I know the general format for package names in Debian and Ubuntu. Some packages have additions to the standard numbering scheme with obvious meaning like
svn20090426 etc. But also quite a few packages have dsfg in their name (e.g.
2:1.0~rc4~try1.dsfg1-1ubuntu1) – what does that mean?
Is it just a typo of the Debian Free Software Guidelines (DFSG)?
A package with 'dfsg'/'dsfg' suffix is one that has been stripped of any files that doesn't follow the Debian Free Software Guidelines.
(From Debian mailing list: http://lists.debian.org/debian-mentors/2010/08/msg00169.html)