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Corbet: "75% of Linux code written by paid developers"

The title of the article is one of the phrases that one of the founders of LWN.net and kernel contributor Jonathan Corbet

delivered during a presentation at Linux.conf.au

2010 held in Wellington (New Zealand)
• after an analysis of code written for the Linux kernel over time between December 2008 and January 2010. The period analyzed is the one that has seen the 'evolution of the kernel from version 2.6.28
• to 2.6.32 , with 2.8 million lines of code written and thousands of changes.
  

L ' complete article provides interesting data on the subject.