Here are some example cases that have ended up to courts of law [linksys][busybox][fortinet][vmware]. [linksys] http://tinyurl.com/l9zd7qo [busybox] http://arstechnica.com/information-technology/2010/08/court-... [fortinet] http://gpl-violations.org/news/20050414-fortinet/ [vmware] https://sfconservancy.org/copyleft-compliance/vmware-lawsuit...