Jeff Boerer has a good find on this. It looks like Blackboard has filed a complaint with the U.S. International Trade Commission aleging that Desire2Learn is illegally importing software into the United States that violates a U.S. patent. I don’t know anything more than what Jeff has posted, so I recommend you go to his blog and read his post.
Disclaimer
The views expressed here are solely my own and do not necessarily reflect those of my employer.