For an outfit that calls itself “the world's largest business software company”, the German software giant SAP is relatively little-known in the open source world. With 51,500 employees, a turnover of 11.5 billion euros ($16 billion) last year, and operating profits of 2.7 billion euros ($3.8 billion), SAP is clearly one of the heavyweights in the computer world. Given that huge clout, SAP's attitude to open source is important; and yet it is hard to tell whether it is really free software's friend or its foe.