You wrote: > This question still remains: Can I listen and watch to RealAudio- and > RealVideo-files with completely free software, if I install only > RPSL-licenced software from Helix DNA?
There was a debian-legal thread about this already (see http://lists.debian.org/debian-legal/2002/debian-legal-200207/msg00448.html). The RPSL is not DFSG-free. Specifically, Branden Robinson said: "Clause 13.7 of the RPSL violates DFSG 5. It discriminates against people who are not under the jurisdiction of the United States government." And no, nobody can play RealAudio or RealVideo with Free Software. For audio, I suggest using Ogg Vorbis instead. For video Ogg Theora will probably become the Free Software alternative. See http://www.xiph.org/ for more info on the Ogg family of codecs.
