Create PDF files from any Windows application running on Windows NT (SP3+), Windows 2000, Windows XP and Windows Server 2003. The software installs itself as a print driver, all you have to do is to click "Print" from your application to create PDF files. PDF4U Pro presents all the features of PDF4U, and it also has the feature for Automatic Output of PDF files. Another difference is support for password protection with 40- or 128-bit encryption to secure PDF documents as well as access control preventing your PDF document from being modified, copied, converted, commented, printed, signed, filled, accessed and assembled. In Addition to PDF4U, 14 more options are available in PDF4U Pro. PDF Batch conversion is supported in this version. Users may batch convert DOC to PDF, RTF to PDF, TXT to PDF, XLS to PDF, HTM to PDF, DWG to PDF, DXF to PDF with a mouse-click. More features of this PDF creator, pdf writer can be found on http://www.pdfpdf.com/pdf4u_pro.html More conversion examples on how to use this pdf converter can found on http://www.pdfpdf.com/faq.html