Ballmer attacks Linux on patent front

Microsoft CEO Steve Ballmer warned on Thursday that Linux may not really be free given the intellectual-property risks that could be posed by the open-source operating system.
Answering questions after a speech to government officials in Singapore, Ballmer noted that entities using Linux could be opening themselves up to intellectual-property litigation.
“There was a report out this summer by an open-source group that highlighted that Linux violates over 228 patents,” Ballmer said at the company’s Government Leaders Forum event.
Ballmer attacks Linux on patent front | CNET