| 摘要 |
An image distributing system comprises clients (2) connectable through a network environment such as the Internet (1), an image file server (3) havin g an image file database (5) where image files are stored and a log file (6), a user database (7), and a security control server (4) having an image key database (8) and a log file (9). A client who has requested an image makes a n access to the security control server by means of an IP address that the client obtains from the image file server is authenticated, obtains an image key, can open image data from the image file server, encodes the security da ta including the date and time of the delivery of the image data, the user ID, the serial number of the hard disk, and the IP address of the client, buries the security data as electronic watermark in the image data developed on the own memory, sends the data to the security control server, and allows the server to store it in the log file.
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