PDFProtectFree是一个非常有用和安全的实用程序,保护您的PDF文件。您可以添加用户密码,以防止除您之外的任何人打开和查看您的文档。所以,您的隐私将受到保护。同时,您也可以添加所有者密码以限制PDF文件的权限。有八个选项可以选择限制权限,如提取打印,高清打印,修改,复制,注释,屏幕阅读器,表单填充。在受保护的PDF文件上设置所有者密码后,用户无法使用这些受限制的权限。
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