PDF解除密码的工具，只需导入PDF文件并选择导出位置，就可以解密文件了。,PDF lifting passwords tools, simply import the PDF file and select the export location, you can decrypt the file.

Owl是一个多用户文档管理系统。它可对文件夹和文件设置权限，基于角色权限管理，具有易于使用并且简洁的用户操作与管理界面，能够对文件夹和文件进行监控，支持对文本，MS-Word和PDF文件进行全文搜索，提供下载统计功能，数据库备份工具，新闻系统，版本控制，回收站，自定文档类型等等。-Owl is a multi-user document management system. It can be set on the folder and file permissions, role-based

This a suite of tools to solve automatic numerical differentiation problems in one or more variables. All of these methods also produce error estimates on the result. A pdf file is also provided to explain the theory behind these tools.Author: John