Updates, Changes, Copying, Contact

Updates of this document can be found at http://(linux|unix).schottelius.org/decr-f/. If you want to submit changes, simply contact me with a diff -u to the original L^ATEX document. Copying the entire document without changes is allowed. You can contact me via e-mail at "`nico-decr-f@schottelius.org"'.