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Isn't Qubes just another Linux distribution after all? Well, if you really want to call it a distribution, then we're more of a "Xen distribution", rather then a Linux one. But Qubes is much more than just Xen packaging -- it has its own VM management infrastructure, with support for template VMs, centralized VM updating, etc, and also its very unique GUI virtualization infrastructure. What is the main concept behind Qubes? To build security on the "Security by Isolation" principle. Key architecture features:Based on a secure bare-metal hypervisor (Xen)Networking code sand-boxed in an unprivileged VM (using IOMMU/VT-d)No networking code in the privileged domain (dom0)All user applications run in "AppVMs", lightweight VMs based on LinuxCentralized updates of all AppVMs based on the same templateQubes GUI virtualization presents applications like if they were running locallyQubes GUI provides isolation between apps sharing the same desktopStorage drivers and backends sand-boxed in an unprivileged virtual machine(*)Secure system boot based on Intel TXT(*)

XPDF is an open source viewer for Portable Document Format (PDF) files. (These are also sometimes also called 'Acrobat' files, from the name of Adobe's PDF software.) The Xpdf project also includes a PDF text extractor, PDF-to-PostScript converter, and various other utilities. Xpdf runs under the X Window System on UNIX, VMS, and OS/2. The non-X components (pdftops, pdftotext, etc.) also run on Win32 systems