Sybrex SpeedPDF Protection Manager is a stand-alone, fully automatic software application that can change, add, or remove security level standards in the PDF documents. 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.

Ссылка: http://www.sybr../gui/files/protectionmanager/SpeedPDFProtMgrInst.exe