Clearly defines licensing standards - great reference

Software licensing can be one of the most confusing issues of software installation and development. Most people assume that there are few if any issues with Open Source and Free Software Licensing but that often is not the case. While it may be free to install you wade into murky waters when you change the code, make a new program that uses some of the coding of the open source program, make a derivative program, or a host of other situations. Part of the confusion is that all Open Source or Free Software licensing is not the same. For example there are the MIT, BSD, Apache, and Academic Free Licenses. Or what about the GNU license? Most people don't realize that there are two different versions of GNU licenses, the GNU General Public License (GPL) and the GNU Lesser General Public License (LGPL)? Then there is the Mozilla Public License, Q Public License, Artistic License, and Creative Commons License.

Author Andrew M. St. Laurent does an excellent job explaining all these various licenses, what you can do and can't do, the various benefits and shortcomings of the licenses and pitfalls to watch for. If you are doing development in this arena, have made an improvement to one of the programs, or have written a program for internal use that might have resell value you can't afford to not understand the nuances of the various licensing agreements. Understanding Open Source & Free Software Licensing is highly recommended and required reading for anyone in this situation.

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• Clearly defines licensing standards - great reference