Now next question about Viruses: You are starting from the point that I will get viruses. Just by using Trados, an off line tool which is at the most checking another instance of a network because of licensing. How are you assuming that I could get that virus. You can stop altogether working on the BITS or on auto-updates on software. Can't you simply start by not allowing uncontrolled connexions to the Internet (like adding an offline-modus in winecfg instead on blocking the root)? The virus I got on Windows was per auto-upload, even with 2 firewalls, a router and an antivirus. The concerned software was refusing to open without being able to check the license online, thus one had to allow it. Someday it autoupdated with a virus. Don't you think the first concern would be no automatic download of executables? I don't think getting an answer about a license is an executable.