The following licenses are considered both  popular and widely used as of September 2006, and thus we encourage new Open Source projects to use one of these (rather than writing your own) if at all possible. If one of these does not fit your needs, check the  complete list of OSI-approved licenses.

There are, of course, many factors which can go into choosing a license, so be sure to ask around and consider your larger business goals when selecting a license.

Permissive Licenses

Copyleft Licenses

Note that the following license are require that certain modification be redistributed under the original license, and thus may not be compatible with each other (depending on exactly how the code is combined).