Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
A couple of years ago, I took over the maintenance of the syslinux package since its previous maintainer was MIA. The takeover was motivated by to the fact, that having started to take care about live systems, I also started to use syslinux on a daily basis and that the syslinux package in Debian was horribly outdated.
Since syslinux version 3.71 is present in testing/lenny as well as unstable/sid, and stable/etch has version 3.31, that means... if debian-cd is embedding a syslinux binary with a different version, it must contain the sources for it (it also needs to contain the sources for it anyway, even if it would embedd binaries of the current version, however, it would be a tiny bit less arguable if its sources would be at least present in the Debian archive). So I checked debian-cd, and surprise, it doesn't contain syslinux sources.
Syslinux is licensed under the GNU General Public License, version 2 or later.