In the beginning, we did not base our work on dotLRN, as it mostly deals with community-tools and does not really have learning-objects. The only resources you can give to students are downloads.
Now that we have a system of integrated learning-objects (textbooks, exercises, exams, glossary, downloads, collections (sequenced groups of learning-objects)) we see dotLRN as the perfect supplement for course-management tasks.
In fact we are currently integrating our learning-object system with dotLRN. As far as the code-release under GPL is concerned, we have not spoken about that issue but i do not see a problem about it, so i hope it will be possible.
