IBM has been at it for a long time. It has been notorious for earning through licensing of it's patents http://www.ipwatchdog.com/2012/01/11/ibms-formula-for-succes...

Tangentially related: my day job involves cleaning up patent data, and IBM can't spell its own name consistently: there are thousands of unique variations of IBM as an assignee name, far dominating all other US and european patent holders.