"A legal center is trying to overturn a patent it says threatens
three open-source educational projects, a sign of the tension
between patent holders and the collaborative programming
"The Software Freedom Law Center said Thursday that it has asked
the U.S. Patent Office to re-examine a patent awarded to education
software company Blackboard. It claims that the patent is bogus and
could undermine three open-source education software projects it
represents--Sakai, Moodle and ATutor..."