darthcamaro writes: Ok, this is an obvious question right? It has to be GPL? No? Not necessarily. A new study released today at the OSBC shows a difference between what open source licenses are used and which ones are included in the top downloaded projects. 68.9 percent of open source software packages use the GPL, however measured by downloads the top open source license is the Apache License at 32.7 percent. The LGPL came in second at 21.0 percent and GPL is third at 14.4 percent.