Abstract: The phenomenon of pirate and copyright infringement has been a common issue because of easy replication and modification of electronic images, leading to the decreasing number of original and high-quality images and affecting their shared use on agricultural network. To fight against the infringement behaviours such as image copying, modifying,downloading or screenshot,some effective and useful methods were analysed and compared in this study,including eye-catching image watermarking,digital image watermarking,image metadata storing,forbidden image replication ,forbidden image searching and image browse in an appropriate client browser. By comparing the advantages and disadvantages of different methods ,one reasonable strategy was putting forward to promote legal spreading and utilization of electronic images in agricultural network.

Key words: image copyright, digital watermark, image browser, screenshot