SysInfoTools PDF Protect and Unprotect - Version 2.0 PDF Protect And Unprotect from SysInfotools is a lightweight, powerful, advance, cost effective PDF restriction imposer and remover tool that allow user to impose various security parameters on pdf file as well as at the same time it also allows user to remove various security parameters PDF Protect And Unprotect Tool from SysInfoTools is a stand-alone application which means that Adobe Acrobat (or any other product) is not required for proper functioning of this piece of software.If the PDF file contains the user password then the PDF file will be encrypted and the user password is required before imposing or removing the security parameters. PDF Protect And Unprotect from SysInfoTools can supports PDF documents with up-to 40 or 128 bit encryption for input and output PDF files.PDF Protect & Unprotect from SysInfotools is safe and non destructive tool i.e. it do not perform any write operation on PDF file, it modifies only the security parameters of file keep the originality of the file