PDF Password Remover will decrypt PDF files protected with owner password, it will remove restrictions of PDF files, restrictions usually include the impossibility to print or edit or modify the PDF file. PDF Password Remover can't decrypt PDF files protected with user passwords which you are asked for opening the file.
PDF Password Remover can decrypt PDF files encrypted with standard encryption handler only. The documents protected with any other encryption handlers (like FileOpen, SASS_INTERNET_STDS from Standards Australia Software Services, or SoftLock's Acrobat Security Plug-Ins) cannot be decrypted.