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Professional Plone Development: Building robust, content-centric web applications with Plone 3, an open source Content Management System by Martin Aspeli

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Licensing

Most parts of Plone are licensed under the GNU General Public License (GPL) Version 2, with various components alternatively licensed under the Lesser General Public License (LGPL), MIT, and BSD licenses. You should seek qualified legal advice if you are concerned about the license.

In practical terms, the license means that you are free to modify and re-use parts of Plone for your own needs. However, if you build a custom application on top of Plone and you intend to distribute (e.g., sell a license for or a boxed version of) that application, you will need to distribute your source code as well. You do not need to make the source code available if you are simply deploying a solution on an internal server.

The Plone source code is legally ...

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