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A Developer's Broadsheet

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I'm working on a more serious, commercialesque website and wish to incorporate some open source GPL libraries, so I've been trying to figure out the implications. This from the Wikipedia entry on GPL:

Note that the copyleft only applies to the software and not to its output (unless that output is itself a derivative work of the program); for example, a web portal running a modified GPL content management system is not required to distribute its changes to the underlying software. (It has been suggested that this be changed for version 3 of the GPL.)

From the horse's mouth: GNU General Public License v2.0

keywords: GNU, licensing, open source