Here is what Robert Fadel, OLPC director of finance and operations, said in an article published by PCWorld:
OLPC released a statement, saying it has not yet seen the legal filings in the case. "OLPC has the utmost respect for the rights of intellectual property owners," Robert Fadel, OLPC director of finance and operations, said in the statement. "To OLPC's knowledge, all of the intellectual property used in the XO Laptop is either owned by OLPC or properly licensed. Until we have a copy of the claim and have had time to review it, we will not be commenting further on the matter."
I think the people at OLPC have not read all the software patents granted by the USPTO, or the EPO, or even other patent offices around the world.