Multiple roles in school learning systems – patent upheald

This claim made me wonder if there was any prior art in the Liberty work that might apply. Or if this would affect any identity system that allowed for multiple roles for people.
From Slashdot:

Blackboard, the dominant learning management system (LMS) maker, has won its initial suit against Desire2Learn. Blackboard gets $3.1 million and can demand that Desire2Learn stop US sales. (We discussed Blackboard when the patent was issued in 2006) This blog provides background on the suit. Blackboard has been granted a patent that covers a single person having multiple roles in an LMS: for example, a TA might be a student in one class and an instructor in another. You wouldn’t think something this obvious could even be patented, but so far it’s been a very effective weapon for Blackboard, badly hurting Desire2Learn and generating a huge amount of worry for the few remaining commercial LMSs that Blackboard has not already bought, and open source solutions such as Moodle (Blackboard’s pledge not to attack such providers notwithstanding).”