"There are a number of ways traditional software vendors can participate in the open source software community. They circulate around open source licenses, such as the GNU General Public License (GPL), and how to leverage open source software as a marketing tool.
"A sophisticated marketing application of the GPL is the dual license. The dual-license approach is not typically one integrated license. It is a business policy that permits a customer to choose one of two licenses: either a typical commercial license or an open source license such as the GPL..."
