SysInfoTools Software has recently updated its PDF Restriction Remover tool 21.08 with some major additions. A number of improvements and changes have been made in this updated version to make it more interactive and robust. Now users are allowed to select multiple PDF files at a time to perform batch operation in order to save their precious time. The updated version will display complete Meta data information of selected PDF file, and also allow users to perform changes on them as per requirement. The tool supports PDF files which are created in Adobe Acrobat 3.0 or any later version. Users can download free demo version of this tool before purchasing the licensed version.
Source: http://www.sysinfotools.com/recovery/pdf-unprotected.php