ACTUALLY....

from the download aggrement : ( on my site and Knopper's )

IF YOU PLAN TO COMMERCIALLY USE OR DISTRIBUTE (AND SELL) THE SOFTWARE, YOU HAVE TO ACQUIRE THE NECESSARY LICENSES AND PERMISSIONS FROM ALL SOFTWARE COPYRIGHT HOLDERS OF NON-FREE SOFTWARE COMPONENTS, OR REMOVE THESE COMPONENTS BEFORE DISTRIBUTING THE SOFTWARE.
Reason being not everything is released under GPL. Some thing have different licences. I guess if non-free is in the sources list then the'll be problems. Some licences prohimit for-profit distribition. I guess it would be good to get a list of the non-free software on the cd.