PDFProtect 2.3   
by Sybrex Systems LTD.   

PDFProtect 2.1 is a specialized software application that can change, add or remove security level standards in the PDF documents. This is a stand-alone application, which means that Adobe Acrobat (or any other product) is not required. To change current document encryption settings, simply select the PDF file or folder with PDF files, set new protection options and push the "Start" button. That?s all. The encryption level and security settings are changed automatically.