Patent ID: 6947572

Claim:
An image transmission system, comprising: a client comprising: an image request section that requests transmission of image data; an output instruction section that instructs output of an image data file of a general purpose format; and an output section that outputs the image data file of the general purpose format designated as an output file; a server comprising: high-resolution data as the image data file to be transmitted; a watermark insertion section that forms low-resolution data as the general purpose format file of the image data, and which provides an electronic watermark to the low-resolution data, the electronic watermark specifying the high-resolution data as watermark information whose resolution is reduced relative to said high-resolution data; and a distribution section that transmits the high-resolution data, the low-resolution data, and a data selection program that allows the client to execute a watermark detection processing, wherein said data selection program allows the client to detect existence of the electronic watermark of the low-resolution data whose output is instructed, to specify the high-resolution data from the watermark information and to designate the high-resolution data as the output file when the watermark information is detected, and the low-resolution data is designated as the output data when the watermark information is not detected; and a network that connects the client and the server.