Checkmark 是数字水印中应用的攻击测试软件，是每个在做数字水印的人的必须使用的工具，这个文章告诉你怎么使用checkmark-Checkmark is the application of digital watermarking attacks testing software, are each at digital watermarking to do the people have to use a tool, this

网页开发处理设置，验证码设置，checkma 可以修改，验证-Web development process set up, authentication code set, checkma can modify, verify