What's the most popular open source license currently in use? If you said GPL you would be right. But how did you know?
Plenty of people assume that GPL is the most commonly used because that's what a simple search of the SourceForge.net online repository brings up.
Now, licensing detection software vendor Black Duck is jumping into the fray by providing a public resource that includes the benefit of Black Duck' efforts detailing open source license usage.
"We have a spider group [with] manual and automated tools that has resulted in the knowledge base," Douglas Levin, president and CEO of Black Duck Software, told InternetNews.com . "Having a listing of the top open source licenses by usage is very useful for companies already in open source as well as those considering it."
http://www.internetnews.com/dev-news/article.php/3706631