||"A manager's guide to the business and organisational applications of open source technologies"
There are a huge number of open source and free software licenses. The table below summarizes five of the most important characteristics of some popular licences.
|Code usable in closed source project?||yes||yes||yes||no||yes?||yes||yes|
|May be sold?||yes||yes||yes||no||yes?||yes||yes|
|Modified code must be released?||no||no||no||yes||yes||yes||yes|
|Explicit patent license?||no||no||yes||no||no||yes||yes|
The "yes?" for LGPL are there to indicate that there is some legal doubt surrounding this. The information in this table is a summarized form of a Zdnet blog article by Ed Burnette "How to pick an open source license (part 2)".