents, and deliver the specific comic contents with the user information of the specific user embedded by means of the digital watermark, to a user terminal of the specific user,
• a copyright management device
• transmits, to the content delivery device, embedded region specification information uniformly set for specific comic contents, having identification information of comic contents, a page of the comic contents, and definition information of an embedded region in the page,
• receives, from the content delivery device, and stores the identification information of the delivered specific comic contents and the corresponding user information of the specific user receiving delivery,
• downloads, from a fraudulent server, fraudulent comic contents with contents at least partially identical to the specific comic contents having been illegally uploaded and disclosed,
• detects the user information embedded by means of the digital watermark of the fraudulent comic contents in a region corresponding to the embedded region of the embedded region specification information of the specific comic contents, and
• specifies the detected user information embedded by means of the digital watermark by collating the detected user information with the stored user information corresponding to the identification information of the specific comic contents.