PDF4U creates PDF files from any Windows application running on Windows 7, Windows Vista, Windows 2000, Windows XP, Windows Server 2003 and Windows Server 2008. 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. This PDF4U Terminal Server Edition is designed for applications in a multi-user server environment including Microsoft Windows Server, Citrix Server, Web Server, Oracle Server and Report Servers.